Large-Scale Active Coronal Phenomena in YOHKOH SXT Images II. Stationary Post-Flare Giant Arches Frantisek Farnik, Zdenek Svestka, Hugh S. Hudson,

Details Large-Scale Active Coronal Phenomena in YOHKOH SXT Images II. Stationary Post-Flare Giant Arches Frantisek Farnik, Zdenek Svestka, Hugh S. Hudson, Large-Scale Active Coronal Phenomena in YOHKOH SXT Images II. Stationary Post-Flare Giant Arches Frantisek Farnik, Zdenek Svestka, Hugh S. Hudson,

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..168..331u&link_type=abstract

Solar Physics, v. 168, Issue 2, p. 331-343.

Physics

8

Scientific paper

We discuss Yohkoh SXT observations of stationary giant post-flare arches which occurred on 3-6 May, 1992 and study in detail the last arch, associated with the flare at 19:02 UT on 5 May, which extended above the west limb. The arch was similar to the first giant arch discovered on board the SMM, on 21-22 May, 1980. We demonstrate that the long lifetimes of these structures necessarily imply additional energy input from the underlying active region: otherwise, conduction would cool these arches in less than one hour and even with the unlikely assumption of conduction inhibited, pure radiative cooling would not produce the temperature decrease observed. All arch tops, although varying in brightness, stayed for several days at a fairly constant altitude of 100 000 km, and the arch studied, on 5-6 May, was just a new brightening of the pre-existing decaying structure. The brightening was apparently due to inflow of hot plasma from the flare region. Yohkoh data confirm that these stationary arches are rare phenomena when compared with the rising arches studied in Paper I and with Uchida et al. `s expanding active regions

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