Formation and cooling of the giant HXIS arches of November 6-7, 1980

Details Formation and cooling of the giant HXIS arches of November 6-7, 1980 Formation and cooling of the giant HXIS arches of November 6-7, 1980

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..127..267k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 127, June 1990, p. 267-280. Research supported by ASI.

Physics

14

Arches, Coronal Loops, Magnetic Field Reconnection, Solar Flares, Chromosphere, Energy Dissipation, Magnetic Field Configurations, Radiant Cooling, Thermal Energy

Scientific paper

Giant arches, first detected by the HXIS instrument aboard SMM, are still a poorly understood component of the flare scenario. The purpose of the present paper is to analyze the giant arches imaged on November 6-7, 1980, which, in contrast to that observed on May 21, 1980, were not stationary and had shorter cooling times. A procedure applied to the May 21 case was used to compute the three-dimensional topology of the magnetic field which forms by reconnection over the active region containing the November arches. This technique makes it possible to verify that the observed structures are aligned with the computed field lines, lending support to the hypothesis that they originate through a reconnection process which occurs at progressively larger altitudes. A calculation of the magnetic energy liberated by reconnection shows that enough energy may be thereby released to account for the observed thermal energy enhancement of the HXIS arches. The lifetime of the features is shown to be consistent with that predicted by cooling via radiation and field-aligned conduction to the underlying chromosphere.

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