The Statistical Relationship between the Photospheric Magnetic Parameters and the Flare Productivity of Active Regions

Details The Statistical Relationship between the Photospheric Magnetic Parameters and the Flare Productivity of Active Regions The Statistical Relationship between the Photospheric Magnetic Parameters and the Flare Productivity of Active Regions

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.3403j&link_type=abstract

American Astronomical Society, SPD meeting #37, #34.03; Bulletin of the American Astronomical Society, Vol. 38, p.259

Astronomy and Astrophysics

Astronomy

Scientific paper

Using line-of-sight Michelson Doppler Imager (MDI) magnetograms of 89 active regions and Solar Geophysical Data (SGD) flare reports, we explored the magnitude scaling correlations between two parameters of photospheric magnetic fields and the flare productivity of solar active regions. These parameters are: (1) the length of strong-gradient magnetic neutral lines, and (2) the total magnetic energy 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. 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 entire disk passage down to +1 day from the time of analyzed magnetogram. Our results explicitly indicate positive correlations between the parameters and the overall flare productivity of active regions, and imminent flare production as well. The correlations confirm the dependence of flare productivity on the degree of nonpotentiality of active regions, as well as proving the good potential of photospheric magnetic parameters in flare forecasting.JJ, HS, CT and HW are supported by NSF under grant ATM-0313591, ATM-0342560, ATM-0536921, ATM-0548952 and NASA under grant NAG5-13661. VA is supported by NASA under grant NNG0-5GN34G.

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