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Found 34 entries in the Bibliography.
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2014 |
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 massive solar filament caused it to push its way through the flux rope as the interplanetary coronal mass ejection decelerated moving toward 1 AU creating the appearance of an eroded flux rope (see companion paper by Manchester et al. (2014)) and, in this case, limiting the intensity of the resulting geomagnetic storm. On impact, the solar filament further disrupted the partial ring current shielding in existence at the time, creating a brief superfountain in the equatorial ionosphere\textemdashan unusual occurrence for a moderate storm. Within 1 h after impact, a cold dense plasma sheet (CDPS) formed out of the filament material. As the interplanetary magnetic field (IMF) rotated from obliquely to more purely northward, the magnetotail transformed from an open to a closed configuration and the CDPS evolved from warmer to cooler temperatures. Plasma sheet densities reached tens per cubic centimeter along the flanks\textemdashhigh enough to inflate the magnetotail in the simulation under northward IMF conditions despite the cool temperatures. Observational evidence for this stretching was provided by a corresponding expansion and intensification of both the auroral oval and ring current precipitation zones linked to magnetotail stretching by field line curvature scattering. Strong Joule heating in the cusps, a by-product of the CDPS formation process, contributed to an equatorward neutral wind surge that reached low latitudes within 1\textendash2 h and intensified the equatorial ionization anomaly. Understanding the geospace consequences of extremes in density and pressure is important because some of the largest and most damaging space weather events ever observed contained similar intervals of dense solar material. 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 |
Developing a Multi-Element Geospace Investigation to Understand the Impact of Hemispheric Assymetry Paxton, Larry; Newell, Patrick; Stromme, Anja; Ridley, Aaron; Kozyra, Janet; Mitchell, Elizabeth; Published by: Published on: |
2010 |
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 |
Unique Science Needs: CAWSES-II and Virtual Observatories Kozyra, JU; Fox, PA; Avery, SK; Rodger, AS; Melkers, JE; Paxton, LJ; Barnes, RJ; 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 modified by these unusual solar wind conditions. Northward IMF in the HSS drove the periodic capture of solar wind/magnetosheath plasma in the dayside magnetosphere due to high-latitude reconnection. At times of observed strong periodic auroral activity, a significant IMF By component produced a magnetospheric sash configuration in the simulations in which fingers of enhanced plasma beta were associated with strong field-aligned currents linking to the nightside auroral region. In agreement with the simulations, IMAGE HENA observed low energy (less than tens of keV) hydrogen energetic neutral atoms peaking on the dayside for the 3-days of the high speed stream activity. IMAGE FUV and TIMED GUVI observed periodic auroral activations during the HSS that resembled poleward boundary intensifications (PBIs) rather than the periodic substorms typically associated with HSS. The locations of the observed PBIs in the southern hemisphere were consistent with the high-beta fingers in the near-Earth plasma sheet predicted by the simulation. Particle injection signatures at LANL geosynchronous satellites accompanied the PBIs. To our knowledge, these results provide the first evidence in support of the role of northward IMF in HSS interactions. Based on these results, a study of energetic neutral atom images from TWINS and IMAGE HENA along with observations from other missions in the Heliophysics System Observatory is underway to determine if these characteristics are typical of HSS interactions in the current unusual solar minimum and to search for consequences throughout geospace. 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: |
