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Found 81 entries in the Bibliography.
Showing entries from 1 through 50
2022 |
Low-latitude plasma blobs above Africa: Exploiting GOLD and multi-satellite in situ measurements Low-latitude plasma blobs are localized density enhancements of electron density that are occasionally observed in the night-time tropical ionosphere. Two-dimensional (2D) imaging of this phenomenon has been rare and frequently restricted to Central/South America, which is densely covered with ground-based airglow imagers and Global Navigation Satellite System (GNSS) receivers. In Africa, on the contrary, no 2D image of a blob has been reported. Here we present two low-latitude blob events above Africa, one in the Northern s ... Park, Jaeheung; Min, Kyoung; Eastes, Richard; Chao, Chi; Kim, Hee-Eun; Lee, Junchan; Sohn, Jongdae; Ryu, Kwangsun; Seo, Hoonkyu; Yoo, Ji-Hyeon; Lee, Seunguk; Woo, Changho; Kim, Eo-Jin; Published by: Advances in Space Research Published on: may YEAR: 2022   DOI: 10.1016/j.asr.2022.05.021 |
Scintillation due to ionospheric plasma irregularities remains a challenging task for the space science community as it can severely threaten the dynamic systems relying on space-based navigation services. In the present paper, we probe the ionospheric current and plasma irregularity characteristics from a latitudinal arrangement of magnetometers and Global Navigation Satellite System (GNSS) stations from the equator to the far low latitude location over the Indian longitudes, during the severe space weather events of 6–10 ... Vankadara, Ram; Panda, Sampad; Amory-Mazaudier, Christine; Fleury, Rolland; Devanaboyina, Venkata; Pant, Tarun; Jamjareegulgarn, Punyawi; Haq, Mohd; Okoh, Daniel; Seemala, Gopi; Published by: Remote Sensing Published on: jan YEAR: 2022   DOI: 10.3390/rs14030652 space weather; equatorial plasma bubbles; ionospheric irregularity; global navigation satellite system; magnetometer; poleward drift; rate of change of TEC index; scintillations; storm-time electric currents |
2021 |
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: |
2020 |
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 |
Particle precipitation is a central aspect of space weather, as it strongly couples the magnetosphere and the ionosphere and can be responsible for radio signal disruption at high Grandin, Maxime; Turc, Lucile; Battarbee, Markus; Ganse, Urs; Johlander, Andreas; Pfau-Kempf, Yann; Dubart, Maxime; Palmroth, Minna; Published by: Journal of space weather and space climate Published on: YEAR: 2020   DOI: 10.1051/swsc/2020053 |
2019 |
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 |
Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars The Super Dual Auroral Radar Network (SuperDARN) is a network of high-frequency (HF) radars located in the high- and mid-latitude regions of both hemispheres that is operated under international cooperation. The network was originally designed for monitoring the dynamics of the ionosphere and upper atmosphere in the high-latitude regions. However, over the last approximately 15 years, SuperDARN has expanded into the mid-latitude regions. With radar coverage that now extends continuously from auroral to sub-auroral and mid- ... Nishitani, Nozomu; Ruohoniemi, John; Lester, Mark; Baker, Joseph; Koustov, Alexandre; Shepherd, Simon; Chisham, Gareth; Hori, Tomoaki; Thomas, Evan; Makarevich, Roman; , others; Published by: Progress in Earth and Planetary Science Published on: YEAR: 2019   DOI: 10.1186/s40645-019-0270-5 |
