The emerging magnetic flux and the elementary eruptive phenomenon

Details The emerging magnetic flux and the elementary eruptive phenomenon The emerging magnetic flux and the elementary eruptive phenomenon

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...87..309m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 87, Sept. 1983, p. 309-328.

Physics

28

Coronal Loops, Magnetic Flux, Solar Flares, Solar Spectra, Chromosphere, H Alpha Line, Morphology, Time Response

Scientific paper

The relations between different phases of the flare build-up were investigated using H-alpha observations of a large sample of elementary flares, both on the disk and along the limb of the sun. The concept of elementary eruptive phenomenon is developed to explain these observational data. It is proposed that the chromospheric eruptive phenomenon consists of two systems of loops: a cold loop (the surging arch with a temperature of about 10,000 K) and a hot loop (the flaring arch, covering a temperature range up to 10 to the 7th K). It is determined that the footpoints of the two systems remain differentiated until extinction of the phenomenon, as does their behavior over time. The surging arch is found to rise progressively in the solar atmosphere, while the upper part of the loop is heated to coronal temperatures. The classical surge, which is observed in the center of the H-alpha line after the flash phase of the flare, is shown to be the late development of the surging arch. A pre-existing low loop, which is able to rise in the solar atmosphere, is the basis for the origin of the flaring arch. It is determined that these two systems coexist and may combine to form physical characteristics such as mass motion, expansion, and the post-flash phase.

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