GUVI Biblio





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Found 1868 entries in the Bibliography.


Showing entries from 151 through 200


2020

Ionospheric response to the 25-26 August 2018 intense geomagnetic storm

Vaishnav, Rajesh; Jacobi, Christoph;

Published by:       Published on:

YEAR: 2020     DOI:

The atmosphere below 200 km over Norilsk at solar minimum and maximum

Yakovleva, OE; Kushnarenko, GP; Kuznetsova, GM;

Published by: Solar-Terrestrial Physics      Published on:

YEAR: 2020     DOI:

Effect of solar flux versus compositional variations on the variability of daytime oxygen optical emission rates over low-and mid-latitudes

Pallamraju, Duggirala; Karan, Deepak; Laskar, Fazlul; Lakshmi, Vijaya; Chakrabarti, Supriya;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on:

YEAR: 2020     DOI:

Variations of lower thermospheric FUV emissions based on GOLD observations and GLOW modeling

Greer, KR; Eastes, Richard; Solomon, Stan; McClintock, William; Burns, Alan; Rusch, David;

Published by: Journal of Geophysical Research: Space Physics      Published on:

YEAR: 2020     DOI:

Modeled IMF By effects on the polar ionosphere and thermosphere coupling

Liu, Jing; Burns, Alan; Wang, Wenbin; Zhang, Yongliang;

Published by: Journal of Geophysical Research: Space Physics      Published on:

YEAR: 2020     DOI:

2019

Dayside Aurora

Dayside aurora is related to processes in the dayside magnetosphere and especially at the dayside magnetopause. A number of dayside aurora phenomena are driven by reconnection between the solar wind interplanetary magnetic field and the Earth\textquoterights internal magnetic field at the magnetopause. We summarize the properties and origin of aurora at the cusp foot point, High Latitude Dayside Aurora (HiLDA), Poleward Moving Auroral Forms (PMAFs), aurora related to traveling convection vortices (TCV), and throat aurora. ...

Frey, Harald; Han, Desheng; Kataoka, Ryuho; Lessard, Marc; Milan, Stephen; Nishimura, Yukitoshi; Strangeway, Robert; Zou, Ying;

Published by: Space Science Reviews      Published on: 11/2019

YEAR: 2019     DOI: 10.1007/s11214-019-0617-7

The dependence of four-peak longitudinal structure of the tropical electric field on the processes in the lower atmosphere and geomagnetic field configuration

Klimenko, V.V.; Klimenko, M.V.; Bessarab, F.S.; Sukhodolov, T.V.; Rozanov, E.V.;

Published by: Advances in Space Research      Published on: 11/2019

YEAR: 2019     DOI: 10.1016/j.asr.2019.06.029

Effects of the interplanetary magnetic field y component on the dayside aurora

A dawn\textendashdusk asymmetry in many high-latitude ionospheric and magnetospheric phenomena, including the aurora, can be linked to the east\textendashwest (y) component of the interplanetary magnetic field (IMF). Owing to the scarcity of observations in the Southern Hemisphere, most of the previous findings are associated with the Northern Hemisphere. It has long been suspected that if the IMF By component also produces a dawn\textendashdusk asymmetry and/or a mirror image in the ...

Liou, K.; Mitchell, E.;

Published by: Geoscience Letters      Published on: 11/2019

YEAR: 2019     DOI: 10.1186/s40562-019-0141-3

Radiative cooling due to NO at 5.3

The effect of geomagnetic storms on the peak emission of NO Volume Emission Rate (NO VER) at 5.3 m, in mesosphere and lower thermosphere (MLT) region, is studied over the Asian sector during 26\textendash29 September 2011 (storm 1) and 18\textendash21 February 2014 (storm 2). The data for peak emission of NO VER is obtained from SABER instrument onboard the NASA\textquoterights TIMED satellite. The SABER retrieved data along with the neutral densities obtained from NRLMSISE-00 model have been used to study the latitudinal ...