Topside ionospheric conditions during the 7—8 September 2017 geomagnetic storm The uplooking total electron contents (TECs) from the GRACE, SWARM-A, TerraSAR-X, and MetOp-A satellites and in situ electron density (Ne) from SWARM-A were utilized to investigate the topside ionospheric conditions during the 7–8 September 2017 geomagnetic storm. The rate of TEC index (ROTI) and rate of density index (RODI), which are derivative indices of TEC and Ne, respectively, were also used to characterize the topside ionospheric irregularities. The main results of this study are as follows: (1) There were significa ... Jimoh, Oluwaseyi; Lei, Jiuhou; Zhong, Jiahao; Owolabi, Charles; Luan, Xiaoli; Dou, Xiankang; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2019   DOI: 10.1029/2019JA026590 |
Space Weather Program at Antarctica The use of GPS (Global Positioning System) in diverse areas such as surveying, enroute navigation and precision approach of aircraft, deformation monitoring, and various land/marine navigation applications necessitate high accuracy and availability. In the presence of time varying irregularities in ionospheric degrades the performance of the GPS receiver. Tiwari, R; Purohit, PK; Gwal, AK; Published by: Published on: |
2018 |
Lyons, LR; Gallardo-Lacourt, B; Zou, Y; Nishimura, Y; Anderson, P; , Angelopoulos; Donovan, EF; Ruohoniemi, JM; Mitchell, E; Paxton, LJ; , others; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: |
The JHU APL Commercial Launch Program: JANUS is finally getting off the ground
Smith, Howard; Hacala, Ryan; Hohlfeld, Erik; Edens, Wes; Paxton, Larry; Hibbitts, Charles; Arnold, Steven; Published by: Published on: |
The 2018 Parker Solar/Heliophysics Lecture
Paxton, Larry; Cohen, Christina; Published by: Published on: |
2017 |
The effect of ring current electron scattering rates on magnetosphere-ionosphere coupling This simulation study investigated the electrodynamic impact of varying descriptions of the diffuse aurora on the magnetosphere-ionosphere (M-I) system. Pitch angle diffusion caused by waves in the inner magnetosphere is the primary source term for the diffuse aurora, especially during storm time. The magnetic local time (MLT) and storm-dependent electrodynamic impacts of the diffuse aurora were analyzed using a comparison between a new self-consistent version of the Hot Electron Ion Drift Integrator with varying electron ... Perlongo, N.; Ridley, A.; Liemohn, M.; Katus, R.; Published by: Journal of Geophysical Research: Space Physics Published on: 04/2017 YEAR: 2017   DOI: 10.1002/2016JA023679 |
Driving of Dramatic Geomagnetic Activity by Enhancement of Meso-Scale Polar-cap Flows
Lyons, Larry; Gallardo-Lacourt, Bea; Zou, Ying; Nishimura, Yukitoshi; Anderson, Phillip; Angelopoulos, VASSILIS; Ruohoniemi, Michael; Mitchell, Elizabeth; Paxton, Larry; Nishitani, Nozomu; Published by: Published on: |
Paxton, Larry; Cohen, Christina; Published by: Published on: |
2016 |
Ionospheric Space Weather: Longitude Dependence and Lower Atmosphere Forcing This monograph is the outcome of an American Geophysical Union Chapman Conference on longitude and hemispheric dependence of ionospheric space weather, including the Fuller-Rowell, Timothy; Yizengaw, Endawoke; Doherty, Patricia; Basu, Sunanda; Published by: Published on: |
2015 |
GPS phase scintillation at high latitudes during two geomagnetic storms
Prikryl, Paul; Ghoddousi-Fard, Reza; Ruohoniemi, John; Thomas, Evan; Zhang, Y; Paxton, LJ; Published by: Auroral dynamics and space weather Published on: |
2014 |
This paper investigates unusually deep and sudden electron density depletions (troughs) observed in the Poker Flat (Alaska) Incoherent Scatter Radar data in middle summer of 2007 and 2008. The troughs were observed in the premidnight sector during periods of weak magnetic and solar activity. The density recovered to normal levels around midnight. At the time when the electron density was undergoing its steep decrease, there was usually a surge of the order of 100 to 400 K in the ion temperature that lasted less than 1 h. ... Richards, P.; Nicolls, M.; St.-Maurice, J.-P.; Goodwin, L.; Ruohoniemi, J.; Published by: Journal of Geophysical Research: Space Physics Published on: 12/2014 YEAR: 2014   DOI: 10.1002/jgra.v119.1210.1002/2014JA020541 |
