Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spro.proc...25k&link_type=abstract
Solar Physics with Radio Observations, Proceedings of the Nobeyama Symposium, held in Kiyosato, Japan, Oct. 27-30, 1998, Edited
Physics
Scientific paper
Sensitive observations of the quiet Sun provided by (1) the SXT on board the Yohkoh satellite, (2) the EIT on board the SoHO spacecraft in high-temperature iron line emission, and (3) the Very Large Array (VLA) in the centimeter radio range are investigated in view of the coronal heating problem. The observed enhancements in coronal emission measure are interpreted as heating events (microflares) bringing chromospheric material to coronal temperatures, whereas the radio observations show the existence of non-thermal emission related to some of these heating events. Assuming an effective height of 5000~km, the thermal energy inputs by such microflares have been found in the range from 8× 1024 erg to 1.6× 1026 erg, and the total energy input amounts to about 16% of the average radiated power of the coronal plasma in the quiet corona. The frequency distribution of microflares is an approximate power-law of the form f(E) = f0 E-δ with a power-law index δ between 2.3 and 2.6. As the low-energy cutoff is due to sensitivity limitations and the power-law index is steeper than 2, these observations demonstrate the possibility that microflares dominate the energy input into the quiet corona.
Benz Arnold O.
Krucker Sa"m
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