Bibliography
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Found 19 entries in the Bibliography.
Showing entries from 1 through 19
2016 |
Selby, Christina; Paxton, LJ; Schaefer, RK; Ogorzalek, B; Romeo, G; Wolven, B; Hsieh, SY; Published by: Published on: |
2013 |
Auroral emissions observed in the far-ultraviolet wavelength range are compared with measurements of the coincident precipitating electrons and ions that produce the emissions in a large-scale correlative study. The auroral emissions and particle precipitation are observed with the Special Sensor Ultraviolet Spectrographic Imager and SSJ5 detectors, respectively, both onboard the DMSP F16 satellite. Coincident observations along the same magnetic field line in the Northern Hemisphere are assembled from two consecutive winters (during 2005\textendash2007). A numerical fit to 27,922 coincident observations provides an empirical relationship between the electron energy flux and the intensity of Lyman-Birge-Hopfield long emissions, JEe = 4.90 .108 (eV s\textendash1 sr\textendash1 cm\textendash2)/R ILBHL (valid in the absence of significant ion fluxes: JEe \> 10 JEion). A fit to 1308 coincident observations provides the relationship between the average electron energy and the Lyman-Birge-Hopfield short to Lyman-Birge-Hopfield long emission ratio, \<Ee \> = 19.6 keV exp(\textendash2.34 ILBHS / ILBHL) (valid from 3 to 19.6 keV). These resulting empirical relationships permit the energy flux and average energy of precipitating electrons to be inferred from far-ultraviolet imagery, in the absence of significant ion precipitation. Sotirelis, Thomas; Korth, Haje; Hsieh, Syau-Yun; Zhang, Yongliang; Morrison, Daniel; Paxton, Larry; Published by: Journal of Geophysical Research: Space Physics Published on: 03/2013 YEAR: 2013   DOI: 10.1002/jgra.50157 |
The quiet nighttime low-latitude ionosphere as observed by TIMED/GUVI In this paper, we examine the nighttime ionosphere climatology structure in the low latitude region and discrepancies between Global Ultraviolet Imager (GUVI) observations and the IRI model predictions using (1) the magnetic zonal mean of electron number density as a function of altitude and magnetic latitude, (2) vertical electron density profiles at various levels of F10.7 index, (3) nighttime descent and magnitude decrease of the ionosphere, (4) point-to-point comparisons of F-peak height (hmF2) and density (NmF2), and (5) the magnetic longitudinal variations of hmF2 and NmF2. The data collected from the Thermosphere, Ionosphere, Mesosphere, Energetics, and Dynamics (TIMED) mission since its launch in December 2001 have provided great opportunities for many scientific investigations of the ionosphere. In this analysis, we investigate the climatology of the nighttime low-latitude ionosphere under low geomagnetic activity (kp\ ⩽\ 4) using the electron density profiles inferred from the airglow measurements obtained by the GUVI aboard the TIMED spacecraft and compared with the results obtained from IRI (International Reference Ionosphere) model-2001. The observed climatology is an essential tool for further understanding the electrodynamics in the low-latitude region and improving the model\textquoterights prediction capability. The time range of the GUVI data used in this study is from 2002 (day 053) to 2006 (day 304), and the IRI model predictions were produced at every GUVI location. The ionosphere observed is generally of greater density than what IRI predicts throughout the night for all four seasons for low and moderate solar activity while the model over-predicts the electron density near the F-region peak at high solar activity before midnight. Observations show that the height of the F-region peak has a steep descent from dusk to midnight and near midnight the height of layer is insensitive to solar conditions, significantly different than what is predicted by IRI. Longitudinal features shown in GUVI data are present in the low-latitude ionosphere after sunset and continue through to midnight after which the low-latitude ionosphere is largely zonally symmetric. Talaat, E.R.; Yee, J.