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| Titel |
The TWINS exospheric neutral H-density distribution under solar minimum conditions |
| VerfasserIn |
J. H. Zoennchen, J. J. Bailey, U. Nass, M. Gruntman, H. J. Fahr  , J. Goldstein |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 12 ; Nr. 29, no. 12 (2011-12-01), S.2211-2217 |
| Datensatznummer |
250017138
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| Publikation (Nr.) |
 copernicus.org/angeo-29-2211-2011.pdf |
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| Zusammenfassung |
| Terrestrial exospheric atomic hydrogen (H) resonantly
scatters solar Lyman-α (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-α 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 RE 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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