Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...52...69s&link_type=abstract
Solar Physics, vol. 52, Apr. 1977, p. 69-90.
Astronomy and Astrophysics
Astronomy
36
Astronomical Photography, Lines Of Force, Solar Magnetic Field, X Ray Astronomy, Brightness, Conductive Heat Transfer, Electron Energy, Radiant Cooling, Solar Flares
Scientific paper
The paper reviews the life history of one transequatorial loop in a system observed in soft X-rays for at least 1.5 days and which interconnected a newly born active region with an old region. The birth of the selected loop is discussed along with properties of the interconnected active regions, sharpening and brightening of the loop, decay of the loop system, and physical relations between the interconnected regions. It is concluded that: (1) the loop was most probably born via reconnection of magnetic-field lines extending from the two active regions toward the equator, which occurred later than 33 hr after the younger region was born; (2) the fully developed interconnection was composed of several loops, all of which appeared to be rooted in a spotless magnetic hill of preceding northern polarity but were spread over two separate spotty regions of southern polarity in the magnetically complex new region; (3) the loop electron temperature increased from 2.1 million to 3.1 million K in one to three hours when the loop system brightened; and (4) the loops became twisted during the brightening, possibly due to their rise in the corona while remaining rooted in moving magnetic features in the younger region.
Chase Richard C.
Howard Ralph
Krieger Allen S.
Svestka Zdenek
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