Bharti, Gaurav; Krishna, M.V.; Singh, Vir;

Published by: Advances in Space Research      Published on: 11/2019

YEAR: 2019     DOI: 10.1016/j.asr.2019.07.016

Characteristics of GNSS total electron content enhancements over the mid-latitudes during a geomagnetic storm on November 7 and 8, 2004

The characteristics of global electron density variations in the ionosphere during a geomagnetic storm on November 7 and 8, 2004, were investigated using total electron content (TEC) obtained from the global navigation satellite system (GNSS). The regions of enhanced TEC over North America, Europe, and Japan first appeared in the mid-latitude regions. The TEC enhancements over North America showed a rapid longitudinal expansion and reached a wide longitudinal extent during the initial and main phases of the geomagnetic st ...

Sori, T.; Shinbori, A.; Otsuka, Y.; Tsugawa, T.; Nishioka, M.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 10/2019

YEAR: 2019     DOI: 10.1029/2019JA026713

Conjugate hemispheric response of earth\textquoterights ionosphere due to geomagnetic storms occurred during two equinox periods

The ionospheric response of two geomagnetic storms of 2016 occurred during spring equinox (5-8 March, 2016) and autumn equinox (12-15 October, 2016) is investigated using the total electron content (TEC) data derived from Global Positioning System (GPS) receivers located in the equatorial ionization anomaly (EIA) crest regions at northern hemisphere (Tripura University, Agartala, India) and southern hemisphere (Karratha, Australia). While in southern EIA station ionospheric responses for the two storms are found to be sym ...

Patari, Arup; De, Barin; Guha, Anirban; Paul, Bapan;

Published by: Journal of Physics: Conference Series      Published on: 10/2019

YEAR: 2019     DOI: 10.1088/1742-6596/1330/1/012004

Effects of CME and CIR induced geomagnetic storms on low-latitude ionization over Indian longitudes in terms of neutral dynamics

This paper presents the response of the ionosphere during the intense geomagnetic storms of October 12\textendash20, 2016 and May 26\textendash31, 2017 which occurred during the declining phase of the solar cycle 24. Total Electron Content (TEC) from GPS measured at Indore, Calcutta and Siliguri having geomagnetic dips varying from 32.23\textdegreeN, 32\textdegreeN and 39.49\textdegreeN respectively and at the International GNSS Service (IGS) stations at Lucknow (beyond anomaly crest), Hyderabad (between geomagnetic equat ...

Chakraborty, S.; Ray, S.; Sur, D.; Datta, A.; Paul, A.;

Published by: Advances in Space Research      Published on: 10/2019

YEAR: 2019     DOI: 10.1016/j.asr.2019.09.047

Isolated Auroral Spots Observed by DMSP/SSUSI

This work reports auroral spots event observed by the SSUSI instruments on board the DMSP spacecraft between 22 and 23 July 2009 during the recovery phase of a moderate magnetic storm. The spots were observed between 18:00 and 02:00 magnetic local time and stayed at ~60\textdegree magnetic latitude. They lasted for ~10 hr and corotated with ~64\% of the Earth\textquoterights rotational speed. In situ observations indicate that the isolated auroral spots were produced by energetic ions at energies between 10 and 240 keV, w ...

Zhou, Su; Luan, Xiaoli; Pierrard, Viviane; Han, Desheng;

Published by: Journal of Geophysical Research: Space Physics      Published on: 10/2019

YEAR: 2019     DOI: 10.1029/2019JA026853

Morphological study on the ionospheric variability at Bharati, a polar cusp station in the southern hemisphere

Morphological features of the quiet/disturbed time variations in the Total Electron Content (TEC) at the polar cusp station Bharati (76.69\textdegreeS MLAT) during a period of 5 years starting from February 2013 to December 2017 has been studied using GPS TEC measurements. The TEC at Bharati follows a diurnal pattern with its peak appearing close to local noon/magnetic noon during the summer/winter months. A nighttime enhancement in the TEC is seen around the magnetic midnight during winter. The plasma density at Bharati ...

Shreedevi, P.R.; Choudhary, R.K.; Yu, Yiqun; Thomas, Evan;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: 10/2019

YEAR: 2019     DOI: 10.1016/j.jastp.2019.105058

A new method for deriving the nightside thermospheric density based on GUVI dayside limb observations

We propose a new method to derive the nightside thermsopheric density by extending GUVI dayside limb observations using empirical orthogonal function (EOF) analysis. First, we acquire the GUVI dayside total mass density during 2002-2005 to construct a preliminary empirical model (EM). Simultaneously, we decompose the background thermospheric density from US Naval Research Laboratory Mass Spectrometer and Incoherent Scatter Radar Extended (NRLMSISE-00) model into different empirical orthogonal functions (EOFs). The decompo ...

