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Astron. Astrophys. 334, 1095-1098 (1998)

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Solar HI Lyman [FORMULA] full disk profile obtained with the SUMER/SOHO spectrometer

P. Lemaire 1, C. Emerich 1, W. Curdt 2, U. Schühle 2 and K. Wilhelm 2

1 Institut d'Astrophysique Spatiale, Unité Mixte CNRS - Université de Paris XI, Bat 121, F-91405 Orsay, France
2 Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany

Received 13 February 1998 / Accepted 5 March 1998


An uncalibrated solar hydrogen Lyman [FORMULA] profile was obtained with the use of the spectrometer on SOHO. The collection of the light scattered by the telescope permitted to average the profile over the full solar disk. The profile taken at the L1 Sun-Earth Lagrangian position is free of the central geocoronal absorption.
Then, taking advantage of the absolute flux measured by the SOLSTICE/UARS spectrometer, an absolute line profile intensity is derived, and is compared with previous observations at minimum solar activity.

Key words: Sun: chromosphere – Sun: UV radiation – line profiles

Send offprint requests to: P. Lemaire, (Lemaire@iaslab.ias.fr)

© European Southern Observatory (ESO) 1998

Online publication: June 2, 1998