Transient brightenings of interconnecting loops - Morphology of the sudden brightenings

Details Transient brightenings of interconnecting loops - Morphology of the sudden brightenings Transient brightenings of interconnecting loops - Morphology of the sudden brightenings

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...63..297s&link_type=abstract

Solar Physics, vol. 63, Sept. 1979, p. 297-318.

Physics

12

Loops, Magnetic Flux, Magnetohydrodynamics, Solar Activity, Solar Corona, Morphology, Skylab Program, Solar Flares, Time Lag, Transient Response

Scientific paper

Sudden brightenings of coronal loops that interconnect active regions are studied. Such brightenings often occur within one or two days after the birth of a new interconnecting loop, as well as in some old interconnections. The brightenings of young loops are obviously associated with the emergence of new magnetic flux near their footpoints, whereas some enhancements of old loops may be triggered by slowly moving disturbances propagating from other centers of activity. A few loop brightenings are associated with flares, but the loop does not brighten in consequence of the energy supply from the flare. Both the flare and the loop brightening are independent consequences of one common agent, presumably newly emerging flux. Temperatures in brightened loops are between 3 and 4 x 10 to the 6th K and densities are less than 2 x 10 to the 9th/cu cm, probably less than 5 x 10 to the 8th/cu cm in some old loops. The top part of a loop is the site of the most intense brightening in the initial phase of a loop enhancement. The most frequent lifetime of these brightenings is 6 to 7 hr.

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