-H.; Hsieh, S.-Y.; Paxton, L.J.; DeMajistre, R.; Christensen, A.B.; Bilitza, D.; Published by: Advances in Space Research Published on: 02/2013 YEAR: 2013   DOI: 10.1016/j.asr.2012.11.012 |
Schaefer, RK; Wolven, BC; Paxton, L; Romeo, G; Selby, C; Hsieh, SW; Published by: Published on: |
Zimmerman, MI; Hsieh, SW; Brandt, PC; Vandegriff, JD; Stephens, GK; Toigo, AD; Keika, K; Kusterer, MB; DeMajistre, R; Published by: Published on: |
UV Remote Sensing Data Products-Turning Data Into Knowledge Weiss, M; Paxton, L; Schaefer, RK; Comberiate, J; Hsieh, SW; Romeo, G; Wolven, BC; Zhang, Y; Published by: Published on: |
A new capability has been developed at JHU/APL for forecasting the global aurora quantities based on the DMSP SSUSI data and the TIMED/GUVI Global Aurora Model. The SSUSI Aurora Forecast Model predicts the electron energy flux, mean energy, and equatorward boundary in the auroral oval for up to 1 day or 15 DMSP orbits in advance. In our presentation, we will demonstrate this newly implemented capability and its results. The future improvement plan will be discussed too. Hsieh, S.~W.; Zhang, Y.; Schaefer, R.~K.; Romeo, G.; Paxton, L.; Published by: AGU Fall Meeting Abstracts Published on: Auroral phenomena; forecasting; Ionosphere/magnetosphere interactions; Modeling and forecasting |
2012 |
Romeo, G; Paxton, LJ; Schaefer, RK; DeMajistre, R; Comberiate, J; Hsieh, SW; Miller, ES; Weiss, M; Wolven, BC; Zhang, Y; Published by: Published on: |
New and Improved GUVI Data Products for ITM Research Schaefer, RK; Paxton, LJ; DeMajistre, R; Comberiate, J; Hsieh, SW; Miller, ES; Romeo, G; Weiss, M; Wolven, BC; Zhang, Y; Published by: Published on: |
2011 |
Empirical Relationship Between LBH Auroral Emissions and Particle Precipitation Hsieh, SW; Sotirelis, T; Korth, H; Zhang, Y; Paxton, LJ; Published by: Published on: |
2010 |
Enhanced UV Data Products-Observing the Ionosphere in Greater Fidelity Wolven, BC; Paxton, LJ; Comberiate, J; Hsieh, SW; , Nylund; Schaefer, RK; Selby, C; Smith, D; Weiss, M; Zhang, Y; Published by: Published on: |
Talaat, Elsayed; Fuller-Rowell, Tim; Qian, Liying; Richards, Phil; Ridley, Aaron; Burns, Alan; Bernstein, Dennis; Chamberlin, Phillip; Fedrizzi, Mariangel; Hsieh, Syau-Yun; , others; Published by: 38th COSPAR Scientific Assembly Published on: |
Online 3-D Visualization of ENA Inversions with Simultaneous In-situ Measurements Kusterer, M; Brandt, PC; DeMajistre, R; Hsieh, SW; Vandegriff, JD; Published by: Published on: |
2009 |
Schaefer, RK; Morrison, D; Paxton, L; Holm, J; Weiss, M; Hsieh, S; Published by: Published on: |
Wolven, BC; Schaefer, RK; Hsieh, SW; Paxton, LJ; Published by: Published on: |
2007 |
Wolven, BC; Hsieh, S; Schaefer, RK; Published by: Published on: |
Hsieh, SW; Talaat, ER; Bilitza, D; DeMajistre, R; Paxton, L; Christensen, A; Yee, J; Published by: Published on: |
2006 |
TIMED/GUVI and DMSP/SSUSI-Data Products for Space Weather Hsieh, S; Paxton, L; Zhang, Y; DeMajistre, R; Wolven, B; Morrison, D; Schaefer, R; Published by: Published on: |
2003 |
TIMED/GUVI and DMSP/SSUSI-Operational Data Products for Space Weather Hsieh, Syau-Yun; Paxton, Larry; Zhang, Yongliang; Schaefer, Robert; DeMajistre, Robert; Wolven, Brian; Morrison, Daniel; Comberiate, Joseph; Kil, Hyosub; Published by: Published on: |
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