GUVI Biblio





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Found 2128 entries in the Bibliography.


Showing entries from 251 through 300


2020

Temporal evolution of substorm-driven global Alfv\ en wave power above the auroral acceleration region

The onset of substorms is associated with bursty enhancements of Alfv\ en wave power throughout the magnetotail. While impossible to assess the total Alfv\ en wave power in the entire magnetotail, we have instead monitored waves that are funneled into the auroral acceleration region, in order to assess the temporal evolution of Alfv\ en wave power above the nightside auroral zone in relation to substorm phases. The substorms were grouped by three conditions: nonstorm periods, storm periods, and all (unc ...

Keiling, Andreas; Thaller, Scott; Dombeck, John; Wygant, John;

Published by: Journal of Geophysical Research: Space Physics      Published on: 03/2020

YEAR: 2020     DOI: 10.1029/2019JA027444

Alfven wave; Alfvenic electron; AURORA; auroral acceleration; magnetotail; Substorm

Aurora in the Polar Cap: A Review

This paper reviews our current understanding of auroral features that appear poleward of the main auroral oval within the polar cap, especially those that are known as Sun-aligned arcs, transpolar arcs, or theta auroras. They tend to appear predominantly during periods of quiet geomagnetic activity or northwards directed interplanetary magnetic field (IMF). We also introduce polar rain aurora which has been considered as a phenomenon on open field lines. We describe the morphology of such auroras, their ...

Hosokawa, Keisuke; Kullen, Anita; Milan, Steve; Reidy, Jade; Zou, Ying; Frey, Harald; Maggiolo, Romain; Fear, Robert;

Published by: Space Science Reviews      Published on: 02/2020

YEAR: 2020     DOI: 10.1007/s11214-020-0637-3

Auroral Structure and Dynamics From GOLD

The Global-scale Observations of the Limb and Disk (GOLD) mission data contain significant quantitative information about the aurora on a global scale. Here we present techniques for quantifying such information, including the temporal development of the structure within the auroral oval using the GOLD images. These techniques are applied to auroral observations in the GOLD data, in particular showing an example of how the longitudinal structure within the aurora varies over the course of six consecutive days with differi ...

Michell, R.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 02/2020

YEAR: 2020     DOI: 10.1029/2019JA027650

AURORA; GOLD; GUVI

Dynamical Properties of Peak and Time-Integrated Geomagnetic Events Inferred From Sample Entropy

We provide a comprehensive statistical analysis of the sample entropy of peak and time-integrated geomagnetic events in 2001\textendash2017, considering different measures of event strength, different geomagnetic indices, and a simplified solar wind-magnetosphere coupling function urn:x-wiley:jgra:media:jgra55526:jgra55526-math-0001. Our investigations ...

Mourenas, D.; Artemyev, A.; Zhang, X.-J.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 02/2020

YEAR: 2020     DOI: 10.1029/2019JA027599

Dynamical complexity; Entropy; geomagnetic indices; Geomagnetic storms; Solar wind magnetosphere coupling

Evaluation on the Quasi-Realistic Ionospheric Prediction Using an Ensemble Kalman Filter Data Assimilation Algorithm

In this work, we evaluated the quasi-realistic ionosphere forecasting capability by an ensemble Kalman filter (EnKF) ionosphere and thermosphere data assimilation algorithm. The National Center for Atmospheric Research Thermosphere Ionosphere Electrodynamics General Circulation Model is used as the background model in the system. The slant total electron contents (TECs) from global International Global Navigation Satellite Systems Service ground-based receivers and from the Constellation Observing System for Meteorology, ...

He, Jianhui; Yue, Xinan; Le, Huijun; Ren, Zhipeng; Wan, Weixing;

Published by: Space Weather      Published on: 02/2020

YEAR: 2020     DOI: 10.1029/2019SW002410

Investigating Magnetosphere-Ionosphere-Thermosphere (M-I-T) Coupling Occurring During the 7\textendash8 November 2004 Superstorm

In this study, we investigate the shock-sheath driven 7\textendash8 November 2004 superstorm for its flux transfer events and resultant flow channel (FC) events and associated neutral (DN) and electron (Ne) density features in order to understand better the underlying coupled magnetosphere (M) and ionosphere (I) processes and responses in the thermosphere (T). We focus on the (i) subauroral, auroral, and polar cap regions, (ii) localized DN increases and associated Ne features and ...

