The solar hydrogen Lyman α to Lyman β line ratio
Titre | The solar hydrogen Lyman α to Lyman β line ratio |
Type de publication | Journal Article |
Year of Publication | 2012 |
Auteurs | Lemaire, P., Vial J.-C., Curdt W., Schühle U., and Woods T. N. |
Journal | Astronomy and Astrophysics |
Volume | 542 |
Pagination | L25 |
Date Published | Jun |
Résumé | Aims: We investigate the variation in the solar hydrogen Lyman α (Lyα) to Lyman β (Lyβ) line ratio as a function of the solar activity by taking into account new results obtained by SoHO/SUMER and TIMED/SEE. Methods: We reanalyze data of quiet and active regions previously collected with the LPSP multichannel instrument on OSO8. We then re-examine data obtained on the solar disk with SUMER and compare them with previous data. In a second step, we use the full Sun H i Lyβ profiles to determine the Lyβ contribution to the SEE profiles obtained with a 0.4 nm full width at half-maximum. The variation in the Lyα to Lyβ line ratio is then measured for part of the solar cycle 23 (2002-2008). Results: We determine the radiance line ratio of the solar H i Lyα to Lyβ line for a quiet Sun area and the relation between the ratio of the Lyα to Lyβ irradiance and the Lyα solar irradiance. |
DOI | 10.1051/0004-6361/201219026 |
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