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Found 1868 entries in the Bibliography.
Showing entries from 51 through 100
| 2021 |
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Space Physics and Aeronomy, Magnetospheres in the Solar System Zhang, Yongliang; Paxton, Larry; Published by: Published on: |
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Space Physics and Aeronomy, Solar Physics and Solar Wind Zhang, Yongliang; Paxton, Larry; Published by: Published on: |
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Carter, Jennifer; Samsonov, Andrey; Milan, Stephen; Branduardi-Raymont, Graziella; Ridley, Aaron; Paxton, Larry; Anderson, Brian; Waters, Colin; Edwards, Thomas; Published by: Earth and Space Science Open Archive ESSOAr Published on: |
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Goncharenko, Larisa; Harvey, Lynn; Greer, Katelynn; Zhang, Shun-Rong; Coster, Anthea; Paxton, Larry; Published by: Geophysical Research Letters Published on: |
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Spatial structures in solar wind superthermal electrons and polar rain aurora Herschbach, Dennis; Zhang, Yongliang; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: |
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Periodic variations in solar wind and responses of the magnetosphere and thermosphere in March 2017 Zhang, Yongliang; Paxton, Larry; Wang, Wenbin; Huang, Chaosong; Published by: Journal of Geophysical Research: Space Physics Published on: |
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Smith, Todd; Hacala, Ryan; Hohlfeld, Erik; Edens, Weston; Hibbitts, Charles; Paxton, Larry; Arnold, Steven; Westlake, Joseph; Rymer, Abigail; Chacos, Al; , others; Published by: Gravitational and Space Research Published on: |
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Quantifying the Impact of Dynamic Storm-Time Exospheric Density on Plasmaspheric Refilling Waldrop, Lara; Cucho-Padin, Gonzalo; Maruyama, Naomi; Published by: Earth and Space Science Open Archive ESSOAr Published on: |
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Transpolar arcs: Seasonal dependence identified by an automated detection algorithm Bower, Gemma; Milan, Stephen; Paxton, Larry; Published by: Earth and Space Science Open Archive ESSOAr Published on: |
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Ionospheric and thermospheric contributions in TIMED/GUVI O 135.6 nm radiances Zhang, Yongliang; Paxton, Larry; Schaefer, Robert; Published by: Journal of Geophysical Research: Space Physics Published on: |
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Schaefer, Robert; Paxton, Larry; Zhang, Yongliang; Kil, Hyosub; Romeo, Giuseppe; Wolven, Brian; Yonker, Justin; Published by: Published on: |
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Themens, David; Jayachandran, Thayyil; McCaffrey, Anthony; Reid, Benjamin; Watson, Chris; Published by: 43rd COSPAR Scientific Assembly. Held 28 January-4 February Published on: |
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Dual-lobe reconnection and cusp-aligned auroral arcs Milan, Stephen; Bower, Gemma; Carter, Jennifer; Paxton, Larry; Anderson, Brian; Hairston, Marc; Published by: Published on: |
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Watson, C; Themens, DR; Jayachandran, PT; Published by: Space Weather Published on: |
| 2020 |
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Corotation of ring current auroral spots at sub-auroral latitudes We report observations of auroral spots s at sub-auroral latitudes. The auroral spots occurred during storm-recovery phases and corotated with the Earth at a speed either higher (super-rotation) or lower (sub-rotation) than the Earth\textquoterights rotation rate. In the dawn side, the spots have a slightly higher probability of super-rotation than that of the duskside auroral spots. The super- and sub-rotation is likely due to dynamics of the plasmasphere that is controlled by both drag (sub-rotation) and solar wind driv ... Zhang, Yongliang; Paxton, Larry; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: Jan-02-2020 YEAR: 2020 DOI: 10.1016/j.jastp.2020.105195 |
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A new model of exospheric temperatures has been developed, with the objective of predicting global values with greater spatial and temporal accuracy. From these temperatures, the neutral densities in the thermosphere can be calculated, through use of the Naval Research Laboratory Mass Spectrometer and Incoherent Scatter radar Extended (NRLMSISE-00) model. The exospheric temperature model is derived from measurements of the neutral densities on several satellites. These data were sorted into triangular c ... Weimer, D.; Mehta, P.; Tobiska, W.; Doornbos, E.; Mlynczak, M.; Drob, D.; Emmert, J.; Published by: Space Weather Published on: 12/2019 YEAR: 2020 DOI: 10.1029/2019SW002355 |
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Multi-scale ionosphere responses to the May 2017 magnetic storm over the Asian sector We investigate multi-scale ionospheric responses to the May 27, 2017, geomagnetic storm over the Asian sector by using multi-instrumental observations, including ground-based global navigation satellite systems (GNSS) network, constellation observing system for meteorology, ionosphere and climate radio occultation, the FengYun-3C (FY-3C) GNSS occultation sounder electron density profiles and in situ plasma density observations provided by both Swarm and defense meteorological satellite program missions. This geomagnetic s ... Liu, Lei; Zou, Shasha; Yao, Yibin; Aa, Ercha; Published by: GPS Solutions Published on: 12/2019 YEAR: 2020 DOI: 10.1007/s10291-019-0940-1 Blob structure; Positive and negative ionosphere responses; TID; Geomagnetic storms |
