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How Does the Solar Chromospheric Activity Look Like Under Different Inclination Angles? by Broeck, G. Vanden; Bechet, S.; Rauw, G.; Clette, F. is a scholarly article available to read on EtoBox.

What is How Does the Solar Chromospheric Activity Look Like Under Different Inclination Angles? about?

Chromospheric plages are distributed between mid-latitude and the Equator and never close to the Poles. Therefore, we suspect that the inclination angle of the solar rotation axis has an impact on the observable chromospheric emission. We reproduce the solar images from any inclination in order to study the effect of the inclination axis on the solar variability by using direct observations of the Sun in the Ca II K line. More than 2700 days of observations since the beginning of the Ca II K observations with USET, in July 2012, were used in our analysis. For each observation day, we produce synoptic maps to map the entire solar surface during a full solar rotation. Then by choosing a given inclination, we generate solar-disk views, representing the segmented brightest structures of the chromosphere (plages and enhanced network), as seen under this inclination. The area fraction are extracted from the masks for each inclination and we compare the evolution of those time series to quantify the impact of the inclination angle. We find a variation of the area fraction between an Equator-on view and a Pole-on view. Our results show an important impact of the viewing angle on the detect

Author

Broeck, G. Vanden; Bechet, S.; Rauw, G.; Clette, F.

Published

2024

Language

EN