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Astron. Astrophys. 336, L57-L60 (1998)

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Letter to the Editor

The prolate solar chromosphere

F. Auchère 1, S. Boulade 2, S. Koutchmy 2, R.N. Smartt 3, J.P. Delaboudinière 1, A. Georgakilas 4, J.B. Gurman 5 and G.E. Artzner 1

1 Institut d'Astrophysique Spatiale, Bâtiment 121, Université Paris XI, F-91405 Orsay Cedex, France
2 Institut d'Astrophysique de Paris, 98 bis Boulevard Arago, F-75014 Paris, France
3 NSO/Sacramento Peak Observatory, Sunspot, NM 88349, USA
4 National Observatory, Athens, Greece
5 NASA/Goddard Space Flight Center, Greenbelt, MD, USA

Received 27 April 1998 / Accepted 18 June 1998


We present a comparative analysis of the chromospheric solar limb prolateness, using strictly simultaneous [FORMULA] ground-based observations and HeII space-based observations. The typical prolateness is found to be [FORMULA] in HeII and [FORMULA] in [FORMULA]. The first measurements in the 30.4 nm HeII line over a period of two years, as well as coronal data, are discussed to explore further the origin of the prolateness and its possible consequences.

Key words: Sun: chromosphere – corona

Send offprint requests to: F. Auchère

© European Southern Observatory (ESO) 1998

Online publication: July 27, 1998