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EP: Fachverband Extraterrestrische Physik
EP 3: Sun and Heliosphere I - Structure (MHD, Corona, TR, SW-acc.-Region)
EP 3.7: Vortrag
Dienstag, 20. März 2018, 18:15–18:30, BSZ - Pabel HS
Doppler Spectroscopy for the Determination of Speeds and Temperatures in Solar Eruptions — •Adalbert Ding1,2 and Shadia Rifai Habbal3 — 1Institut für Technische Physik, Berlin — 2Institut für Optik und Atomare Physik, Technische Universität Berlin — 3Institute for Astronomy, University of Hawaii, USA
Eruptions from the Solar surface (CMEs, prominences, flares) are events which provide valuable information about the dynamics of the plasma processes at the Sun’s surface and in the Solar corona. Using high resolution dual and triple channel partially multiplexed imaging spectrometers (PAMIS) the composition of the particles involved, their speed and their temperature could be determined with outstanding accuracy. We present spectroscopic observations acquired during the 20. March 2015 and the 21. August 2017 total solar eclipses which captured Fe XIV emission from very hot (appr. 2 x 106 K) plasmoids in some cases enshrouding a core of relatively cold (< 2 x 105 K) neutral and singly ionized atoms as well as H and He emission from prominences detaching from the Solar surface. Speeds between 100 and 1500 km/s and temperatures as high as 2 x 106 K of the particles have been obtained in both instances by measuring the Doppler shift and the Doppler broadening of the relevant emission lines. The present observations explore the most critical region of the Solar corona, namely the acceleration region of the Solar wind which is currently untenable from any other platform or instruments.