Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33b1768b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA33B-1768
Astronomy and Astrophysics
Astrophysics
[0328] Atmospheric Composition And Structure / Exosphere, [7538] Solar Physics, Astrophysics, And Astronomy / Solar Irradiance, [7549] Solar Physics, Astrophysics, And Astronomy / Ultraviolet Emissions
Scientific paper
The solar output in a broad spectral range, from X-rays to ultraviolet, significantly influences the distribution of hydrogen (H) atoms in the exosphere. All three populations—ballistic, satellite, and escaping atoms—are affected by solar radiation as it modifies the effective altitude and temperature of the exobase, controls to a large degree the dynamics of satellite atoms by radiation pressure, and contributes to atom losses. The Two Wide-angle imaging Neutral Atom Spectrometers (TWINS) mission stereoscopically images the magnetosphere in energetic neutral atom fluxes and additionally carries Lyman-alpha detectors (LADs) to investigate exospheric hydrogen. We use LAD measurements to obtain the global three-dimensional H distributions on a daily basis. The sequence of such distributions will enable studying of the exospheric response to the time-varying solar output. We show that the commonly used F10.7 index does not fully describe the solar conditions of importance to exospheric properties. We analyze the available indices F10.7, E10.7, S10.7, and Lyman-alpha which characterize the solar output from X-rays to ultraviolet. The characteristic times of processes governing atom injection, dynamics, and losses are different, which calls for the use of appropriate indices and their combinations. We discuss the available data sets, as well as the potential for study of exospheric response to variations in the solar output.
Bailey Jeremy
Gruntman Mike
Tobiska W.
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