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Gas flows in the transition region above sunspots
Kjeldseth-Moe, O.; Brynildsen, N.; Brekke, P.; Engvold, O.; Maltby, P.; Bartoe, J.-D. F.; Brueckner, G. E.; Cook, J. W.; Dere, K. P.; Socker, D. G.
AA(Oslo, Universitetet, Norway), AB(Oslo, Universitetet, Norway), AC(Oslo, Universitetet, Norway), AD(Oslo, Universitetet, Norway), AE(Oslo, Universitetet, Norway)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 1066-1075. NASA-supported research; Norges Almenvitenskapelige Forskningsrad. (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Gas Flow, Solar Atmosphere, Solar Spectra, Sunspots, Transition Points, Flow Velocity, Line Of Sight, Solar Magnetic Field, Spectral Line Width
Bibliographic Code:


Strong downflows and moderate upflows in the transition region over a sunspot have been observed with the HRTS on Spacelab 2 in 1985. The flows are persistent in the sense that they are seen in the same spot for 5 days. The downflows are prominent in regions of limited extent (4arcsec - 6arcsec), and flow velocities are in the range 40 - 80 km s-1 and are thus supersonic. Upward flows have smaller velocities, 5 - 20 km s-1, but may extend over a larger area. In the downflowing regions there is always an appreciable amount of gas at rest in the line of sight. Flow speeds derived from the profiles of different lines formed in the transition region between 30,000 and 230,000K are very similar implying constant downflow in this temperature range.

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