Horvath, Ildiko; Lovell, Brian;

Published by: Journal of Geophysical Research: Space Physics      Published on: 02/2020

YEAR: 2020     DOI: 10.1029/2019JA027484

flow channels; large-scale FACs; localized neutral density increases; nitric oxide (NO); Poynting flux; type-1 and type-2 aurorae

Modeled IMF B y Effects on the Polar Ionosphere and Thermosphere Coupling

There is still an inadequate understanding of how the interplanetary magnetic field (IMF) east-west component (By) affects thermospheric composition, and other ionospheric and thermospheric fields in a systematic way. Utilizing the state-of-art first-principles Coupled Magnetosphere Ionosphere Thermosphere (CMIT) modeling and TIMED/Global Ultraviolet Imager (GUVI)-observed ΣO/N2 covering an entire solar cycle (year 2002\textendash2016), as well as a neutral parcel trajectory tracin ...

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

Published by: Journal of Geophysical Research: Space Physics      Published on: 02/2020

YEAR: 2020     DOI: 10.1029/2019JA026949

Modeling the Impact of Metallic Ion Layers on Equatorial Spread With SAMI3/ESF

The impact of urn:x-wiley:grl:media:grl60258:grl60258-math-0005 region metal ion layers on the development of equatorial plasma bubbles is investigated using the SAMI3/ESF model. We find that metal ion layers reduce the growth rate of the generalized Rayleigh-Taylor instability (GRTI) and act to suppress the development of equatorial plasma bubbles. This is consistent with ...

Huba, J.; Krall, J.; Drob, D.;

Published by: Geophysical Research Letters      Published on: 02/2020

YEAR: 2020     DOI: 10.1029/2020GL087224

Equatorial ionosphere; Equatorial Spread F; metal ions; sporadic E

Traits of sub-kilometre F-region irregularities as seen with the Swarm satellites

During the night, in the F-region, equatorial ionospheric irregularities manifest as plasma depletions observed by satellites, and they may cause radio signals to fluctuate. In this study, the distribution characteristics of ionospheric F-region irregularities in the low latitudes were investigated using 16 Hz electron density observations made by a faceplate which is a component of the electric field instrument (EFI) onboard Swarm satellites of the European Space Agency (ESA). The study covers the peri ...

Aol, Sharon; Buchert, Stephan; Jurua, Edward;

Published by: Annales Geophysicae      Published on: 02/2020

YEAR: 2020     DOI: 10.5194/angeo-38-243-2020

A case study of isolated auroral spots based on DMSP data

This study employed ultraviolet images and particle data to investigate isolated auroral spots away from the Earth\textquoterights auroral oval. Data from SSUSI (Special Sensor Ultraviolet Spectrographic Imager) and SSJ (Special Sensor J) mounted on the DMSP (Defence Meteorological Satellite Program) spacecraft were examined. The isolated auroral spots were observed by DMSP F16/SSUSI and F17/SSUSI on 29 May 2010 during the recovery phase of a moderate geomagnetic storm with a minimum SYM-H index of -70 ...

Zhou, Su; Chen, Yuqing; Zhang, Jin;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: 01/2020

YEAR: 2020     DOI: 10.1016/j.jastp.2019.105176

Isolated auroral spots; Proton aurora; Subauroral electron precipitation

Comparison of Reference Heights of O/N 2 and ∑O/N 2 Based on GUVI Dayside Limb Measurement

We define a new thermospheric concept, the reference heights of O/N2, referring to a series of thermospheric heights corresponding to the fixed ratios of O to N2 number density. Here, based on Global Ultraviolet Imager (GUVI) limb measurement, we compare O/N2 column density ratio (∑O/N2) and the reference heights of O/N2. We choose the transition height of O and N2 (transition height hereafter), a special reference height at which O number density is equa ...

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

Published by: Space Weather      Published on: 01/2020

YEAR: 2020     DOI: 10.1029/2019SW002391

O/N2 ratio

Diffuse and Pulsating Aurora

This chapter reviews fundamental properties and recent advances of diffuse and pulsating aurora. Diffuse and pulsating aurora often occurs on closed field lines and involves energetic electron precipitation by wave-particle interaction. After summarizing the definition, large-scale morphology, types of pulsation, and driving processes, we review observation techniques, occurrence, duration, altitude, evolution, small-scale structures, fast modulation, relation to high-energy precipitation, the role of E ...