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Equatorial plasma bubbles (EPBs) are common features of the equatorial and low-latitude ionosphere and are known to cause radio wave scintillation which leads to the degradation of communication and navigation systems. Although these structures have been studied for decades, a full understanding of their evolution and dynamics remains important for space weather mitigation purposes. In this study, we present cases of EPBs occurrences around April and July 2012 geomagnetic storm periods over the African ... Giday, Nigussie; Katamzi-Joseph, Zama; Stoneback, Russell; Published by: Advances in Space Research Published on: 04/2020 YEAR: 2020 DOI: 10.1016/j.asr.2020.01.013 |
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A method to derive global O/N2 ratios from SSUSI/DMSP based on Re-AURIC algorithm Global thermospheric O/N2 column density ratios are obtained using the SSUSI/DMSP far-ultraviolet (FUV) dayglow data and the Re-AURIC simulation results. The Re-AURIC is derived from the AURIC algorithm after some old modules are updated. The calculation processes of O/N2 ratio are then established using the simulations of Re-AURIC to calibrate the ratios of the OI 135.6\ nm emission and N2 LBHS emission from SSUSI observations. The standard deviation (1σ) and correlation co ... Ding, GuangXing; Chen, Bo; Zhang, Xiaoxin; He, Fei; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: 03/2020 YEAR: 2020 DOI: 10.1016/j.jastp.2020.105196 |
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The present paper reports coordinated ionospheric irregularity measurements at optical as well as GPS wavelengths. Optical measurements were obtained from Tiny Ionospheric Photometer (TIP) sensors installed onboard the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) satellites. GPS radio signals were obtained from a dual frequency GPS receiver operational at Calcutta (22.58\textdegreeN, 88.38\textdegreeE geographic; geomagnetic dip: 32.96\textdegree; 13.00\textdegreeN, 161.63\textdegreeE g ... Paul, Ashik; Sur, Dibyendu; Haralambous, Haris; Published by: Advances in Space Research Published on: 03/2020 YEAR: 2020 DOI: 10.1016/j.asr.2019.11.035 GPS radio measurements; ionospheric irregularities; Northern crest of EIA; Optical measurements; solar minimum; TIP |
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Response of the low- to mid-latitude ionosphere to the geomagnetic storm of September 2017 We study the impact of the geomagnetic storm of 7\textendash9\ September\ 2017 on the low- to mid-latitude ionosphere. The prominent feature of this solar event is the sequential occurrence of two SYM-H minima with values of -146 and -115 nT on 8\ September at 01:08 and 13:56 UT, respectively. The study is based on the analysis of data from the Global Positioning System (GPS) stations and magnetic observatories located at different longitudinal sectors corresponding to the Pacific, Asia, Africa and the Amer ... Imtiaz, Nadia; Younas, Waqar; Khan, Majid; Published by: Annales Geophysicae Published on: 03/2020 YEAR: 2020 DOI: 10.5194/angeo-38-359-2020 |
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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 |
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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 |
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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 ... Published by: Journal of Geophysical Research: Space Physics Published on: 02/2020 YEAR: 2020 DOI: 10.1029/2019JA027650 |
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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 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 |
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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 |
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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 |
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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 |
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Modeling the Impact of Metallic Ion Layers on Equatorial Spread With SAMI3/ESF The impact of 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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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Published by: Advances in Space Research Published on: |
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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: |
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Yu, Tingting; Ren, Zhipeng; Yu, You; Wan, Weixing; Published by: Space Weather Published on: |
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Published by: IETE Technical Review Published on: |
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Chakraborty, Sumanjit; Ray, Sarbani; Sur, Dibyendu; Datta, Abhirup; Paul, Ashik; Published by: Advances in Space Research Published on: |
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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: |
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Kil, Hyosub; Schaefer, Robert; Paxton, Larry; Jee, Geonhwa; Published by: Geophysical Research Letters Published on: |
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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: |
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Bender, Stefan; Espy, Patrick; Paxton, Larry; Published by: Published on: |
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Carter, JA; Milan, SE; Paxton, LJ; Anderson, BJ; Gjerloev, J; Published by: Journal of Geophysical Research: Space Physics Published on: |
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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: |
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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: |
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Malhotra, Garima; Ridley, Aaron; Marsh, Daniel; Wu, Chen; Paxton, Larry; Mlynczak, Martin; Published by: Journal of Geophysical Research: Space Physics Published on: |
. Our investigations ... 
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 ... 
