The orientation of pre-transient coronal magnetic fields

Details The orientation of pre-transient coronal magnetic fields The orientation of pre-transient coronal magnetic fields

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980soph...68..177t&link_type=abstract

Solar Physics, vol. 68, Nov. 1980, p. 177-186.

Astronomy and Astrophysics

Astronomy

12

Coronal Loops, Solar Activity Effects, Solar Corona, Solar Magnetic Field, Solar X-Rays, Coronagraphs, Satellite Observation, Skylab Program, Solar Physics, Spaceborne Astronomy, Transient Response

Scientific paper

Loop-like white light coronal transients are generally believed to be nearly planar sheets which are thin compared to the loop extent; however, this picture may be questioned since virtually no observations (of the more than 100 transient events observed during the 1973-74 Skylab period) show such loops edge on. From the group of transient events studied by Munro et al. (1979) for which definite surface associations exist, it is found that loop transients are strongly correlated with filament regions where the filament axis was oriented north-south. From direct soft X-ray observations of an expanding arch, the possible identification of the soft X-ray signature of footpoints of transient loops, and monochromatic observations of low coronal loops it is inferred that loop-like coronal transients have their origin in low-lying coronal loops nearly co-planar with the north-south aligned filament axis. The situation with respect to nonloop events is less clear; such events apparently often arise from more complex filament geometries. Possible reasons for the preference of transients to arise from north-south filament-oriented regions are discussed.

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