Nishimura, Yukitoshi; Lessard, Marc; Katoh, Yuto; Miyoshi, Yoshizumi; Grono, Eric; Partamies, Noora; Sivadas, Nithin; Hosokawa, Keisuke; Fukizawa, Mizuki; Samara, Marilia; Michell, Robert; Kataoka, Ryuho; Sakanoi, Takeshi; Whiter, Daniel; Oyama, Shin-ichiro; Ogawa, Yasunobu; Kurita, Satoshi;

Published by: Space Science Reviews      Published on: 01/2020

YEAR: 2020     DOI: 10.1007/s11214-019-0629-3

The Far Ultraviolet Signatures of Conjugate Photoelectrons Seen by the Special Sensor Ultraviolet Spectrographic Imager

This study investigates the origin of anomalous far ultraviolet emissions observed at night at the subauroral region by the Special Sensor Ultraviolet Spectrographic Imager on board the Defense Meteorological Satellite System-F16 satellite. The global distribution of the anomalous emission is derived using the measurements of the oxygen atom 130.4-nm emission in 2017. Our results show the extension of the anomalous emission from high latitudes to middle latitudes in the Northern American-Atlantic sector during the Decembe ...

Kil, Hyosub; Schaefer, Robert; Paxton, Larry; Jee, Geonhwa;

Published by: Geophysical Research Letters      Published on: 01/2020

YEAR: 2020     DOI: 10.1029/2019GL086383

conjugate photoelectron; far ultraviolet emission; thermosphere; remote sensing data

Impacts of Binning Methods on High-Latitude Electrodynamic Forcing: Static Versus Boundary-Oriented Binning Methods

An outstanding issue in the general circulation model simulations for Earth\textquoterights upper atmosphere is the inaccurate estimation of Joule heating, which could be associated with the inaccuracy of empirical models for high-latitude electrodynamic forcing. The binning methods used to develop those empirical models may contribute to the inaccuracy. Traditionally, data are binned through a static binning approach by using fixed geomagnetic coordinates, in which the dynamic nature of the forcing is ...

Zhu, Qingyu; Deng, Yue; Richmond, Arthur; Maute, Astrid; Chen, Yun-Ju; Hairston, Marc; Kilcommons, Liam; Knipp, Delores; Redmon, Robert; Mitchell, Elizabeth;

Published by: Journal of Geophysical Research: Space Physics      Published on: 01/2020

YEAR: 2020     DOI: 10.1029/2019JA027270

Electric field; high latitude; Joule heating; particle precipitation

The physics of space weather/solar-terrestrial physics (STP): what we know now and what the current and future challenges are

Major geomagnetic storms are caused by un-usually intense solar wind southward magnetic fields thatimpinge upon the Earth\textquoterights magnetosphere (Dungey, 1961).How can we predict the occurrence of future interplanetary events? Do we currently know enough of t ...

Tsurutani, Bruce; Lakhina, Gurbax; Hajra, Rajkumar;

Published by: Nonlinear Processes in Geophysics      Published on: 01/2020

YEAR: 2020     DOI: 10.5194/npg-27-75-2020

Real-Time Thermospheric Density Estimation via Two-Line Element Data Assimilation

Inaccurate estimates of the thermospheric density are a major source of error in low Earth orbit prediction. Therefore, real-time density estimation is required to improve orbit prediction. In this work, we develop a dynamic reduced-order model for the thermospheric density that enables real-time density estimation using two-line element (TLE) data. For this, the global thermospheric density is represented by the main spatial modes of the atmosphere and a time-varying low-dimensional state and a linear ...

