[en] We present new FUV observations of Doppler-shifted Lyman-alpha emissions from proton aurora obtained from the High Resolution Ionospheric and Thermospheric Spectrograph ( HITS) aboard the Advanced Research and Global Observation Satellite (ARGOS). The HITS instrument observes the Doppler-shifted H Lyman-alpha emissions from proton precipitation with 1.5 Angstrom resolution. The high spectral resolution of these measurements allows the auroral Lyman-alpha emissions to be separated from the intense geocoronal background. The measured proton aurora Doppler spectra are modeled using a Monte Carlo simulation of proton flux transport. The forward modeling performed with this code allows us to infer the characteristic energies of the incident protons from the measured Lyman-alpha Doppler spectra. The inferred characteristics of dayside versus nightside proton precipitation are compared and used to identify the magnetospheric regions from which the particles likely originated.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Coumans, Valérie ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Bisikalo, D.
Shematovich, V.
Language :
English
Title :
High resolution FUV observations of proton aurora
Publication date :
24 September 2003
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
Amer Geophysical Union, Washington, United States - District of Columbia
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Bibliography
Frey, H. U., S. B. Mende, T. J. Immel, S. A. Fuselier, E. S. Claflin, J.-C. Gérard, and B. Hubert, Proton aurora in the cusp, J. Geophys. Res., 107(A7), 1091, doi:10.1029/2001JA900161, 2002.
Gérard, J.-C., B. Hubert, D. V. Bisikalo, and V. I. Shematovich, A model of the Lyman-α profile in the proton aurora, J. Geophys. Res., 105, 15,795, 2000.
Gvozdevsky, B. B., V. A. Sergeev, and K. Mursula, Long lasting energetic proton precipitation in the inner magnetosphere after substorms, J. Geophys. Res., 102, 24,333, 1997.
Hedin, A. E., Extension of the MSIS thermosphere model into the middle and lower atmosphere, J. Geophys. Res., 96, 1159, 1991.
Lummerzheim, D., and M. Galand, The profile of the hydrogen Hβ emission line in proton aurora, J. Geophys. Res., 106, 23, 2001.
Mende, S. B., et al., Far ultraviolet imaging from the IMAGE spacecraft: 3. Spectral imaging of Lyman alpha and OI 135.6 nm, Space Sci. Rev., 91, 287, 2000.
Richmond, A. D., Ionospheric electrodynamics using magnetic apex coordinates, J. Geomag. Geoelectr., 47, 191, 1995.
Sergeev, V. A., E. M. Sazhina, N. A. Tsyganenko, J. Å. Lundblad, and F. Søraas. Pitch angle scattering of energetic protons in the magnetotail current sheet as the dominant source of their isotropic precipitation into the nightside ionosphere, Planet. Spa. Sci., 31, 1147, 1983.
Vegard, L., Hydrogen showers in the auroral region, Nature. 144, 1089, 1939.
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