Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002kfnt...18..341g&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, v. 18, no. 4, p. 341-350
Physics
Scientific paper
We analyse observational data on radial velocities obtained from lines of different intensity in sunspots. The assumption was made that effective plasma diffusion in a sunspot umbra magnetic field takes place in the temperature minimum region. Above 90% of this plasma flow forms an observable downflow from the temperature minimum to the photosphere. The rest of the plasma flow forms the quasi-stationary flow directed upwards. There is possibly an acceleration of the plasma from 0.1km/s above the temperature minimum region up to 16-20 km/s in the chromosphere -- corona transition region above some sunspot umbrae. Coincidentally with its acceleration the plasma warms up from 3500 K in the temperature minimum region to 105 K in the region of the C IV λ 154.8 nm line formation. Such a pattern of changes in the plasma velocity and temperature with height is possible in the presence of an external field influencing the plasma. Intensity, energy, and their changes were estimated for the electromagnetic field which can produce the observable velocity and temperature of the plasma.
Gopasyuk O. S.
Gopasyuk S. I.
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