Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.275...27k&link_type=abstract
In ESA, Proceedings of the 21st ESLAB Symposium on Small Scale Plasma Processes in the Solar Chromosphere/Corona, Interplanetary
Astronomy and Astrophysics
Astronomy
1
Chromosphere, Gas Flow, Solar Corona, Sunspots, Mass Flow, Rocket Flight, Spaceborne Astronomy, Spacelab Payloads, Supersonic Flow
Scientific paper
Gas flows in the transition region in and above sunspots were observed with the High Resolution Telescope and Spectrograph on two rocket flights and during the Spacelab 2 mission. Supersonic downflows of mass from the corona appear to be generally occurring in sunspots. The downflows are often concentrated in regions with typical diameters of 4000 km on the Sun, suggesting a flow in a looplike structure. However, the total flow pattern often has an elongated sheetlike structure of much larger extent. Flow speeds are typically 80 km/sec and show small variation with the temperature of the radiating gas. Much higher flow-speeds (180 km/sec) also occur. Studies of the areas surrounding the sunspot in the Spacelab material reveal the presence of upflows over extended regions with flow-speeds of 10 to 30 km/sec. It is not clear whether the amount of upward flowing gas is sufficient to compensate for the mass flux in the downflows.
Bartoe John-David F.
Brekke Paal
Brueckner Guenter E.
Brynildsen Nils
Kjeldseth-Moe Olav
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