The footpoints of giant arches

Details The footpoints of giant arches The footpoints of giant arches

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..124..339m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 124, no. 2, 1989, p. 339-352.

Physics

9

Chromosphere, Coronal Loops, Solar Corona, Solar Flares, Brightness Distribution, Fine Structure, H Alpha Line, Solar Magnetic Field, Solar Maximum Mission, X Ray Imagery

Scientific paper

H-alpha photographs are presented, which show chromospheric footpoints of the giant post-flare arches discovered by the Hard X-ray Imaging Spectrometer on the SMM satellite. The photographs display chromospheric signatures associated with five sequential giant arch events observed during November 6-10, 1980. The sets of footpoints at both ends of the arches have very slow brightness variations correlated in time with the brightness variations of the X-ray arches. The identifications of the two sets of footpoints is confirmed by current-free modeling of the coronal magnetic field (Kopp and Poletto, 1989). Possible explanations for the giant arch phenomenon are discussed.

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