The statistical relationship between the photospheric magnetic parameters and the flare productivity of active regions
Abstract
Using line-of-sight Michelson Doppler Imager MDI magnetograms of 89 active regions and Solar Geophysical Data SGD flare reports we explored for the first time the magnitude scaling correlation between three magnetic parameters and the flare productivity of solar active regions These parameters are 1 the average value of spatial gradients of the magnetic field on the magnetic neutral line overline nabla B z NL 2 the length of magnetic neutral line with strong magnetic gradient L GNL and 3 total magnetic energy int epsilon B z dA dissipated in a layer of 1m during 1 second over the active region s area The MDI magnetograms of active regions used for our analysis are close to the solar central meridian within pm 10° The flare productivity of active regions was quantified by the soft X-ray flare index for different time windows from the time interval of the disk passage down to 1 day from the magnetogram recording Our results explicitly indicate a positive correlation between the parameters and the overall flare productivity of active regions and imminent flare production as well The correlations of three parameters with flare productivity confirm respectively the dependence of flare productivity on 1 complexity of magnetic field 2 the degree of nonpotentiality of active regions and 3 intensity of turbulent motions of magnetic flux tubes in the photosphere The parameters might usefully complement each other in flare forecasting
- Publication:
-
36th COSPAR Scientific Assembly
- Pub Date:
- 2006
- Bibcode:
- 2006cosp...36..107J