Arcade Formation and the Non-Eruption of Dissappearing Hα Filaments as Seen with the YOHKOH Soft X-Ray Telescope

Details Arcade Formation and the Non-Eruption of Dissappearing Hα Filaments as Seen with the YOHKOH Soft X-Ray Telescope Arcade Formation and the Non-Eruption of Dissappearing Hα Filaments as Seen with the YOHKOH Soft X-Ray Telescope

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.2303m&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #23.03; Bulletin of the American Astronomical Society, Vol. 24, p.760

Astronomy and Astrophysics

Astronomy

Scientific paper

Several examples have been found of a type of initial structure made up of a group of nested arched loops, at a large angle to the vertical, with long twisted threads emerging from between their foot points, giving the impression that the filaments dive into the mouth of a tunnel defined by the arches. These structures are often correllated with Hα dark filaments that are aligned along the long threads and extend under the arches. On at least two occassions, on the Sep. 28th 1991, and Feb. 21st 1992, there were brightenings in such structures associated with untwisting of the twisted threads while the arched loops were replaced by an arcade, under which a bright axial thread is seen along the same line as the long twisted threads. During this time the Hα dark filaments disappear. We examined several of these events using image analysis techniques to bring out the fine structure, and show in detail the evolution of the new soft x-ray arcade perpendicular to the disappearing dark filament and of the bright axial thread that lies along the arcade. At a glance this thread seems to correspond to the locus of the reconnecting points in the inverse Y-shaped reconnection, in helmet-like configuration models (Sturrock, Hirayama, Kopp-Pneuman). We find, however, that 1) this bright thread seems to connect to the long untwisting threads, and that 2) it does not rise up through the overlying arcade. There is likewise no sign of reconnection in the overlying corona, as expected in those models. Therefore, it seems that at least the major part of the heated mass as well as the longitudinal field of the dark filament simply remained inside the arcade which stays intact, requiring a new way of explaining the phenomenon. We present a more detailed discription of this type of event and comment on the implications to existing theoretical models.

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