2007 |
Kozyra, JU; Mlynczak, MG; Paxton, LJ; RUSSELL, JM; Published by: Published on: |
Kozyra, JU; Crowley, G; Doe, RA; Mlynczak, MG; Paxton, LJ; Skinner, WR; Solomon, SC; Talaat, E; Woods, TN; Wu, Q; , others; Published by: Published on: |
Kozyra, JU; Cattell, CA; Clilverd, M; Evans, DS; Kavanagh, A; Liemohn, MW; Mende, SB; Paxton, LJ; Ridley, A; Soraas, F; Published by: Published on: |
2006 |
Zhang, Y.; Paxton, L.; Kozyra, J.; Kil, H.; Brandt, P.; Published by: Journal of Geophysical Research Published on: Jan-01-2006 YEAR: 2006   DOI: 10.1029/2005JA011152 |
VITMO: A Virtual Observatory for the ITM Community Morrison, D; Weiss, M; Daley, R; Immer, L; Nylund, S; Yee, J; Talaat, E; Russell, J; Heelis, R; Kozyra, J; , others; Published by: Published on: |
Observing the Coupled Ionosphere-Thermosphere System: From Solar Maximum to Solar Minimum and Beyond Paxton, L; Morrison, D; Zhang, Y; Kil, H; Wolven, B; Comberiate, J; Meng, C; Kozyra, J; Christensen, A; Published by: Published on: |
Kozyra, J.; Crowley, G.; Emery, B.; Fang, X.; Maris, G.; Mlynczak, M.; Niciejewski, R.; Palo, S.; Paxton, L.; Randall, C.; Rong, P.-P.; Russell, J.; Skinner, W.; Solomon, S.; Talaat, E.; Wu, Q.; Yee, J.-H.; Published by: Published on: YEAR: 2006   DOI: 10.1029/GM16710.1029/167GM24 |
Kozyra, JU; Crowley, G; RONG, P-P; RUSSELL, JM; SKINNER, W; Solomon, SC; Published by: Geophysical monograph Published on: |
Kozyra, JU; Shibata, K; Barnes, RJ; Basu, S; Davila, JM; Fox, NJ; Gopalswamy, N; Kuznetsova, MM; Pallamraju, D; Paxton, LJ; , others; Published by: Published on: |
Kozyra, JU; Shibata, K; Fox, NJ; Basu, S; Coster, AJ; Davila, JM; Gopalswamy, N; Liou, K; Lu, G; Mann, IR; , others; Published by: Published on: |
Kozyra, JU; Barnes, R; Fox, NJ; Fox, PA; Kuznetsova, MM; Morrison, D; Pallamraju, D; , Papitashvili; Ridley, A; Talaat, ER; , others; Published by: Published on: |
2005 |
Energy transport in the thermosphere during the solar storms of April 2002 Mlynczak, Martin; Martin-Torres, Javier; Crowley, Geoff; Kratz, David; Funke, Bernd; Lu, Gang; Lopez-Puertas, Manuel; Russell, James; Kozyra, Janet; Mertens, Chris; Sharma, Ramesh; Gordley, Larry; Picard, Richard; Winick, Jeremy; Paxton, L.; Published by: Journal of Geophysical Research Published on: Jan-01-2005 YEAR: 2005   DOI: 10.1029/2005JA011141 |
Paxton, LJ; Zhang, Y; Meier, R; Strickland, D; Christensen, A; Crowley, G; Kozyra, J; Published by: Published on: |
Liemohn, Michael; Ridley, Aaron; Brandt, Pontus; Gallagher, Dennis; Kozyra, Janet; Ober, Daniel; Mitchell, Donald; Roelof, Edmond; DeMajistre, Robert; Published by: Journal of Geophysical Research: Space Physics Published on: |
Yee, J; Christensen, A; Russell, J; Killeen, T; Woods, T; Kozyra, J; Smith, A; Fritts, D; Forbes, J; Mayr, H; , others; Published by: Published on: |
TIMED Contributions to the NASA Sun-Solar System Connections Great Observatory Christensen, AB; Kozyra, J; Paxton, L; Talaat, E; Yee, J; Published by: Published on: |
Paxton, LJ; Kozyra, J; Demajistre, B; Kil, H; Morrison, D; Wolven, B; Mitchell, D; Brandt, P; Zhang, Y; Meng, C; Published by: Published on: |
Kozyra, JU; Crowley, G; Emery, BA; Fang, XH; Hagan, ME; Lu, G; Mlynczak, MG; Niciejewski, RJ; Palo, SE; Paxton, LJ; , others; Published by: Published on: |
2004 |
Zhang, Y; Paxton, LJ; Kozyra, JU; DeMajistre, R; Kil, H; Morrison, D; Wolven, B; Brandt, PC; Mitchell, DG; Talaat, E; Published by: Published on: |
First Three Years of TIMED: New Results in Sun-Earth Connections Kozyra, JU; Crowley, G; Goncharenko, LP; Hagan, ME; Lu, G; Mlynczak, MG; Paxton, LJ; RUSSELL, JM; Solomon, SC; Talaat, ER; , others; Published by: Published on: |
Liemohn, MW; Ridley, AJ; Kozyra, JU; Gallagher, DL; Henderson, MG; Denton, MH; Jahn, J; Roelof, EC; DeMajistre, R; Mitchell, DG; , others; Published by: Published on: |