Solar filament impact on 21 January 2005: Geospace consequences On 21 January 2005, a moderate magnetic storm produced a number of anomalous features, some seen more typically during superstorms. The aim of this study is to establish the differences in the space environment from what we expect (and normally observe) for a storm of this intensity, which make it behave in some ways like a superstorm. The storm was driven by one of the fastest interplanetary coronal mass ejections in solar cycle 23, containing a piece of the dense erupting solar filament material. The momentum of the mas ... Kozyra, J.; Liemohn, M.; Cattell, C.; De Zeeuw, D.; Escoubet, C.; Evans, D.; Fang, X.; Fok, M.-C.; Frey, H.; Gonzalez, W.; Hairston, M.; Heelis, R.; Lu, G.; Manchester, W.; Mende, S.; Paxton, L.; Rastaetter, L.; Ridley, A.; Sandanger, M.; Soraas, F.; Sotirelis, T.; Thomsen, M.; Tsurutani, B.; Verkhoglyadova, O.; Published by: Journal of Geophysical Research: Space Physics Published on: 07/2014 YEAR: 2014   DOI: 10.1002/2013JA019748 cold dense plasma sheet; Equatorial anomaly; magnetotail; precipitation; prompt penetration electric field; solar filament |
2013 |
Is Space Weather Different Over Africa, and If So, Why? An AGU Chapman Conference Report With the increasing reliance on technology, the impact of space weather on engineered systems will certainly increase unless suitable protective measures are taken. Understanding the physics behind space weather impacts and improving the forecasting are the major objectives of the space science community. It is well recognized that many space weather impacts, especially on communications systems, arise from structures in the ionosphere. The equatorial ionosphere, in particular, is one of the most complex and is host to nu ... Yizengaw, Endawoke; Doherty, Patricia; Fuller-Rowell, Tim; Published by: Space Weather Published on: 07/2013 YEAR: 2013   DOI: 10.1002/swe.20063 atmosphere ionosphere interactions; ionospheric irregularities; space weather |
The Study of the origin of broad plasma depletions in the equatorial F region
Oh, S; Lee, W; Kil, H; Kwak, Y; Paxton, L; Zhang, Y; Published by: Published on: |
2012 |
Malone, Charles; Johnson, Paul; Liu, Xianming; Ajdari, Bahar; Kanik, Isik; Khakoo, Murtadha; Published by: Physical Review A Published on: 06/2012 YEAR: 2012   DOI: 10.1103/PhysRevA.85.062704 |
Reversed two-cell convection in the northern and southern hemisphere during northward IMF
Lu, G; Li, W; Raeder, J; Deng, Y; Rich, F; Ober, D; Zhang, Y; Paxton, L; Ruohoniemi, M; Hairston, M; , others; Published by: Published on: |
Persistent longitudinal features in the low-latitude ionosphere
Kil, H; Lee, WK; Kwak, Y-S; Oh, S-J; Paxton, LJ; Zhang, Y; Published by: Journal of Geophysical Research: Space Physics Published on: |
2011 |
Lu, G.; Li, W.; Raeder, J.; Deng, Y.; Rich, F.; Ober, D.; Zhang, Y.; Paxton, L.; Ruohoniemi, J.; Hairston, M.; Newell, P.; Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011   DOI: 10.1029/2011JA017043 |
The source of the longitudinal asymmetry in the ionospheric tidal structure
Kil, H.; Kwak, Y.-S.; Oh, S.-J.; Talaat, E.; Paxton, L.; Zhang, Y.; Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011   DOI: 10.1029/2011JA016781 |
Temporal and spatial components in the storm-time ionospheric disturbances
Kil, Hyosub; Paxton, L.; Kim, Khan-Hyuk; Park, Sarah; Zhang, Yongliang; Oh, Seung-Jun; Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011   DOI: 10.1029/2011JA016750 |
Longitudinal asymmetry in the crest intensity of the ionospheric tidal structure
Kil, H; Paxton, LJ; Zhang, Y; Kwak, Y; Oh, S; Published by: Published on: |
2010 |
Is DE2 the source of the ionospheric wave number 3 longitudinal structure?