Yu, Tingting; Ren, Zhipeng; Yu, You; Wan, Weixing;

Published by: Space Weather      Published on: 10/2019

YEAR: 2019     DOI: 10.1029/2019SW002304

Quantification of the vertical transport and escape of atomic hydrogen in the terrestrial upper atmosphere

Measurements of the limiting escape rate of atomic hydrogen (H) atoms at Earth, and the relative significance of thermal evaporation and non-thermal escape mechanisms, such as charge exchange and polar wind, have long been lacking. Our recent development of sophisticated radiative transport analysis techniques now enables the reliable interpretation of remotely-sensed measurements of optically-thick H emission, such as those acquired along the Earth\textquoterights limb by the Global Ultraviolet Imager (GUVI) onboard the ...

Joshi, P.P.; Phal, Y.D.; Waldrop, L.S.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 10/2019

YEAR: 2019     DOI: 10.1029/2019JA027057

Response of the Earth\textquoterights equatorial ionosphere during the severe G4-class geomagnetic storm of 8 th September 2017

Equatorial and low latitude ionospheric response of the 8th September 2017 severe G4-class geomagnetic storm is investigated using the total electron content (TEC) data from a longitudinal chain of global positioning system (GPS) receivers over Asian, African and American sectors. During the main phase, a positive storm effect is observed over Asian sector, a complete negative storm effect over African sector and both are observed over American sector. A sharp increase in peak TEC is observed over the complete ...

Paul, Bapan; Patari, Arup; De, Barin; Guha, Anirban;

Published by: Journal of Physics: Conference Series      Published on: 10/2019

YEAR: 2019     DOI: 10.1088/1742-6596/1330/1/012005

Understanding the global dynamics of the equatorial ionosphere in Africa for space weather capabilities: A science case for AfrequaMARN

Lawal, Hammed; Lester, Mark; Cowley, Stanley; Milan, S.E.; Yeoman, T.K.; Provan, Gabby; Imber, Suzie; Rabiu, A.Babatunde;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: 10/2019

YEAR: 2019     DOI: 10.1016/j.jastp.2018.01.008

Upper Atmosphere Radiance Data Assimilation: A Feasibility Study for GOLD Far Ultraviolet Observations

Far ultraviolet observations of Earth\textquoterights dayglow from the National Aeronautics and Space Administration (NASA) Global-scale Observations of the Limb and Disk (GOLD) mission presents an unparalleled opportunity for upper atmosphere radiance data assimilation. Assimilation of the Lyman-Birge-Hopfield (LBH) band emissions can be formulated in a similar fashion to lower atmosphere radiance data assimilation approaches. To provide a proof-of-concept for such an approach, this paper presents assimilation experiment ...

Cantrall, Clayton; Matsuo, Tomoko; Solomon, Stanley;

Published by: Journal of Geophysical Research: Space Physics      Published on: 10/2019

YEAR: 2019     DOI: 10.1029/2019JA026910

Effects on the equatorial and low latitude thermosphere and ionosphere during the 19\textendash22 December 2015 geomagnetic storm period

In this paper, the critical frequency of F2 layer (foF2) and their peak height (hmF2) recorded at equatorial and low latitude stations of the South American sector were analyzed during the 19\textendash22 December 2015 geomagnetic storm period. We have observed initially decreases of foF2 at equatorial and low latitudes over the North crest of the equatorial ionization anomaly (EIA) and almost no effect over the South crest. These initial negative storm effects can be fully explained by the penetration of a westward elect ...

Mansilla, G.A.; Zossi, M.M.;

Published by: Advances in Space Research      Published on: 09/2019

YEAR: 2019     DOI: 10.1016/j.asr.2019.09.025

Time-Dependent Response of the Terrestrial Exosphere to a Geomagnetic Storm

Recent observations of significant enhancements in exospheric hydrogen (H) emission in response to geomagnetic storms have been difficult to interpret in terms of the evolution of the underlying global, 3-D exospheric structure. In this letter, we report the first measurement of the timescales and spatial gradients associated with the exospheric response to a geomagnetic storm, which we derive from a novel, time-dependent tomographic analysis of H emission data. We find that global H density at 3 RE be ...

