Résumé / Abstract Journal-club_Postdoc

Journal-club Postdoc

« Solar limb structuration and low altitude regions analysed using total solar eclipses »

Cyril Bazin

In this talk I introduce my work on the solar transition region from the photosphere - chromosphere to the corona interface, by using total solar eclipses and spaceborne data. In the first part, a slitless fast CCD spectroscopy method using the Moon as a natural occultation will be presented for recording the many emissions lines and also a chronodating technique at the contacts instants: 10 seconds before and after the totality phase, and the complexity of the solar limb at eclipses conditions, without parasitic scattered light. Then the analysis of light curves of several low First Ionisation Potential (FIP) elements (Fe II, Ti II..) are given to deduce some structuration in the temperature minimum regions (from 200 to 600 km above the limb) where the bifurcation between the continuum and low FIP elements begins. The continuum between the low FIP lines is analysed for defining the solar edge in the 470 nm spectral region as well as the helium emission shells (high FIP lines) extensions, and simultaneously Extreme UV images of the 2MK corona from spaceborne instruments. The contribution of these data are discussed to some future analysis of spicules and interspicular regions, the role of the fields for driving the plasma and the next experiments for the forthcoming total solar eclipses.
mardi 24 novembre 2015 - 11:00
Salle des séminaires Évry Schatzman, Institut d'Astrophysique
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