Solar arch filaments observed with THEMIS *
P. Mein 1,
C. Briand 2,1,
P. Heinzel 3 and
N. Mein 1
Received 28 September 1999 / Accepted 22 December 1999
Arch Filaments (AF) have been observed in the CaII 8542 Å line with the THEMIS telescope in September 1998. We present a preliminary analysis of MSDP spectro-imaging data. A cloud-model fit provides line-of-sight velocities and a set of plausible values for the model parameters. The high sensitivity of the filament opacity to temperature, coupled with the rough linearity versus electronic density, shows that this CaII line should be very efficient to complement usual H data for a more rigorous diagnostics.
Key words: Sun: chromosphere Sun: filaments line: profiles
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© European Southern Observatory (ESO) 2000
Online publication: March 21, 2000