Evolution of the Loop Top Source of Solar Flares --- Heating and Cooling Processes

Details Evolution of the Loop Top Source of Solar Flares --- Heating and Cooling Processes Evolution of the Loop Top Source of Solar Flares --- Heating and Cooling Processes

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.9805j&link_type=abstract

American Astronomical Society Meeting 204, #98.05; Bulletin of the American Astronomical Society, Vol. 36, p.985

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a study of the spectral evolution of the loop top (LT) sources of a sample of solar flares observed by RHESSI. Distinct LT sources are seen in many flares from the pre-heating to the decay phase. In most cases, their spectrum can be fitted with either a thermal or a power law model. The spectra of preheating phase are somewhat complex. While the impulsive phase spectra seem fit a power law better. The LT source in decay phase can be well described as a thermal source. The temperature obtained from the thermal fit decays 10 times faster than that expected from radiative cooling but 10 times slower than that due to conduction cooling along the loops. This can come about as a combined result of continuous heating and suppression of conductivity along the loop. Both these effects can be produced by turbulence. Implication of this process as the so-called Neupert effects will also be discussed.

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