Cucho-Padin, Gonzalo; Waldrop, Lara;

Published by: Geophysical Research Letters      Published on: 09/2019

YEAR: 2019     DOI: 10.1029/2019GL084327

Global-Scale Observations of the Equatorial Ionization Anomaly

The National Aeronautics and Space Administration Global-scale Observations of the Limb and Disk ultraviolet spectrograph has been imaging the equatorial ionization anomaly (EIA), regions of the ionosphere with enhanced electron density north and south of the magnetic equator, since October 2018. The initial 3 months of observations was during solar minimum conditions, and they included observations in December solstice of unanticipated variability and depleted regions. Depletions are seen on most nights, in contrast to e ...

Eastes, R.; Solomon, S.; Daniell, R.; Anderson, D.; Burns, A.; England, S.; Martinis, C.; McClintock, W.;

Published by: Geophysical Research Letters      Published on: 08/2019

YEAR: 2019     DOI: 10.1029/2019GL084199

Ionospheric parameters in the European sector during the magnetic storm of August 25\textendash26, 2018

Variations of ionospheric parameters Total Electron Content (TEC) by GNSS, critical frequency (foF2) by vertical sounding and electron density (Ne) by low-altitude satellite were studied at high, mid and low latitudes of the European sector during the magnetic storm of August 25\textendash26, 2018. During the main phase of the storm the ionospheric F2-layer was under the positive disturbance at mid and low latitudes. Then the transition from the positive to negative ΔfoF2 values occurred at all latitudes. The recovery ph ...

Blagoveshchensky, D.V.; Sergeeva, M.A.;

Published by: Advances in Space Research      Published on: 08/2019

YEAR: 2019     DOI: 10.1016/j.asr.2019.07.044

The OI-135.6~nm Nighttime Emission in ICON-FUV Images: A New Tool for the Observation of Classical Medium-Scale Traveling Ionospheric Disturbances?

The National Aeronautics and Space Administration Ionospheric Connection Explorer (ICON) mission will study the close relationship between the ionosphere, the atmospheric weather, and space weather using in situ and remote sensing instruments proving plasma density, temperature, ion drift velocity, and thermospheric wind velocity over the equatorial region. In particular, the far ultraviolet (FUV) instrument will image the terrestrial limb in two wavelength channels. During nighttime, only the channel characterizing the b ...

Wautelet, G.; Hubert, B.; erard, J.-C.; Immel, T.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 08/2019

YEAR: 2019     DOI: 10.1029/2019JA026930

New Aspects of the Ionospheric Behavior Over Millstone Hill During the 30-Day Incoherent Scatter Radar Experiment in October 2002

The geomagnetic storm-driven ionospheric changes and the involved processes are interesting and challenging topics in understanding and predicting the ionosphere. In this study we investigate the response of the ionosphere to geomagnetic disturbances during the 30-day incoherent scatter radar measurements conducted at Millstone Hill (42.6\textdegreeN, 71.5\textdegreeW) from 4 October to 4 November 2002. During geomagnetically disturbed periods, while the peak electron density of the F2 layer (NmF2) and total electron cont ...

Liu, Libo; Le, Huijun; Chen, Yiding; Zhang, Ruilong; Wan, Weixing; Zhang, Shun-Rong;

Published by: Journal of Geophysical Research: Space Physics      Published on: 07/2019

YEAR: 2019     DOI: 10.1029/2019JA026806

An Opposite Response of the Low-Latitude Ionosphere at Asian and American Sectors During Storm Recovery Phases: Drivers From Below or Above

n this study, we focus on the recovery phase of a geomagnetic storm that happened on 6\textendash11 September 2017. The ground-based total electron content data, as well as the F region in situ electron density, measured by the Swarm satellites show an interesting feature, revealing at low and equatorial latitudes on the dayside ionosphere prominent positive and negative responses at the Asian and American longitudinal sectors, respectively. The global distribution of thermospheric O/N2 ratio measured ...

