Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Poster: Precision spectroscopy of atoms and ions (with Q)
A 20.20: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
Investigation of the structure of the solar corona by imaging spectroscopy — •Adalbert Ding1,2 and Shadia Rifai Habbal3 — 1Institut für Optik und Atomare Physik, TU Berlin — 2Institut für Technische Physik, Berlin — 3Institute for Astronomy, University of Hawaii, Honolulu, USA
The emission of highly ionized Fe atoms in the solar corona has been investigated during the solar eclipses of 2010 (in French Polynesia)and 2012 (in Northern Australia)using wavelength selected imaging techniques. In particular, two imaging spectrometers have been used to record the solar emission spectrum along a line transversing the corona over several solar radii thereby obtaining the relative intensities of all relevant emission lines. Besides the intense Hydrogen, Helium and Calcium lines, emission from optically forbidden transitions of a number of Fe ions (Fe9+: 637.4 nm, Fe13+: 530.3 nm) were observed.
During the 2012 solar eclipse an improved high resolution double spectrometer was used to measure the Doppler broadening of 2 emission lines (Fe9+, Fe13+).
The results are compared with the 2D visible emission profiles of a number optically forbidden transitions using narrow band interference filters 1)
The data provide information about the electron temperature distribution in different coronal structures and the excitation mechanisms of the ions.
1) S.R. Habbal et al., APJ 734, 120 (2011)