ar093.plunkett02 Posted: 18-May-96 Updated: Events specified: N/A
S.P. Plunkett (University of Birmingham, UK) and any interested members of the LASCO/EIT and SXT Science Teams.
The Large Angle and Spectroscopic Coronagraph (LASCO) instrument on the SOHO mission produces regular, high-quality images of the corona in visible light from 1.1-30 solar radii. Of particular interest for this project is the ability to measure profiles and intensities of several coronal emission lines in the inner corona (1.1-3.0 solar radii) using a tunable Fabry-Perot interferometer. The objective of this proposal is to compare the structures seen in the LASCO images with those observed in soft X-rays by the SXT. This would extend the work of Ichimoto et al. (1995a & 1995b), who studied two different active regions using a ground-based coronagraph in coordination with SXT, and should lead to an improved understanding of the thermal structure and evolution of the corona and the relationship between the hot (5 MK) and cool (1-2 MK) components.
Initially, the study should make use of the full-frame, desaturated SXT images (in the monthly SFM and weekly SFD files) and the data from the LASCO synoptic program. At a later stage, it might be desirable to organise a coordinated campaign dedicated to joint observations of a small number of selected structures. Images from the Extreme-Ultraviolet Imaging Telescope (EIT) on SOHO will also be very useful.
References:
Ichimoto, K. et al. 1995a, ApJ 445, 978-991. Ichimoto, K. et al. 1995b, PASJ, 47, 383-387.