Thermal Evolution of Coronal Active Regions

Details Thermal Evolution of Coronal Active Regions Thermal Evolution of Coronal Active Regions

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spro.proc...99y&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

We study the thermal evolution of active regions in the corona by analyzing 51 emerging flux regions (EFRs) observed with the soft X-ray telescope aboard Yohkoh. We derive the mean temperature and pressure of active regions as a function of time using the filter ratio technique, and found that the mean temperature increases with its expansion. We also studied the relationship between the region size and the temperature, and found that the temperature (T) and the pressure (P) of EFRs increase with increasing region size (L); T ∝ L0.42, P ∝ L0.25. The relation between pressure and region size, however, is strongly influenced by the assumption of the region's thickness along the line of sight.

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