An Empirical Model of the Variation of the Solar Lyman‐ α  Spectral Irradiance | Zendy

Kretzschmar Matthieu | Zendy; Snow Martin | Zendy; Curdt Werner | Zendy

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An Empirical Model of the Variation of the Solar Lyman‐ α Spectral Irradiance

Author(s) -

Kretzschmar Matthieu,

Snow Martin,

Curdt Werner

Publication year - 2018

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1002/2017gl076318

Subject(s) - irradiance , solar irradiance , physics , solar maximum , observatory , atmospheric sciences , solar cycle , radiation , environmental science , astronomy , astrophysics , optics , solar wind , plasma , quantum mechanics

We propose a simple model that computes the spectral profile of the solar irradiance in the hydrogen Lyman alpha line, H Ly‐ α (121.567 nm), 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 SOlar Heliospheric Observatory/Solar Ultraviolet Measurement of Emitted Radiation 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 SOlar Radiation and Climate Experiment/SOLar‐STellar Irradiance Comparison Experiment spectral observations from 2003 to 2007 with an accuracy better than 10%.

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