An analysis of the flares in the active region NOAA 6891

Details An analysis of the flares in the active region NOAA 6891 An analysis of the flares in the active region NOAA 6891

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997cha%26a..21q.128l&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 21, Issue 1, p. 128-128.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We analyzed the evolution of the sunspots and the positions and possible cause of the flares in a large δ-type active region in 1991 October. 89% of the flares occurred by the side of two neutral lines where there was large transverse magnetic field and shear. Hα observation in one neutral line showed the sunspots were pressed and sheared into Ω type; in the other, large changes in bundles of fibrils were observed, and magnetic ropes could be clearly seen at times. Observations showed that there is no clear relation between the occurrence of large flares and the size of the transverse or the shearing, whereas magnetic cancellation caused by newly emergent flux could be one of the causes. Two opposite polarity spots were observed for the first time located within one and same umbra, such a configuration is probably related to the two white-light flares observed on 24 and 27.

Affiliated with

Also associated with

No associations

Rating

An analysis of the flares in the active region NOAA 6891 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 An analysis of the flares in the active region NOAA 6891, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An analysis of the flares in the active region NOAA 6891 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1779268