Probing the solar wind acceleration region using spectroscopic techniques |
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Authors: | George L Withbroe John L Kohl Heinz Weiser Richard H Munro |
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Institution: | (1) Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass., USA;(2) High Altitude Observatory, Boulder, Colo., USA |
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Abstract: | Measurements of the intensities and profiles of UV and EUV spectral lines can provide a powerful tool for probing the physical conditions in the solar corona out to 8 R
and beyond. We discuss here how measurements of spectral line radiation in conjunction with measurements of the white light K-corona can provide information on electron, proton and ion temperatures and velocity distribution functions; densities; chemical abundances and mass flow velocities. Because of the fundamental importance of such information, we provide a comprehensive review of the formation of coronal resonance line radiation, with particular emphasis on the H i L line, and discuss observational considerations such as requirements for rejection of stray light and effects of emission from the geocorona and interplanetary dust. Finally, we summarize some results of coronal H i L and white light observations acquired on sounding rocket flights.Paper presented at the IX-th Lindau Workshop The Source Region of the Solar Wind. |
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