Xiong, Chao; Lühr, Hermann; Yamazaki, Yosuke;

Published by: Journal of Geophysical Research: Space Physics      Published on: 07/2019

YEAR: 2019     DOI: 10.1029/2019JA026917

Response of ionosphere over Korea and adjacent areas to 17 March 2015 geomagnetic storm

Mengist, Chalachew;

Published by: Advances in Space Research      Published on: 07/2019

YEAR: 2019     DOI: 10.1016/j.asr.2019.03.038

Assimilation of Multiple Data Types to a Regional Ionosphere Model With a 3D-Var Algorithm (IDA4D)

For the purpose of building a regional (bound 20\textendash60\textdegreeN in latitude and 110\textendash160\textdegreeE in longitude) ionospheric nowcast model, we investigated the performance of IDA4D (Ionospheric Data Assimilation Four-Dimension) technique considering International Reference Ionosphere model as the background. The data utilized in assimilation were slant total electron content (STEC) from 27 ground GPS (Global Positioning System) receiver stations and NmF2 (ionospheric F2 peak density) from five ionoson ...

Mengist, Chalachew; Ssessanga, Nicholas; Jeong, Se-Heon; Kim, Jeong-Heon; Kim, Yong; Kwak, Young-Sil;

Published by: Space Weather      Published on: 06/2019

YEAR: 2019     DOI: 10.1029/2019SW002159

Deriving Thermospheric Temperature From Observations by the Global Ultraviolet Imager on the Thermosphere Ionosphere Mesosphere Energetics and Dynamics Satellite

This paper reports a preliminary result for estimating thermospheric temperature around 155 km from the N2 Lyman-Birge-Hopfield bands observed by TIMED/Global Ultraviolet Imager (GUVI). Atmospheric Ultraviolet Radiance Integrated Code model (Strickland et al., 1999, https://doi.org/10.1016/S0022-4073(98)00098-3) calculations indicate that the intensity ratio in the N2 Lyman-Birge-Hopfield (0,0) and (1,0) bands at 144.5- ...

Zhang, Yongliang; Paxton, Larry; Schaefer, Robert;

Published by: Journal of Geophysical Research: Space Physics      Published on: 06/2019

YEAR: 2019     DOI: 10.1029/2018JA026379

Imaging of the Daytime Ionospheric Equatorial Arcs With Extreme and Far Ultraviolet Airglow

We present the first global images of the daytime ionosphere equatorial arcs as manifested in the 83.4-nm airglow. These images were collected by the Limb-Imaging Ionospheric and Thermospheric Extreme-Ultraviolet Spectrograph that commenced operations on the International Space Station in early 2017. We compare these to simultaneous images of the ionospheric radiative recombination airglow at 135.6 nm measured between 250- and 350-km tangent altitudes, where the emission is generated primarily by radiative recombination o ...

Stephan, A.; Finn, S.; Cook, T.; Geddes, G.; Chakrabarti, S.; Budzien, S.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 06/2019

YEAR: 2019     DOI: 10.1029/2019JA026624

Ionospheric disturbances at low and mid-low latitudes of the South American sector during the March 2015 great storm

Mansilla, Gustavo;

Published by: Advances in Space Research      Published on: 06/2019

YEAR: 2019     DOI: 10.1016/j.asr.2019.02.009

Signatures of Sudden Storm Commencement on the equatorial thermospheric dayglow

It has been observed that the OI 630.0\ nm dayglow emission over a dip equatorial station, Trivandrum (8.5\textdegree\ N, 77\textdegree\ E, dip 0.5\textdegree\ N), India registered an abrupt increase of\ ~\ 2000\ R during the compression phase of the magnetosphere as dictated by a sudden increase in solar wind ram pressure. Furthermore, an unusual depletion of these emissions has been observed during the eastward interplanetary electric field (IEF), concomitant with southward excursion o ...

