Flare loops destabilization and expansion during the April 2, 2001 flare

Details Flare loops destabilization and expansion during the April 2, 2001 flare Flare loops destabilization and expansion during the April 2, 2001 flare

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..469k&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Computer Science

1

Solar Flare, Magnetic Field

Scientific paper

An evolution of the flare loops observed in TRACE 171 Å line, 1600 Å continuum and Hα line (Modra Observatory) during the C8.5/1F, April 2, 2001 flare is analyzed. The expansion of the flare loops at their tops is recognized co-spatially at the hot (TRACE 171 Å, 0.9 MK) as well as cold (Hα and 1600 Å, 0.01 - 0.02 MK) lines. The loop expansion started after an injection of the cold plasma into the loops. At some parts of the expanding loops helical features were found. At space of loop footpoints the umbrella handle shape features can be seen. It was found that these structures are 3-dimensional ones, i.e. not only layers in the chromosphere. Such an interpretation demands relatively high plasma densities (~1012 cm-3) in these structures due to their visibility in emission against the disc in the Hα. Furthermore the linear bright structure, perpendicular to the global magnetic field of the expanding loops, was observed. To understand the whole process under the study, the observed structures are compared with those extrapolated in the potential magnetic field approximation. A possible role of the "ballooning" instability, destabilizing the loops, is discussed.

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