A Quadruple Magnetic Source Model for Arcade Flares and X-Ray Arcade Formations outside Active Regions I. Dark Filament Suspension and the Magnetic Structure in the Pre-Event Regions

Details A Quadruple Magnetic Source Model for Arcade Flares and X-Ray Arcade Formations outside Active Regions I. Dark Filament Suspension and the Magnetic Structure in the Pre-Event Regions A Quadruple Magnetic Source Model for Arcade Flares and X-Ray Arcade Formations outside Active Regions I. Dark Filament Suspension and the Magnetic Structure in the Pre-Event Regions

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..553u&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.553-563.

Astronomy and Astrophysics

Astronomy

16

Sun: Flares, Sun: Magnetic Field, Sun: Prominences, Sun: X-Rays

Scientific paper

The high-sensitivity, wide dynamic-range observations by the Soft X-ray Telescope (SXT) aboard Yohkoh has enabled us to look into the faint pre-event structures of arcade flares, and of even fainter X-ray arcade formation events outside active regions. What we have found in the pre-event structure of the latter, however, was not a sagged simple (bipolar) arcade, as expected in the classical model, but a ``dual-arcades" type structure in which the inside legs of each ``arcade'' cross with the other's, landing at the closer part of the domain of the other. Similar features, together with some other features inexplicable in the classical arcade flare model, were also found in strong arcade flares in active regions seen axis-on at the limb. These features raised a severe problem with the classical ``reclosing of the once opened simple arcade'' model(s). In the present paper, we propose interpretations of what we discovered by Yohkoh-SXT by reviving a quadruple source model proposed by one of the authors (YU) years ago, pointing out a serious difficulty in the classical model(s). This model, based on the quadruple magnetic sources in the photosphere, has a ``neutral sheet'' already in the pre-event phase in the corona above the field polarity-reversal line in the photosphere, and turns out to explain quite nicely the structures of both faint pre-event corona before arcade formation events, and that of arcade flares discovered by Yohkoh-SXT. A dynamic model of arcade flares and arcade formation events based on this dark filament model will be discussed in the forthcoming Paper II of this series.

Affiliated with

Also associated with

No associations

Rating

A Quadruple Magnetic Source Model for Arcade Flares and X-Ray Arcade Formations outside Active Regions I. Dark Filament Suspension and the Magnetic Structure in the Pre-Event Regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Quadruple Magnetic Source Model for Arcade Flares and X-Ray Arcade Formations outside Active Regions I. Dark Filament Suspension and the Magnetic Structure in the Pre-Event Regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Quadruple Magnetic Source Model for Arcade Flares and X-Ray Arcade Formations outside Active Regions I. Dark Filament Suspension and the Magnetic Structure in the Pre-Event Regions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1016502