Thermal structures associated with post-flare coronal arches

Details Thermal structures associated with post-flare coronal arches Thermal structures associated with post-flare coronal arches

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..108..315h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 108, no. 2, 1987, p. 315-331. Research supported by the Space Research Organization of the

Physics

18

Solar Corona, Solar Flares, Solar Temperature, Temperature Distribution, Brightness Distribution, Conductive Heat Transfer, Radiative Heat Transfer

Scientific paper

Shortly after the dynamic flare of 14:44 UT on 6 November, 1980, which initiated the second revival in the sequence of post-flare coronal arches of 6 - 7 November, a moving thermal disturbance was observed in the fine field of view of HXIS. Observations in the coarse field of view after 18 UT revealed a temperature maximum in the revived arch, rising with a velocity of 7.0 km s-1 directly in continuation of the thermal disturbance. The rise velocity of the disturbance was initially very similar to the rise velocities observed for the post-flare loop tops of the parent flare. It follows that in this phase the disturbed region is still a separate magnetic "island". After 18 UT the rise of the post-flare loop tops slowed down to 2 km s-1. Thus in this phase the Kopp and Pneuman (1976) mechanism is not directly responsible for the rise of the thermal structure and the rise possibly reflects the merging of the old and the new arch structures. A similar thermal disturbance was observed after the dynamical flare of 7:53 UT on 4 June, 1980. On the other hand, the confined flare of 17:25 UT on 6 November, 1980, did not show this phenomenon. Apparently this type of disturbance occurs after dynamic flares only, in particular when the flare is associated with an arch revival.

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