The prolate solar chromosphere

TitreThe prolate solar chromosphere
Type de publicationJournal Article
Year of Publication1998
AuteursAuchère, F., Boulade S., Koutchmy S., Smartt R. N., Delaboudinière J. P., Georgakilas A., Gurman J. B., and Artzner G. E.
JournalAstronomy and Astrophysics
Date PublishedAug

We present a comparative analysis of the chromospheric solar limb prolateness, using strictly simultaneous H\_alpha ground-based observations and Heriptsize$\{$II$\}$ space-based observations. The typical prolateness is found to be Delta D/D=5.5*E(-3) in Heriptsize$\{$II$\}$ and 1.2*E(-3) in H\_alpha . The first measurements in the 30.4 nm Heriptsize$\{$II$\}$ 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.