Rapid Penumbral Decay in Active Region NOAA 9026 Associated with Two X-Class Flares

Details Rapid Penumbral Decay in Active Region NOAA 9026 Associated with Two X-Class Flares Rapid Penumbral Decay in Active Region NOAA 9026 Associated with Two X-Class Flares

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.1619d&link_type=abstract

American Astronomical Society, SPD meeting #34, #16.19; Bulletin of the American Astronomical Society, Vol. 35, p.836

Other

1

Scientific paper

In recent studies, we found that the longitudinal magnetic field changes drastically during energetic M- and X-class flares. In this poster, we show an example of rapid penumbral decay associated with two X1.1/X2.3 flares in active region NOAA 9026 on 2000 June 6. From about 08:00 UT to 13:30 UT, several C-class and one M-class flares occurred in the active region. An X1.1 flare started at 13:00 UT and reached its maximum at 13:39 UT, which was followed by another M7.1 flare at 13:56 UT. This flare reached its maximum at around 14:01 UT and decayed quickly and ended at 14:11 UT. The largest event was an X2.3 flare starting at 14:58 UT. It reached its peak at around 15:25 UT and since then decayed slowly. The penumbra in two distinct regions partially disappeared as a result of the X-class flares. This event also produced a type II radio burst (1189 km/s), a type IV radio burst, an 11-degree long filament eruption, and full-halo coronal mass ejection (CME). Even though the penumbral decay happened in a δ -sunspot, our observations will provide guidance for subsequent studies employing two-dimensional spectro-polarimetry and image reconstruction, and for models to understand active region evolution and solar activity.
This work was supported by NSF under grant ATM 00-86999, ATM 00-76602, and ATM 02-36945, and by NASA under grant NAG 5-9682.

Affiliated with

Also associated with

No associations

Rating

Rapid Penumbral Decay in Active Region NOAA 9026 Associated with Two X-Class Flares 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 Rapid Penumbral Decay in Active Region NOAA 9026 Associated with Two X-Class Flares, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rapid Penumbral Decay in Active Region NOAA 9026 Associated with Two X-Class Flares will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-988237