Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21a..02o&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM21A-02
Physics
2794 Instruments And Techniques, 2799 General Or Miscellaneous, 0399 General Or Miscellaneous
Scientific paper
The geocorona is produced when solar Lyman α radiation is resonance scattered by neutral hydrogen in the exosphere. Measurements of the geocoronal brightness from space can therefore be used to derive the density profile of neutral hydrogen sorrounding the Earth. The Geocorononal Imager (GEO) which is part of the FUV imaging system onboard the IMAGE satellite, is designed to measure the geocoronal Lyman α emissions. In this paper we present radial density profiles of the neutral hydrogen in the magnetosphere derived from the GEO data of Lyman α column brightness. The variable solar Lyman α flux is obtained from the UARS/SOLSTICE measurements and the scattered solar Lyman α emissions from interplanetary hydrogen is obtained from a model. At high altitudes (>3RE) we assume that the exosphere can be considered as an optical thin medium. Assuming that the hydrogen density profile can be expressed as a double exponential it is shown that the Lyman α column brightness can be converted to hydrogen density profiles in each local time sector. Our results show the same shape but indicate higher hydrogen density >5RE than has been reported earlier. Our results are valid >3RE.
Frey Harald U.
Gladstone Randy
Mende Stephen B.
Ostgaard Nikolai
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