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Found 32 entries in the Bibliography.
Showing entries from 1 through 32
| 2022 |
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Neutral composition information in ICON EUV dayglow observations Since the earliest space‐based observations of Earth s atmosphere, ultraviolet (UV) airglow has proven a useful resource for remote sensing of the ionosphere and thermosphere. The Tuminello, Richard; England, Scott; Sirk, Martin; Meier, Robert; Stephan, Andrew; Korpela, Eric; Immel, Thomas; Mende, Stephen; Frey, Harald; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2022 DOI: 10.1029/2022JA030592 |
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Time Delay Integration Imaging of the Nighttime Ionosphere from the ICON Observatory TIMED GUVI was on a high inclination orbit changing local time relatively slowly and missing a great deal of the equatorward low latitude regions at the wrong local times. Mende, SB; Frey, HU; England, SL; Immel, TJ; Eastes, RW; Published by: Space Science Reviews Published on: YEAR: 2022 DOI: 10.1007/s11214-022-00928-w |
| 2021 |
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Proton Aurora and Optical Emissions in the Subauroral Region Optical structures located equatorward of the main auroral oval often exhibit different morphologies and dynamics than structures at higher latitudes. In some cases, questions arise regarding the formation mechanisms of these photon-emitting phenomena. New developments in space and ground-based instruments have enabled us to acquire a clearer view of the processes playing a role in the formation of subauroral structures. In addition, the discovery of new optical structures helps us improve our understanding of the latitudina ... Gallardo-Lacourt, B.; Frey, H.; Martinis, C.; Published by: Space Science Reviews Published on: jan YEAR: 2021 DOI: 10.1007/s11214-020-00776-6 |
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In near-Earth space, variations in thermospheric composition have important implications for thermosphere-ionosphere coupling. The ratio of O to N2 is often measured using far-UV airglow observations. Taking such airglow observations from space, looking below the Earth s limb allows for the total column of O and N2 in the ionosphere to be determined. While these observations have enabled many previous studies, determining the impact of nonmigrating tides on thermospheric composition has proved difficult, owing to a small con ... England, Scott; Meier, R.; Frey, Harald; Mende, Stephen; Stephan, Andrew; Krier, Christopher; Cullens, Chihoko; Wu, Yen-Jung; Triplett, Colin; Sirk, Martin; Korpela, Eric; Harding, Brian; Englert, Christoph; Immel, Thomas; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2021 DOI: 10.1029/2021JA029575 airglow; atmospheric composition; Atmospheric tides; thermosphere |
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Conjugate Photoelectron Energy Spectra Derived From Coincident FUV and Radio Measurements We present a method for estimating incident photoelectrons energy spectra as a function of altitude by combining global scale far-ultraviolet (FUV) and radio-occultation (RO) measurements. This characterization provides timely insights important for accurate interpretation of ionospheric parameters inferred from the recently launched Ionospheric Connection Explorer (ICON) observations. Quantification of photoelectron impact is enabled by the fact that conjugate photoelectrons (CPEs) directly affect FUV airglow emissions but ... Urco, J.; Kamalabadi, F.; Kamaci, U.; Harding, B.; Frey, H.; Mende, S.; Huba, J.; England, S.; Immel, T.; Published by: Geophysical Research Letters Published on: YEAR: 2021 DOI: 10.1029/2021GL095839 airglow; conjugate photolectrons; COSMIC2; energy spectra; ICON |
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Precipitation flux and mean energy are then modeled based on TIMED GUVI-and DMSP SSUSI-inferred precipitation characteristics. Beginning with an overview of how the Themens, David; Jayachandran, Thayyil; McCaffrey, Anthony; Reid, Benjamin; Watson, Chris; Published by: 43rd COSPAR Scientific Assembly. Held 28 January-4 February Published on: |
| 2020 |
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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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Daily Variability in the Terrestrial UV Airglow New capability for observing conditions in the upper atmosphere comes with the implementation of global ultraviolet (UV) imaging from geosynchronous orbit. Observed by the NASA Immel, Thomas; Eastes, Richard; McClintock, William; Mende, Steven; Frey, Harald; Triplett, Colin; England, Scott; Published by: Atmosphere Published on: YEAR: 2020 DOI: 10.3390/atmos11101046 |
| 2019 |
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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 |
| 2018 |