Gondelach, David; Linares, Richard;

Published by: Space Weather      Published on: 01/2020

YEAR: 2020     DOI: 10.1029/2019SW002356

density estimation; reduced-order modeling; satellite drag; thermospheric density modeling; two-line element data

Effects on the equatorial and low latitude thermosphere and ionosphere during the 19—22 December 2015 geomagnetic storm period

Mansilla, Gustavo; Zossi, MM;

Published by: Advances in Space Research      Published on:

YEAR: 2020     DOI:

Ionospheric parameters in the European sector during the magnetic storm of August 25—26, 2018

Blagoveshchensky, DV; Sergeeva, MA;

Published by: Advances in Space Research      Published on:

YEAR: 2020     DOI:

A New method for deriving the nightside thermospheric density based on guvi dayside limb observations

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

Published by: Space Weather      Published on:

YEAR: 2020     DOI:

An observational review on influence of intense geomagnetic storm on positional accuracy of NavIC/IRNSS system

Desai, Mehul; Shah, Shweta;

Published by: IETE Technical Review      Published on:

YEAR: 2020     DOI:

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

Chakraborty, Sumanjit; Ray, Sarbani; Sur, Dibyendu; Datta, Abhirup; Paul, Ashik;

Published by: Advances in Space Research      Published on:

YEAR: 2020     DOI:

Bifurcated Region 2 Field-Aligned Currents Associated With Substorms

Sangha, H; Milan, SE; Carter, JA; Fogg, AR; Anderson, BJ; Korth, H; Paxton, LJ;

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

YEAR: 2020     DOI:

The far ultraviolet signatures of conjugate photoelectrons seen by the Special Sensor Ultraviolet Spectrographic Imager

Kil, Hyosub; Schaefer, Robert; Paxton, Larry; Jee, Geonhwa;

Published by: Geophysical Research Letters      Published on:

YEAR: 2020     DOI:

Understanding the Behavior of the Ionosphere—Thermosphere—Mesosphere at Solar Minimum I

Paxton, Larry; Deng, Yue; Liu, Huixin; Fang, Tzu-Wei;

Published by:       Published on:

YEAR: 2020     DOI:

Middle atmosphere ionization from auroral particle precipitation as observed by the SSUSI satellite instruments

Bender, Stefan; Espy, Patrick; Paxton, Larry;

Published by:       Published on:

YEAR: 2020     DOI:

Height-Integrated Ionospheric Conductances Parameterized By Interplanetary Magnetic Field and Substorm Phase

Carter, JA; Milan, SE; Paxton, LJ; Anderson, BJ; Gjerloev, J;

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

YEAR: 2020     DOI:

Magnetospheric Conditions for STEVE and SAID: Particle Injection, Substorm Surge, and Field-Aligned Currents

Nishimura, Y; Yang, J; Weygand, JM; Wang, W; Kosar, B; Donovan, EF; , Angelopoulos; Paxton, LJ; Nishitani, N;

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

YEAR: 2020     DOI:

Estimation of solar EUV flux from TIMED/GUVI data

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

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

YEAR: 2020     DOI:

Impacts of Lower Thermospheric Atomic Oxygen on Thermospheric Dynamics and Composition Using the Global Ionosphere Thermosphere Model

Malhotra, Garima; Ridley, Aaron; Marsh, Daniel; Wu, Chen; Paxton, Larry; Mlynczak, Martin;

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

YEAR: 2020     DOI:

Origin and distribution of daytime electron density irregularities in the low-latitude F region

Kil, Hyosub; Lee, Woo; Paxton, Larry;

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

YEAR: 2020     DOI:

SIHLA, a mission of opportunity to L1 to map H Lyman alpha emissions from the heliopause, the interplanetary medium, the Earth s geocorona and comets

Paxton, Larry; Provornikova, Elena; Roelof, Edmond; emerais, Eric; Izmodenov, Vladislav; Katushkina, Olga; Mierkiewicz, Edwin; Baliukin, Igor; Gruntman, Mike; Taguchi, Makoto; , others;

Published by:       Published on:

YEAR: 2020     DOI:

Seasonal variation of O/N2 on different pressure levels from GUVI limb measurements

Yu, Tingting; Ren, Zhipeng; Le, Huijun; Wan, Weixing; Wang, Wenbin; Cai, Xuguang; Li, Xing;

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

YEAR: 2020     DOI:

Neutral exospheric temperatures from the GOLD mission

Evans, JS; Lumpe, JD; Correira, J; , Veibell; Kyrwonos, A; McClintock, WE; Solomon, SC; Eastes, RW;

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

YEAR: 2020     DOI:

Comparison of reference heights of O/N2 and∑ O/N2 based on GUVI dayside limb measurement

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

Published by: Space weather      Published on:

YEAR: 2020     DOI:

Evaluation on the quasi-realistic ionospheric prediction using an ensemble Kalman filter data assimilation algorithm

