Chromospheric Evolution and the Flare Activity of Super-Active Region NOAA 6555

Details Chromospheric Evolution and the Flare Activity of Super-Active Region NOAA 6555 Chromospheric Evolution and the Flare Activity of Super-Active Region NOAA 6555

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997japa...18...39d&link_type=abstract

Journal of Astrophysics and Astronomy, Vol. 18, p.39

Astronomy and Astrophysics

Astrophysics

4

Super-Active Region, Chromosphere, Flare Activity, Magnetic Field

Scientific paper

Super-active region NOAA 6555 was highly flare productive during the period March 21st-27th, 1991 of its disk passage. We have studied its chromospheric activity using high spatial resolution H(alpha) filtergrams taken at Udaipur along with MSFC vector magnetograms. A possible relationship of flare productivity and the variation in shear has been explored. Flares were generally seen in those subareas of the active region which possessed closed magnetic field configuration, whereas only minor flares and/or surges occurred in subareas showing open magnetic field configuration. Physical mechanisms responsible for the observed surges are also discussed.

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