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Daytime O/N2 Retrieval Algorithm for the Ionospheric Connection Explorer (ICON) The NASA Ionospheric Connection Explorer Far-Ultraviolet spectrometer, ICON FUV, will measure altitude profiles of the daytime far-ultraviolet (FUV) OI 135.6 nm and N2 Lyman-Birge-Hopfield (LBH) band emissions that are used to determine thermospheric density profiles and state parameters related to thermospheric composition; specifically the thermospheric column O/N2 ratio (symbolized as ΣO/N2). This paper describes the algorithm concept that has been adapted and updated from one previous ... Stephan, Andrew; Meier, R.; England, Scott; Mende, Stephen; Frey, Harald; Immel, Thomas; Published by: Space Science Reviews Published on: 01/2018 YEAR: 2018 DOI: 10.1007/s11214-018-0477-6 |
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The ionospheric connection explorer mission: Mission goals and design The Ionospheric Connection Explorer, or ICON, is a new NASA Explorer mission that will explore the boundary between Earth and space to understand the physical connection Immel, Thomas; England, SL; Mende, SB; Heelis, RA; Englert, CR; Edelstein, J; Frey, HU; Korpela, EJ; Taylor, ER; Craig, WW; , others; Published by: Space Science Reviews Published on: YEAR: 2018 DOI: 10.1007/s11214-017-0449-2 |
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The Ionospheric Connection Explorer (ICON) Far Ultraviolet (FUV) imager, ICON FUV, will measure altitude profiles of OI 135.6 nm emissions to infer nighttime ionospheric parameters. Kamalabadi, Farzad; Qin, Jianqi; Harding, Brian; Iliou, Dimitrios; Makela, Jonathan; Meier, RR; England, Scott; Frey, Harald; Mende, Stephen; Immel, Thomas; Published by: Space science reviews Published on: |
| 2017 |
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The Far Ultra-Violet Imager on the Icon Mission ICON Far UltraViolet (FUV) imager contributes to the ICON science objectives by providing remote sensing measurements of the daytime and nighttime atmosphere/ionosphere. During sunlit atmospheric conditions, ICON FUV images the limb altitude profile in the shortwave (SW) band at 135.6 nm and the longwave (LW) band at 157 nm perpendicular to the satellite motion to retrieve the atmospheric O/N2 ratio. In conditions of atmospheric darkness, ICON FUV measures the 135.6 nm recombination emission of O+ ions used to ... Mende, S.; Frey, H.; Rider, K.; Chou, C.; Harris, S.; Siegmund, O.; England, S.; Wilkins, C.; Craig, W.; Immel, T.; Turin, P.; Darling, N.; Loicq, J.; Blain, P.; Syrstad, E.; Thompson, B.; Burt, R.; Champagne, J.; Sevilla, P.; Ellis, S.; Published by: Space Science Reviews Published on: 10/2017 YEAR: 2017 DOI: 10.1007/s11214-017-0386-0 |
| 2016 |
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Using a three-dimensional nonhydrostatic general circulation model, we investigate the response of the thermosphere–ionosphere system to the 5–6 August 2011 major geomagnetic Yi\ugit, Erdal; Frey, Harald; Moldwin, Mark; Immel, Thomas; Ridley, Aaron; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: YEAR: 2016 DOI: 10.1016/j.jastp.2015.10.002 |
| 2015 |
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The August 2011 URSI World Day campaign: Initial results During a 10-day URSI World Day observational campaign beginning on August 1, 2011, an isolated, major geomagnetic storm occurred. On August 5,\ Kp\ reached values of 8-and\ Dst\ dropped to -113\ nT. The occurrence of this isolated storm in the middle of a 10-day URSI World Day campaign provides and unprecedented opportunity to observe the coupling of solar wind energy into the magnetosphere and to evaluate the varied effects that occur in the coupled magnetosphere\text ... Immel, Thomas; Liu, Guiping; England, Scott; Goncharenko, Larisa; Erickson, Philip; Lyashenko, Mykhaylo; Milla, Marco; Chau, Jorge; Frey, Harald; Mende, Stephen; Zhou, Qihou; Stromme, Anja; Paxton, Larry; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: 11/2015 YEAR: 2015 DOI: 10.1016/j.jastp.2015.09.005 |
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Narrowband NanoSat Scale Photometry for VUV Planetary and Heliophysics missions
Published by: Published on: |
| 2014 |
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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 |
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Strong ionospheric field-aligned currents for radial interplanetary magnetic fields The present work has investigated the configuration of field-aligned currents (FACs) during a long period of radial interplanetary magnetic field (IMF) on 19 May 2002 by using high-resolution and precise vector magnetic field measurements of CHAMP satellite. During the interest period IMF By and Bz are weakly positive and Bx keeps pointing to the Earth for almost 10 h. The geomagnetic indices Dst is about -40 ... Wang, Hui; Lühr, Hermann; Shue, Jih-Hong; Frey, Harald.; Kervalishvili, Guram; Huang, Tao; Cao, Xue; Pi, Gilbert; Ridley, Aaron; Published by: Journal of Geophysical Research: Space Physics Published on: 05/2014 YEAR: 2014 DOI: 10.1002/2014JA019951 air upwelling; field-aligned currents; radial interplanetary magnetic field |
| 2013 |
