Mass transport above sunspots |
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| Authors: | N Brynildsen O Kjeldseth-Moe G E Brueckner |
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| Institution: | (1) Institute of Theoretical Astrophysics, University of Oslo, Blindern, Norway;(2) E. O. Hulburt Center for Space Research, US Naval Research Laboratory, Washington DC, U.S.A. |
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| Abstract: | Mass transport in the transition zone above a sunspot has been studied in theCiv line at 1548 Å, formed at 100 000 K. Four spectral rasters have been used, each covering 60×50 are sec. These have been observed with the High Resolution Telescope and Spectrograph during the Spacelab-2 mission in 1985.Flow velocities are derived from multiple Gaussian components fitted to the observed line intensity profiles. Density sensitive lines were used to find a relation between theCiv line intensity and the particle density. This relation is used in the mass flux calculations. The investigation indicates a clear net downward mass flux above sunspots.Paper presented at the 11th European Regional Astronomical Meetings of the IAU on  New Windows to the Universe, held 3–8 July, 1989, Tenerife, Canary Islands, Spain. |
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