Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..104..321f&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 104, April 1986, p. 321-332. Research supported by the Ministry for Education and Science o
Physics
14
Solar Activity, Solar Corona, Solar X-Rays, Coronal Loops, Photosphere, Solar Flares
Scientific paper
The development of the giant flare coronal arch which appeared above AR 17255 on November 6, 1980 is studied using HXIS data. It is found that, over November 9-November 19 and in 3.5-8.0 keV X-rays, HXIS may have imaged a coronal loop interconnecting two active regions almost 30 deg apart. The X-ray intensity of this interconnecting loop was greatly variable and its intensity might have been related to flaring activity in the active regions. If so, then only some flares in active regions caused revivals of the interconnection. There is no evidence that these needed to be two-ribbon flares. The derived temperature was in the range 7.5-14 million K, and the electron density was 1.1-5.0 x 10 to the 9th/cu cm. The cooling of this interconnecting loop was much faster than the cooling of post-flare coronal arches, which indicates that heat conduction is also involved in the cooling process. This suggests a simpler magnetic field configuration in this structure than in the post-flare arches, which cool purely by radiation.
Farnik Frantisek
Svestka Zdenek
van Beek Frank H.
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