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Impacts of atmospheric ultrafast Kelvin waves on radio scintillations in the equatorial ionosphere We present a statistical analysis of the amplitudes of GPS scintillations (S4 index) observed throughout 2008\textendash2010 using the satellite radio occultation measurements of the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC). Here, for the first time, periodic variability in the occurrence of S4 is investigated using these data. Significant variations of S4 with periods of 2.5\textendash4 days (quasi-3 days) are identified from the observations during postsunset hours (1900\textendas ... Liu, Guiping; Immel, Thomas; England, Scott; Frey, Harald; Mende, Stephen; Kumar, Karanam; Ramkumar, Geetha; Published by: Journal of Geophysical Research: Space Physics Published on: 02/2013 YEAR: 2013 DOI: 10.1002/jgra.50139 day-to-day variability; Equatorial ionosphere; scintillation; Ultra Fast Kelvin planetary wave |
| 2010 |
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Interhemispheric observations of emerging polar cap asymmetries
Laundal, K.; Ostgaard, N.; Snekvik, K.; Frey, H.; Published by: Journal of Geophysical Research Published on: Jan-01-2010 YEAR: 2010 DOI: 10.1029/2009JA015160 |
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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 |
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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: |
| 2007 |
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Localized aurora beyond the auroral oval Aurora is the result of the interaction between precipitating energetic electrons and protons with the upper atmosphere. Viewed from space, it generally occurs in continuous and diffuse ovals of light around the geomagnetic poles. Additionally, there are localized regions of aurora that are unrelated to the ovals and exhibit different morphological, spatial, and temporal properties. Some of these localized aurorae are detached from the oval poleward or equatorward of it. Others are located within the oval and are brighter ... Published by: Reviews of Geophysics Published on: 03/2007 YEAR: 2007 DOI: 10.1029/2005RG000174 |
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Park, SH; England, SL; Immel, TJ; Frey, HU; Mende, SB; Published by: Journal of Geophysical Research: Space Physics Published on: |
| 2006 |
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England, S.; Immel, T.; Sagawa, E.; Henderson, S.; Hagan, M.; Mende, S.; Frey, H.; Swenson, C.; Paxton, L.; Published by: Journal of Geophysical Research Published on: Jan-01-2006 YEAR: 2006 DOI: 10.1029/2006JA011795 |
| 2005 |
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Hecht, JH; Strickland, DJ; Knight, HK; Kochenash, AJ; Zhang, Y; Morrison, MD; Paxton, LJ; Mende, SB; Frey, HU; Burke, WJ; , others; Published by: Published on: |
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England, SL; Immel, TJ; Sagawa, E; Henderson, S; Hagan, ME; Mende, SB; Frey, HU; Swenson, C; Paxton, LJ; Published by: Published on: |
| 2004 |
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IMAGE-FUV observations of the October-November 2003 flare and magnetic storm effects on Earth
Immel, TT; Ostgaard, N; Strickland, DJ; Frey, HU; Mende, SB; Lu, G; Published by: Published on: |
| 2003 |
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Galand, Marina; Lummzheim, Dirk; Frey, HU; Paxton, LJ; Christensen, AB; Published by: Published on: |
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Zhang, Y; Paxton, LJ; Immel, TJ; Frey, HU; Mende, SB; Published by: Journal of geophysical research Published on: |
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Negative ionospheric storms seen by the IMAGE FUV instrument Data from the IMAGE SI-13 instrument are used to study depletions in the OI 135.6 nm dayglow intensity due to two magnetic storms observed on 8 June and 15 July 2000. Results show that the SI-13 instrument is sensitive to changes in the 135.6 nm dayglow caused by depletion of the O/N2\ column density ratio. It is found that depletion levels in the SI-13 images are weaker than those in the true O/N2\ values or electron density parameters, such as NmF2 (peak F2 electron density) due to the N< ... Zhang, Y.; Paxton, L.J.; Kil, H.; Meng, C.-I.; Mende, S.~B.; Frey, H.~U.; Immel, T.~J.; Published by: Journal of Geophysical Research (Space Physics) Published on: YEAR: 2003 DOI: 10.1029/2002JA009797 Atmospheric Composition and Structure: Airglow and aurora; Atmospheric Composition and Structure: Thermosphere-composition and chemistry; atmospheric composition change; depletion of OI 135.6 nm dayglow; Ionosphere: Ionospheric disturbances; Ionosphere: Plasma temperature and density; Magnetospheric Physics: Storms and substorms; negative ionospheric storms |
| 2002 |
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Dayside detached auroras (DDA) refer to auroras observed separate from the equatorward edge of the main oval on the dayside. They are studied here using IMAGE FUV and DMSP particle data. Occurrence of these DDA appears to be correlated with sudden solar wind dynamic pressure enhancements and northward interplanetary magnetic field, as monitored by the Wind satellite. They are usually very dynamic and short-lived with a lifetime of the order of 10 minutes. Out of the three FUV instrument channels on IMAGE, DDA are best det ... Zhang, Y.; Paxton, L.J.; Immel, T.; Frey, H.; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2002 DOI: 10.1029/2002JA009355 AURORA; dayside detached aurora; proton precipitation; solar wind pressure enhancement |
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