期刊
ANNALES GEOPHYSICAE
卷 29, 期 12, 页码 2211-2217出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-29-2211-2011
关键词
Atmospheric composition and structure; Airglow and aurora; Pressure, density, and temperature; Meteorology and atmospheric dynamics; Thermospheric dynamics
资金
- DLR [FKZ 50 OE 0901]
- NASA TWINS mission
- Northrop Grumman fellowship
Terrestrial exospheric atomic hydrogen (H) resonantly scatters solar Lyman-alpha (121.567 nm) radiation, observed as the glow of the H-geocorona. The Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) satellites are equiped with two Lyman-alpha line-of-sight Detectors (LADs) each. Since during the past solar minimum conditions the relevant solar control parameters practically did not vary, we are using LAD data between June and September 2008 to create a time averaged hydrogen geocorona model representative for these solar minimum conditions. In this averaged model we assume that the H-geocorona is longitudinally symmetric with respect to the earth-sun line. We find a 3-dimensional H-density distribution in the range from 3 to 8 earth radii which with some caution can also be extrapolated to larger distances. For lower geocentric distances than 3 earth radii a best fitting r-dependent Chamberlain (1963)-like model is adapted. Main findings are larger than conventionally expected H-densities at heights above 5 R-E and a pronounced day-to-night side H-density asymmetry. The H-geocorona presented here should serve as a reference H-atmosphere for the earth during solar minimum conditions.
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