Flaring Rates and the Evolution of Sunspot Group McIntosh Classifications

McCloskey, Aoife, Gallagher, Peter and Bloomfield, Shaun (2016) Flaring Rates and the Evolution of Sunspot Group McIntosh Classifications. Solar Physics, 291 (6). pp. 1711-1738. ISSN 0038-0938

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Official URL: http://dx.doi.org/10.1007/s11207-016-0933-y

Abstract

Sunspot groups are the main source of solar flares, with the energy to power them being supplied by magnetic-field evolution (e.g. flux emergence or twisting/shearing). To date, few studies have investigated the statistical relation between sunspot-group evolution and flaring, with none considering evolution in the McIntosh classification scheme. Here we present a statistical analysis of sunspot groups from Solar Cycle 22, focusing on 24-hour changes in the three McIntosh classification components. Evolution-dependent > C1.0, >M1.0, and > X1.0 flaring rates are calculated, leading to the following results: (i) flaring rates become increasingly higher for greater degrees of upward evolution through the McIntosh classes, with the opposite found for downward evolution; (ii) the highest flaring rates are found for upward evolution from larger, more complex, classes (e.g. Zurich D- and E-classes evolving upward to F-class produce > C1.0 rates of 2.66 ± 0.28 and 2.31 ± 0.09 flares per 24 hours, respectively); (iii) increasingly complex classes give higher rates for all flare magnitudes, even when sunspot groups do not evolve over 24 hours. These results support the hypothesis that injection of magnetic energy by flux emergence (i.e. increasing in Zurich or compactness classes) leads to a higher frequency and magnitude of flaring.

Item Type: Article
Uncontrolled Keywords: Active Regions, Structure; Flares, Forecasting; Flares, Relation to Magnetic Field; Sunspots, Magnetic Fields; Sunspots, Statistics
Subjects: F500 Astronomy
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 21 Jul 2016 10:48
Last Modified: 29 Jun 2017 01:06
URI: http://nrl.northumbria.ac.uk/id/eprint/27335

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