Reference : Doppler Profiles of Proton Auroral Emissions Derived From High Resolution FUV Spectra
Scientific congresses and symposiums : Unpublished conference
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/34034
Doppler Profiles of Proton Auroral Emissions Derived From High Resolution FUV Spectra
English
Chua, D. H. mailto [E. O. Hulbert Center for Space Research, Naval Research Laboratory, Code 7607 4555 Overlook Drive SW, Washington, DC 20375 United States ;]
Dymond, K. F. mailto [E. O. Hulbert Center for Space Research, Naval Research Laboratory, Code 7607 4555 Overlook Drive SW, Washington, DC 20375 United States ;]
Budzien, S. A. mailto [E. O. Hulbert Center for Space Research, Naval Research Laboratory, Code 7607 4555 Overlook Drive SW, Washington, DC 20375 United States ;]
McCoy, R. P. mailto [Office of Naval Research, Code 321SR, 800 N. Quincy Street, Arlington, VA 22217 United States ;]
Gérard, Jean-Claude mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
1-Dec-2002
No
No
International
AGU Fall meeting
AMerican Geophysical Union
[en] 2407 Auroral ionosphere (2704) ; 2427 Ionosphere/atmosphere interactions (0335) ; 2431 Ionosphere/magnetosphere interactions (2736) ; 2455 Particle precipitation ; 2736 Magnetosphere/ionosphere interactions
[en] In this paper we present new FUV observations of Doppler-shifted Lyman-ë± emissions from proton aurorae obtained from the High-resolution Ionospheric and Thermospheric Spectrograph (HITS) aboard the Advanced Research and Global Observation Satellite (ARGOS). The Doppler profiles of the Lyman-ë± auroral emissions serve as proxies for the energy spectra of precipitating protons in the ionosphere. These observations remedy two previous shortcomings in proton aurora studies. There have been few spectral measurements of Doppler-shifted H/H[SUP]+[/SUP] emission profiles with which to validate existing models of proton flux transport in the ionosphere. Even fewer are spectral measurements of this kind over large spatial scales that would extend our understanding of proton aurora to a global level. The HITS instrument observes the Doppler shifted H Lyman-ë± emissions from proton precipitation at 0.5 Ì· resolution over the width of the auroral oval traversed by the ARGOS spacecraft. The measured Doppler spectra of proton emissions are then modeled using a Monte Carlo simulation of proton flux transport. The model parameters which include the incoming proton energy, pitch angle, and energy flux distributions are adjusted until the predicted Lyman-ë± Doppler profiles match the observations. This technique allows us to quantify the evolution of proton precipitation during varying levels of auroral activity with both spectral information and large-scale spatial coverage. We present our analysis of proton auroral observations for an isolated substorm event as an example.
Researchers ; Professionals
http://hdl.handle.net/2268/34034
http://adsabs.harvard.edu/abs/2002AGUFMSA52A0397C

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