Kil, H.; Paxton, L.; Lee, W.; Ren, Z.; Oh, S.-J.; Kwak, Y.-S.; Published by: Journal of Geophysical Research Published on: Jan-01-2010 YEAR: 2010   DOI: 10.1029/2010JA015979 |
Published by: Published on: |
Kozyra, JU; Brandt, PC; Cattell, CA; Clilverd, M; de Zeeuw, D; Evans, DS; Fang, X; Frey, HU; Kavanagh, AJ; Liemohn, MW; , others; Published by: Published on: |
2009 |
Formation of a plasma depletion shell in the equatorial ionosphere An accurate description of the irregularity region defined by a plasma bubble is critically important in understanding the dynamics of the region and its effects on radio scintillation. Here we describe a plasma depletion region as a \textquotedblleftdepletion shell\textquotedblright and show how two-dimensional optical images from space can be used to define the shape of the depletion shell. Our simple model calculation demonstrates that the space-based optical observation can detect the plasma-depleted magnetic flux tub ... Kil, Hyosub; Heelis, Roderick; Paxton, Larry; Oh, Seung-Jun; Published by: Journal of Geophysical Research Published on: 11/2009 YEAR: 2009   DOI: 10.1029/2009JA014369 Equatorial ionosphere; plasma depletion shell; zonal shear flow |
The Variability of the Zonal Plasma Drift in the Equatorial F Region
Kil, H; Kang, C; Oh, S; Kwak, Y; Lee, W; Paxton, LJ; Published by: Published on: |
Published by: Bulletin of the Korean Space Science Society Published on: |
Putting Space Physics Data Facility (SPDF) Services to Good Use
Candey, RM; Bilitza, D; Chimiak, R; Cooper, JF; Garcia, LN; Harris, B; Johnson, RC; King, JH; Kovalick, T; Leckner, H; , others; Published by: Published on: |
The day-to-day variability of the occurrence of equatorial plasma bubbles
Oh, Seung; Kil, Hyosub; Paxton, Larry; Kim, Yong; Published by: Published on: |
Kwak, Y; Kil, H; Oh, S; Lee, W; Forbes, JM; Cho, K; Published by: Published on: |
The causal link of the DE-3 tide, vertical drift, and plasma density
Kil, Hyosub; Talaat, Elsayed; Paxton, Larry; Fang, Tzu-Wei; Oh, Seung-Jun; Published by: Published on: |
Oh, S; Kil, H; Paxton, LJ; Kim, Y; Published by: Published on: |
In the descent to solar minimum in solar cycle 23-24, the high-speed streams (HSS) were faster and longer lived than previous cycles but the average IMF was weaker and the average solar wind density lower than ever before recorded upstream of the Earth. A simulation of high speed stream activity on 22-24 January 2005 using the BATS-R-US MHD model with embedded Rice Convection Model driven by solar wind inputs indicates that, at least for this event, the interaction between high speed streams and the magnetosphere has been mo ... Kozyra, JU; Brandt, PC; Buzulukova, N; de Zeeuw, D; Fok, MH; Frey, HU; Gibson, SE; Ilie, R; Liemohn, MW; Mende, SB; , others; Published by: Published on: |
Kil, Hyosub; Paxton, Larry; Oh, Seung-Jun; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2009   DOI: 10.1029/2008JA013672 |
2008 |
Wave structures of the plasma density and vertical E$\times$ B drift in low-latitude F region We investigate the seasonal, longitudinal, local time (LT), and altitudinal variations of the F region morphology at low latitudes using data from the first Republic of China satellite (ROCSAT-1), Global Ultraviolet Imager (GUVI), on board the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite, and the Defense Meteorological Satellite Program (DMSP) F13 and F15 satellites. Signatures of the longitudinally periodic plasma density structure emerge before 0900 LT. The wave structure is established befo ... Kil, H.; Talaat, E.; Oh, S.-J.; Paxton, L.; England, S.; Su, S.-Y.; Published by: Journal of Geophysical Research Published on: Jan-01-2008 YEAR: 2008   DOI: 10.1029/2008JA013106 |
Oh, SJ; Kil, H; Kim, W; Paxton, LJ; Kim, YH; Published by: Bulletin of the Korean Space Science Society Published on: |
Wave structures of the plasma density and vertical E$\times$ B drift in low-latitude F region
Kil, H; Talaat, ER; Oh, S-J; Paxton, LJ; England, SL; Su, S-Y; Published by: Journal of Geophysical Research: Space Physics Published on: |
Oh, S-J; Kil, H; Kim, W-T; Paxton, LJ; Kim, YH; Published by: Published on: |
The temporal variability of the longitudinal plasma density structure in the low-latitude F-region
Published by: Bulletin of the Korean Space Science Society Published on: |
Kil, Hyosub; Oh, Seung-Jun; Paxton, Larry; Published by: Geophysical research letters Published on: |
Retrieval of 3-D equatorial plasma bubble characteristics from the TIMED/GUVI nightglow images.
Published by: Published on: |
2007 |
Observations of ionospheric convection from the Wallops SuperDARN radar at middle latitudes
Baker, J.; Greenwald, R.; Ruohoniemi, J.; Oksavik, K.; Gjerloev, J.; Paxton, L.; Hairston, M.; Published by: Journal of Geophysical Research Published on: Jan-01-2007 YEAR: 2007   DOI: 10.1029/2006JA011982 |
Retrieval of 2-D equatorial plasma bubble images from the TIMED/GUVI data
Published by: Published on: |
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