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The Twins Exospheric Neutral H-density Distribution Under Solar Minimum Conditions : Volume 29, Issue 12 (01/12/2011)

By Zoennchen, J. H.

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Book Id: WPLBN0003991555
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File Size: Pages 7
Reproduction Date: 2015

Title: The Twins Exospheric Neutral H-density Distribution Under Solar Minimum Conditions : Volume 29, Issue 12 (01/12/2011)  
Author: Zoennchen, J. H.
Volume: Vol. 29, Issue 12
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Zoennchen, J. H., Fahr, H. J., Nass, U., Gruntman, M., Goldstein, J., & Bailey, J. J. (2011). The Twins Exospheric Neutral H-density Distribution Under Solar Minimum Conditions : Volume 29, Issue 12 (01/12/2011). Retrieved from

Description: Argelander Institut für Astronomie, Astrophysics Department, University of Bonn, Auf dem Huegel 71, 53121 Bonn, Germany. 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.

The TWINS exospheric neutral H-density distribution under solar minimum conditions

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