Sumod, Sukumarn; Pant, Tarun; Ajesh, Asokan;

Published by: Journal of Space Weather and Space Climate      Published on: 06/2019

YEAR: 2019     DOI: 10.1051/swsc/2019026

Wide-field auroral imager onboard the Fengyun satellite

The newly launched Fengyun-3D (FY-3D) satellite carried a wide-field auroral imager (WAI) that was developed by Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences (CIOMP), which will provide a large field of view (FOV), high spatial resolution, and broadband ultraviolet images of the aurora and the ionosphere by imaging the N2 LBH bands of emissions. The WAI consists of two identical cameras, each with an FOV of 68\textdegree in the along-track direction and 10\textdegree in ...

Zhang, Xiao-Xin; Chen, Bo; He, Fei; Song, Ke-Fei; He, Ling-Ping; Liu, Shi-Jie; Guo, Quan-Feng; Li, Jia-Wei; Wang, Xiao-Dong; Zhang, Hong-Ji; Wang, Hai-Feng; Han, Zhen-Wei; Sun, Liang; Zhang, Pei-Jie; Dai, Shuang; Ding, Guang-Xing; Chen, Li-Heng; Wang, Zhong-Su; Shi, Guang-Wei; Zhang, Xin; Yu, Chao; Yang, Zhong-Dong; Zhang, Peng; Wang, Jin-Song;

Published by: Light: Science \& Applications      Published on: 05/2019

YEAR: 2019     DOI: 10.1038/s41377-019-0157-7

Annual and Semiannual Oscillations of Thermospheric Composition in TIMED/GUVI Limb Measurements

The Global UltraViolet Imager (GUVI) onboard the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite provides a data set of vertical thermospheric composition (O, N2, and O2 densities) and temperature profiles from 2002\textendash2007. Even though GUVI sampling is limited by orbital constraint, we demonstrated that the GUVI data set can be used to derive the altitude profiles of the amplitudes and phases of annual oscillation (AO) and semiannual oscillation (SAO), thereby pro ...

Yue, Jia; Jian, Yongxiao; Wang, Wenbin; Meier, R.R.; Burns, Alan; Qian, Liying; Jones, M.; Wu, Dong; Mlynczak, Martin;

Published by: Journal of Geophysical Research: Space Physics      Published on: 04/2019

YEAR: 2019     DOI: 10.1029/2019JA026544

Seasonal Variations of Low-Latitude Migrating and Nonmigrating Diurnal and Semidiurnal Tides in TIMED-SABER Temperature and Their Relationship With Source Variations

Seasonal and source variations of migrating and nonmigrating tides are studied using Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics-Sounding of the Atmosphere using Broadband Emission Radiometry temperature data at 10\textdegreeN (5\textendash15\textdegreeN) for the year 2009. The migrating DW1 shows equinoctial maximum and summer minimum at low latitudes. It shows equinoctial asymmetry with larger amplitudes during spring equinox than fall equinox. The migrating semidiurnal tidal amplitude (SW2) shows larger ...

Sridharan, S.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 04/2019

YEAR: 2019     DOI: 10.1029/2018JA026190

Comparison of Thermospheric Density Between GUVI Dayside Limb Data and CHAMP Satellite Observations: Based on Empirical Model

The Global Ultraviolet Imager (GUVI) aboard the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite senses far ultraviolet airglow emissions in the thermosphere. The retrieved altitude profiles of thermospheric neutral density from GUVI daytime limb scans are significant for ionosphere-thermosphere study. Here, we use the profiles of the main neutral density to derive the total mass density during the period 2002\textendash2007 under geomagnetic quiet conditions (ap\ \<\ =12) ...

Yu, Tingting; Ren, Zhipeng; Yue, Xinan; Yu, You; Wan, Weixing;

Published by: Journal of Geophysical Research: Space Physics      Published on: 03/2019

YEAR: 2019     DOI: 10.1029/2018JA026229

Evaluation of Space Traffic Effects in SBUV Polar Mesospheric Cloud Data

Water-rich rocket exhaust plumes, in particular those emitted by the National Aeronautics and Space Administration Space Shuttle, have been suggested to make a significant contribution to long-term trends in polar mesospheric cloud (PMC) ice water content. We investigate this claim using the combined Solar Backscatter Ultraviolet (SBUV) PMC data record from eight separate instruments, which includes 60 Shuttle launches during PMC seasons between 1985 and 2011. No statistically significant postlaunch signal in PMC total ic ...

