Physics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..443..173k&link_type=abstract
Atomic processes in plasmas. AIP Conference Proceedings, Volume 443, pp. 173-184 (1998).
Physics
Solar Electromagnetic Emission, Photon Interactions With Atoms, Ultraviolet
Scientific paper
Many aspects of the Sun's corona and wind are studied using data from the ultraviolet spectrum. Accurate atomic parameters are needed to interpret these data correctly, and a good understanding of the behaviors of atoms and ions in plasmas is essential to modeling the Sun's atmosphere. Here I present two examples of studies being carried out using the Solar and Heliospheric Observatory (SOHO) extreme ultraviolet spectrographs. The first of these is the study of flows in the Sun's chromosphere and corona. SOHO has provided new information concerning previous observations of the predominant down-flows in the Sun's lower atmosphere. Accurate measurements of Doppler line shifts have been extended to the corona. It has also been found that the Doppler shifts vary over different parts of the Sun. The second study discussed involves the use of SOHO data to measure elemental abundances in coronal structures know as streamers, giving more information on the ``FIP'' effect-the observation that there is a relative deficit of elements with high first ionization potentials (FIPs) in the corona and solar wind.
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