Kozyra, JU; Anderson, BJ; Brandt, PC; Cattell, CA; Dombeck, JP; Hairston, MR; Heelis, RA; Huang, CY; Korth, H; Liemohn, MW; , others; Published by: Published on: |
Quantification of the spreading effect of auroral proton precipitation A three-dimensional Monte Carlo model has been developed to study the transverse beam spreading effect of incident energetic auroral protons during their precipitation in the Earth\textquoterights upper atmosphere. Energetic protons with an isotropic angular distribution are injected at 700 km altitude. Two types of incident energy spectra, a monoenergetic and a Maxwellian distribution, are considered. Interaction of fast particles with a three-species atmosphere (O, N2, and O2) is included through charge exchange, electron stripping, ionization, excitation, and elastic scattering collisions. A uniform geomagnetic field is assumed in the model. The spreading effect is simulated for both a fine proton beam and a proton arc of longitudinal and latitudinal extent. It is found that the main dispersion region for a fine proton beam is located in the altitude range of around 250\textendash450 km, where the first few charge exchange collisions play a significant role. In the spreading study for a proton arc, we compare the numerical results with previous studies and give a convincing explanation by analyzing atmospheric scale heights and cross-section data. For the purpose of the model validity check, we make a comparison of the Monte Carlo simulation with observations and the results from other models. Fang, Xiaohua; Liemohn, Michael; Kozyra, Janet; Solomon, Stanley; Published by: Journal of Geophysical Research: Space Physics (1978\textendash2012) Published on: YEAR: 2004   DOI: 10.1029/2003JA010119 |
The Global Ionosphere Thermosphere Model results of the April 2002 storm Ridley, AJ; oth, G; Deng, Y; Kozyra, J; Immel, T; Paxton, L; Published by: Published on: |
2003 |
The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) experiment on the Thermosphere-Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite observed the infrared radiative response of the thermosphere to the solar storm events of April 2002. Large radiance enhancements were observed at 5.3 μm, which are due to emission from the vibration-rotation bands of nitric oxide (NO). The emission by NO is indicative of the conversion of solar energy to infrared radiation within the atmosphere and represents a \textquotedblleftnatural thermostat\textquotedblright by which heat and energy are efficiently lost from the thermosphere to space and to the lower atmosphere. We describe the SABER observations at 5.3 μm and their interpretation in terms of energy loss. The infrared enhancements remain only for a few days, indicating that such perturbations to the thermospheric state, while dramatic, are short-lived. Mlynczak, Marty; Martin-Torres, F.; Russell, J.; Beaumont, K.; Jacobson, S.; Kozyra, J.; opez-Puertas, M.; Funke, B.; Mertens, C.; Gordley, L.; Picard, R.; Winick, J.; Wintersteiner, P.; Paxton, L.; Published by: Geophysical Research Letters Published on: 03/2003 YEAR: 2003   DOI: 10.1029/2003GL017693 |
Mlynczak, Marty; Martin-Torres, Javier; Russell, James; Beaumont, Ken; Jacobson, Steven; Kozyra, Janet; Lopez-Puertas, Manuel; Funke, Bernd; Mertens, Christopher; Gordley, Larry; , others; Published by: Geophysical Research Letters Published on: |
2002 |
Energy Balance in the Sun-Earth System During the Solar Storm Events of April 2002 Mlynczak, MG; Paxton, L; Kozyra, J; Woods, T; Zurbuchen, T; Lu, G; Lopez-Puertas, M; Martin-Torres, FJ; RUSSELL, JM; Crowley, G; , others; Published by: Published on: |
Kozyra, JU; Baker, DN; Crowley, G; Evans, DS; Fang, X; Frahm, RA; Kanekal, SG; Liemohn, MW; Lu, G; Mason, GM; , others; Published by: Published on: |
Kozyra, JU; Liemohn, MW; Mlynczak, MG; Paxton, LJ; Skinner, WR; Baker, DN; Cattell, CA; Germany, GA; Mende, SB; Pollock, CJ; Published by: Published on: |
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