DeLand, Matthew; Thomas, Gary;

Published by: Journal of Geophysical Research: Atmospheres      Published on: 03/2019

YEAR: 2019     DOI: 10.1029/2018JD029756

Inferring thermospheric composition from ionogram profiles: A calibration with the TIMED spacecraft

Measurements of thermospheric composition via ground-based instrumentation are challenging to make and so details about this important region of the upper atmosphere are currently sparse. We present a technique thatdeducesquantitative estimates of thermospheric composition from ionospheric data, for which there is a global network of stations. The visibility of the F1 peak in ionospheric soundings from ground-based instrumentation is a sensitive function of thermospheric composition. The ionospheric profile in the transit ...

Scott, Christopher; Jones, Shannon; Barnard, Luke;

Published by: Annales Geophysicae Discussions      Published on: 03/2019

YEAR: 2019     DOI: 10.5194/angeo-2019-4710.5194/angeo-2019-47-RC110.5194/angeo-2019-47-RC2

L-band scintillation and TEC variations on St. Patrick\textquoterights Day storm of 17 March 2015 over Indian longitudes using GPS and GLONASS observations

The aim of the present study is to investigate the response of ionospheric total electron content (TEC), Global Positioning System (GPS) and Global Navigation Satellite System (GLONASS) scintillations during 17 March 2015 St. Patrick\textquoterights Day geomagnetic storm over Visakhapatnam, which is popularly known as Waltair (WALT) in the literature. GPS TEC observations obtained from five IGS stations (SGOC, IISC, HYDE, LCK4 and LHAZ) and WALT during the storm have been compared. The TEC derived from GPS, GLONASS conste ...

Srinivasu, K; Prasad, D; Niranjan, K; Seemala, Gopi; Venkatesh, K;

Published by: Journal of Earth System Science      Published on: 03/2019

YEAR: 2019     DOI: 10.1007/s12040-019-1097-6

An Observational Review on influence of Intense Geomagnetic Storm on Positional Accuracy of NavIC/IRNSS System

The positional accuracy of Navigation with the Indian Constellation (NavIC)/Indian Regional Navigation Satellite System (IRNSS) in the low latitudes of the Indian region during the intense geomagnetic storm of 8 September 2017 being reported first time. The existence of an intense geomagnetic storm is verified with several geomagnetic indices and interplanetary field parameters. The Total Electron Content (TEC) maps from the International GNSS Service (IGS) data and the thermosphere O/N2 ratio maps from the Global Ultra V ...

Desai, Mehul; Shah, Shweta;

Published by: IETE Technical Review      Published on: 03/2019

YEAR: 2019     DOI: 10.1080/02564602.2019.1599739

Observations of conjugated ring current auroras at subauroral latitudes

We report three ring current aurora events that are conjugated in the two hemispheres observed by satellite and ground imagers on May 16, 2005, August 26, 2018 and September 5, 2005. The ring current auroras appeared as auroral spots or arcs in the day, dusk or night side. These events confirm that the particle sources are in the equatoria ...

Zhang, Yongliang; Paxton, Larry;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: 03/2019

YEAR: 2019     DOI: 10.1016/j.jastp.2019.01.005

Plasma Blobs Associated With Medium-Scale Traveling Ionospheric Disturbances

Plasma blobs represent plasma density enhancements with respect to ambient plasma. The formation of blobs in low and middle latitudes is understood in association with either equatorial plasma bubbles or medium-scale traveling ionospheric disturbances (MSTIDs). This study reports four blob events identified from the Swarm satellite observations in 2014. Those blobs show the conjugate property and the alignment in the northwest-southeast direction in the Northern Hemisphere and southwest-northeast direction in the Southern ...

Kil, Hyosub; Paxton, Larry; Jee, Geonhwa; Nikoukar, Romina;

Published by: Geophysical Research Letters      Published on: 03/2019

YEAR: 2019     DOI: 10.1029/2019GL082026

Plasma transport process in the equatorial/low-latitude ionosphere

The behaviour of the equatorial/low-latitude ionosphere and the transport processes during magnetic disturbed and quiet periods of a high solar activity year, 2014, in the American sector are investigated. Parameters used include vertical drift (Vz), transport term (W), NmF2, hmF2 and scale-height (H). The F2 plasma variations followed the diurnal local solar pattern, being higher at daytime. The sunset maximum and sunrise minimum peaks of hmF2 were directly opposite to the scale height ...

