München 2019 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 9: Poster

EP 9.11: Poster

Donnerstag, 21. März 2019, 16:30–19:00, Durchgangshalle

FitCoPI: Fitting density and temperature of coronal active region plasma in 3D from single vantage point observations — •Stephan Barra — MPI für Sonnensystemforschung, Göttingen — Ruhr-Universität Bochum, Theoretische Physik IV, Bochum

Since the solar coronal plasma is optically thin, diagnostics of coronal plasma basically have no resolution along the line of sight. So far, this problem can be overcome only either by stereoscopic observations, or by observing the sun repetitively with enough time lag. The former approach has the problem that STEREO data is not generally available. The latter one suffers from poor time resolution, since the sun needs to rotate until the perspective changes significantly.

We present our newly developed FitCoPI code. It implements a novel method of fitting the solar active region corona to single vantage point observations. The method requires a set of simultaneous EUV or X-ray images. The outcome is an 3D approximation of the density and temperature in the corona. The method is tested against a model corona. Using SDO/AIA data, it is further applied to AR 11087, observed on July 15th 2010, for which the results can be tested against independent data from STEREO A/EUVI. In both cases, the results are very satisfying, though some problems remain near the solar surface.