He, Jianhui; Yue, Xinan; Le, Huijun; Ren, Zhipeng; Wan, Weixing;

Published by: Space Weather      Published on:

YEAR: 2020     DOI:

Influence of geomagnetic storms on the mid latitude D and F2 regions

Naidu, Pyla; Madhavilatha, Tirumalaraju; Devi, Malladi;

Published by: Annals of Geophysics      Published on:

YEAR: 2020     DOI:

Study the Ionospheric Total Electron Content (TEC) variation during Geomagnetic Storm in 24th Solar Cycle

Kundu, Subrata; Sasmal, Sudipta; Chakraborti, Suman; Chakrabarti, Sandip;

Published by:       Published on:

YEAR: 2020     DOI:

A Comparative Analysis of the OI 130.4-nm Emission Observed by NASA s TIMED Mission Using a Monte Carlo Radiative Transfer Model

Qin, Jianqi; Harding, Brian;

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

YEAR: 2020     DOI:

Sources of Thermospheric Variability During Solar Minimum

Cantrall, Clayton; Matsuo, Tomoko;

Published by:       Published on:

YEAR: 2020     DOI:

Ionospheric longitudinal variability in the Northern Hemisphere during magnetic storm from the GPS/GLONASS data

Chernigovskaya, MA; Shpynev, BG; Yasyukevich, AS; Khabituev, DS;

Published by:       Published on:

YEAR: 2020     DOI:

I. Ionospheric Response to the Second Strongest Geomagnetic Storm of the Solar Cycle 24: First Results from the Arabian Peninsula

Dayanandan, Baiju; Paul, Bapan; Galav, Praveen;

Published by:       Published on:

YEAR: 2020     DOI:

Unprecedented hemispheric asymmetries during a surprise ionospheric storm: A game of drivers

Astafyeva, Elvira; Bagiya, Mala; Förster, Matthias; Nishitani, Nozomu;

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

YEAR: 2020     DOI:

Response of the low-to mid-latitude ionosphere to the geomagnetic storm of September 2017

Imtiaz, Nadia; Younas, Waqar; Khan, Majid;

Published by:       Published on:

YEAR: 2020     DOI:

Hemispheric asymmetry of the dayside aurora due to imbalanced solar insolation

Liou, Kan; Mitchell, Elizabeth;

Published by: Scientific Reports      Published on:

YEAR: 2020     DOI:

Storm-time Magnetosphere-Ionosphere-Thermosphere coupling processes revealed by distributed observations and numerical simulation

Zou, Shasha; Ren, Jiaen; Wang, Zihan;

Published by:       Published on:

YEAR: 2020     DOI:

The estimation of thermosphere state variables based on coupled thermosphere and ionosphere data assimilation

He, Jianhui; Yue, Xinan;

Published by: Chinese Journal of Geophysics      Published on:

YEAR: 2020     DOI:

The Dynamical IonosphereStorms and substorms\textemdashThe new whole system approach and future challenges

This chapter covers our current understanding and recent advances in the study of Earth\textquoterights ionosphere during magnetic storms and substorms with a special focus on electrodynamics and its consequences in the past 14 years. In particular, the focus is on the new awareness of looking at the magnetosphere, ionosphere, and thermosphere (M-I-T) as a whole system that has brought us to the next level of understanding. Both ground-based observations and the new space-based observations from magneto ...

Maruyama, Naomi;

Published by:       Published on:

YEAR: 2020     DOI: 10.1016/B978-0-12-814782-5.00009-1

Ionospheric and magnetic signatures of a space weather event on 25—29 August 2018: CME and HSSWs

Younas, W; Amory-Mazaudier, Christine; Khan, Majid; Fleury, R;

Published by: Journal of geophysical research: space physics      Published on:

YEAR: 2020     DOI:

Statistical relations between auroral electrical conductances and field-aligned currents at high latitudes

Robinson, RM; Kaeppler, Stephen; Zanetti, Larry; Anderson, Brian; Vines, Sarah; Korth, Haje; Fitzmaurice, Anna;

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

YEAR: 2020     DOI:

Longitudinal variation of the ionospheric response to the 26 August 2018 geomagnetic storm at equatorial/low latitudes

Mansilla, Gustavo; Zossi, Marta;

Published by: Pure and Applied Geophysics      Published on:

YEAR: 2020     DOI:



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