Adebesin, Babatunde; Adekoya, Bolarinwa; David, Timothy;

Published by: Advances in Space Research      Published on: 03/2019

YEAR: 2019     DOI: 10.1016/j.asr.2018.11.013

Hemispheric Asymmetry of the Premidnight Aurora Associated With the Dawn-Dusk Component of the Interplanetary Magnetic Field

It has been known for decades that the nightside aurora in the Northern Hemisphere (NH) tends to be brighter when the interplanetary magnetic field (IMF) measured at Earth has a dawnward (negative y) component compared to a duskward (positive y) component. This asymmetric response to the polarity of IMF By has been explained by an interhemispheric current flowing out of the NH due to a nonuniform \textquotedblleftpenetration\textquotedblright of IMF By< ...

Liou, K.; Mitchell, E.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 02/2019

YEAR: 2019     DOI: 10.1029/2018JA025953

Spatial asymmetry in topside ion density and vertical E \texttimes B plasma drift velocity within 75\textdegreeE\textendash95\textdegreeE

The ion density measured by the Ionospheric Plasma and Electrodynamics Instrument (IPEI) on board the ROCSAT -1 over the 75\textdegreeE and ...

Kakoty, Rimpy; Bora, Saradi; Bhuyan, Pradip;

Published by: Advances in Space Research      Published on: 02/2019

YEAR: 2019     DOI: 10.1016/j.asr.2018.10.013

Impact of nitric oxide, solar EUV and particle precipitation on thermospheric density decrease

Zhang, Yongliang; Paxton, Larry; Lu, Gang; Yee, Sam;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: 01/2019

YEAR: 2019     DOI: 10.1016/j.jastp.2018.11.016

Longitudinal variations of the ionospheric trough position

For the first time a comprehensive pattern of the longitudinal effect of the ionospheric trough position was obtained. We present new results with longitudinal variations of the winter trough position as a function of geomagnetic latitude for both hemispheres and conditions of high and low solar activity and all local time hours. We used a large observational data set obtained onboard the Kosmos-900, Interkosmos-19 and CHAMP satellites for quiet geomagnetic conditions. We found that a magnitude of the trough position long ...

Karpachev, A.T.; Klimenko, M.V.; Klimenko, V.V.;

Published by: Advances in Space Research      Published on: 01/2019

YEAR: 2019     DOI: 10.1016/j.asr.2018.09.038

Space Weather Modeling Capabilities Assessment: Auroral Precipitation and High-Latitude Ionospheric Electrodynamics

As part of its International Capabilities Assessment effort, the Community Coordinated Modeling Center initiated several working teams, one of which is focused on the validation of models and methods for determining auroral electrodynamic parameters, including particle precipitation, conductivities, electric fields, neutral density and winds, currents, Joule heating, auroral boundaries, and ion outflow. Auroral electrodynamic properties are needed as input to space weather models, to test and validate the accuracy of phys ...

Robinson, Robert; Zhang, Yongliang; Garcia-Sage, Katherine; Fang, Xiaohua; Verkhoglyadova, Olga; Ngwira, Chigomezyo; Bingham, Suzy; Kosar, Burcu; Zheng, Yihua; Kaeppler, Stephen; Liemohn, Michael; Weygand, James; Crowley, Geoffrey; Merkin, Viacheslav; McGranaghan, Ryan; Mannucci, Anthony;

Published by: Space Weather      Published on: 01/2019

YEAR: 2019     DOI: 10.1029/2018SW002127

Addressing O2R with the SSUSI Operational Space Sensor: Lessons Learned

Schaefer, Robert; Paxton, Larry; Romeo, Giuseppe; Kil, Hyosub; Wolven, Brian; Zhang, Yongliang;

Published by:       Published on:

YEAR: 2019     DOI:

Multiscale Coupling and Energy Transfer in the Magnetosphere-Ionosphere-Thermosphere-Mesosphere System II Posters

Nishimura, Toshi; Paxton, Larry; Lyons, Larry; Erickson, Philip;

Published by:       Published on:

YEAR: 2019     DOI:



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