An empirical model of the variation of the solar Lyman-α spectral irradiance

Matthieu Kretzschmar; Martin Snow; Werner Curdt

An empirical model of the variation of the solar Lyman-α spectral irradiance

Matthieu Kretzschmar ¹ Martin Snow ² Werner Curdt ³

1 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace

2 LASP - Laboratory for Atmospheric and Space Physics [Boulder]

3 MPS - Max-Planck-Institut für Sonnensystemforschung

Abstract : We propose a simple model that computes the spectral profile of the solar irradiance in the hydrogen Lyman alpha line, H Ly-α(121.567nm), from 1947 to present. Such a model is relevant for the study of many astronomical environments, from planetary atmospheres to interplanetary medium. This empirical model is based on the SOHO/SUMER observations of the Ly-α irradiance over Solar Cycle 23 and the Ly-α disk-integrated irradiance composite. The model reproduces the temporal variability of the spectral profile and matches the independent SORCE/SOLSTICE spectral observations from 2003 to 2007 with an accuracy better than 10%.

Document type :

Journal articles

Domain :

Sciences of the Universe [physics] / Earth Sciences / Geophysics [physics.geo-ph]

Physics [physics] / Physics [physics] / Space Physics [physics.space-ph]

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An empirical model of the variation of the solar Lyman-α spectral irradiance

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An empirical model of the variation of the solar Lyman-α spectral irradiance

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