Non-Potentiality of the Magnetic Field Beneath the Eruptive Filament in the Bastille Event

Details Non-Potentiality of the Magnetic Field Beneath the Eruptive Filament in the Bastille Event Non-Potentiality of the Magnetic Field Beneath the Eruptive Filament in the Bastille Event

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002soph..209..375t&link_type=abstract

Solar Physics, v. 209, Issue 2, p. 375-389 (2002).

Physics

11

Scientific paper

Based on photospheric vector magnetograms obtained at Huairou Solar Observing Station (HSOS), non-potential characteristics of the magnetic field beneath the filament in active region NOAA 9077 are investigated. We focus on the structure and evolution of the magnetic field from 00:08 UT to 10:25 UT of 14 July before the Bastille event. Particular attention is paid to transverse field strength, shear degree and horizontal gradient of the line-of-sight magnetic field around the filament and filament channel. The following characteristics are found. (1) The magnetic non-potentiality has an obviously non-uniform distribution. The shear degree of the transverse field (Hagyard et al., 1984) is very large, up to 75° in some sites beneath the filament, such as the initial brightening site in TRACE 1600 Å images and the breaking site of the filament. The transverse field and the horizontal gradient of the line-of-sight field are very large in some parts corresponding to the hottest and continuously brightening portions. (2) The mean strength and mean shear angle of the transverse field and mean horizontal gradient of the line-of-sight field have obviously dropped in most parts beneath the filament for two hours before the filament eruption and onset of the X5.7/3B flare. After comparing simultaneous UV and EUV images, Hβ filtergrams and Dopplergrams at solar atmosphere, we suggest that magnetic cancellation is likely to quickly transport the magnetic energy and complexity into the higher atmosphere in these two hours. This leads to magnetic instability in the filament and eventually causes the eruption of filament and onset of the flare.

Affiliated with

Also associated with

No associations

Rating

Non-Potentiality of the Magnetic Field Beneath the Eruptive Filament in the Bastille Event 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 Non-Potentiality of the Magnetic Field Beneath the Eruptive Filament in the Bastille Event, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-Potentiality of the Magnetic Field Beneath the Eruptive Filament in the Bastille Event will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1861983