AN ORIGINAL CONTRIBUTION INSIDE THE WHOLE PICARD PROGRAM: THE MIRESOL INSTRUMENTATION

摘要

The MIRESOL program aims to automatically detect plages, faculae and spots at the solar limb, mainly in the CaII K line known to be very sensitive to the photospheric activity. This program is in accompagniment with the space PICARD mission whose one of the major goals is to accurately measure the diameter of the Sun, in any directions. Such measurements must be sorted according to spots or faculae which may occur at the solar limb. MIRESOL is complementary to other instruments forming a complete ground-based and space synergy around the scientific PICARD mission. The accurate determination of the heliographic latitude at limb where the spots (or faculae) begin and end is essential to separate diameters which are free from contamination. Their automatic detection and the development of an improved algorithm is a major point in the future analysis of the space data. We will first describe the whole program, including the cooperation with the PSPT network (Rome Astronomical Observatory and HAO-Boulder). We will then focus on the MIRESOL apparatus and we will present the results.