Optimization of the METIS on-board algorithm for the automatic detection of Coronal Mass Ejections
Date Issued
2021
Author(s)
Abstract
The Solar Orbiter-METIS on-board algorithm for the automated detection of Coronal Mass Ejections and the release of a “CME flag” has been tested and optimized based on the analysis of data acquired by the STEREO-COR1 and COR2 coronagraphs. The polarized images by STEREO acquired with 3 different orientations of the linear polarizer have been combined and analysed to reconstruct the polarized sequences that will be acquired by METIS with 4 different polarization angles. The images have been then divided into 8 angular sectors, to simulate the lightcurves and normalized running differences that will be measured by METIS. For the derivation of lightcurves, different circular crown areas with different radial extensions have been considered, in order to define the optimal interval. Results show that the on-board algorithms will be able to successfully identify the occurrence of CMEs at both heliocentric distances of 0.28 AU and 0.72 AU. Among possible different areas, for optimal operations of this algorithm it is suggested to employ circular crown areas centred over the inner fraction of the instrument field of view, and possibly with smaller radial extensions. The work described here was performed in 2015 for a triennial Degree Thesis in Physics at Turin University Physics Department.
Report number
72
Rights
open.access
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METIS_CMEalgo_optimization_techrep.pdf
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