Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30ssc10c&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 18, pp. SSC 10-1, CiteID 1948, DOI 10.1029/2003GL017830
Physics
Atmospheric Composition And Structure: Thermosphere-Energy Deposition, Ionosphere: Auroral Ionosphere (2704), Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Particle Precipitation
Scientific paper
We present new FUV observations of Doppler-shifted Lyman-α 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-α emissions from proton precipitation with 1.5 Å resolution. The high spectral resolution of these measurements allows the auroral Lyman-α 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-α 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.
Bisikalo Dmitry
Budzien Scott A.
Chua Damien H.
Coumans Valérie
Dymond Ken F.
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