Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.91c&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
We study the emission of the hydrogen Lyman-alpha line in the quiet Sun, its center-to-limb variation, and its radiance distribution, which we also compare to the Lyman-beta line. We use the high spectral and spatial resolution of the SUMER spectrometer and take raster scans at various locations on the disk. For the first time, we have used a new method to reduce the incoming photon flux to a 20%-level by partly closing the aperture door. We also performed a quasi-simultaneous observation of both Ly-a and Ly-b at Sun centre in sit-and-stare mode. We deduce the flow characteristic in Ly-a map from variations of the calibrated Si III line centroids. We present the average profile of Ly-a, its radiance distribution, its center-to-limb behaviour, and the signature of flows on the line profiles. Different from all other lines of the Lyman series, which have a red-horn asymmetry, Ly-a has a robust and dominating blue-horn asymmetry. To our knowledge, this result is only predicted by models which include flows.
Curdt Werner
Lemaire Philippe
Schühle Udo
Teriaca Luca
Tian Hanqin
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