The Global Activity of the Solar Corona

Details The Global Activity of the Solar Corona The Global Activity of the Solar Corona

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..441l&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

The question of the global activity of the solar corona, as a function of time and distance from the center of the Sun, is considered by analyzing long time-series of LASCO-C2 images. Polarized images are first considered to perform the separation of the K and F components. The F-corona images are used to construct a photometric model of the F-corona wich reflects its annual variations resulting from geometric effects. This time-varying model is then subtracted from all corrected and calibrated images (unpolarized) to yield images of the K-corona. Synoptic maps are created at different distances between 2.5 and 6 solar radii and the total white-light intensity is integrated to estimate the total mass of the corona. Its variations in the range of heliocentric distance and over a time span of 3 years will be presented and discussed.

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