Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...659l.181w&link_type=abstract
The Astrophysical Journal, Volume 659, Issue 2, pp. L181-L184.
Astronomy and Astrophysics
Astronomy
9
Plasmas, Sun: Chromosphere, Sun: Sunspots, Waves
Scientific paper
Sunspot atmospheric models show that sunspots have a higher temperature than the surrounding quiet Sun in the upper chromosphere, although they are dark in the photosphere. This Letter presents a comparison between acoustic wave heating and kinetic Alfvén wave (KAW) heating in sunspots from the photosphere through the chromosphere based on a semiempirical model calculated by non-LTE procedure. The result suggests that acoustic wave heating is still a possible dominating mechanism in the photosphere and in the lower chromosphere below 850 km, similar to previous works. But in the upper chromosphere above 850 km, KAW heating is a more promising candidate that dominates sunspot chromospheric heating. We speculate that this probably relates to the ionization exceeding one in a thousand in the upper chromosphere, so that the plasma processes such as KAW dissipation play an important role in the atmospheric dynamics.
Fang Chen
Wu Dei-Jin
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