2019/01/17 by M. B. Korsós, Korsos, Marianna B., Shuhong Yang +3
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #FOS: Physical sciences #Geomagnetism and Paleomagnetism Studies #Ionosphere and magnetosphere dynamics #Solar and Space Plasma Dynamics #Solar and Stellar Astrophysics (astro-ph.SR)
paper · pdf · doi:10.48550/arxiv.1901.05984
openalex publication_date 2019/01/17 · openalex created_date 2022/07/30 · openalex updated_date 2026/07/28
There is a wide range of eruptions in the solar atmosphere which contribute\nto space weather, including the major explosions of radiation known as flares.\nTo examine pre-event behavior in delta-spot regions, we use here a method based\non the weighted horizontal gradient of magnetic field (WGM), defined between\nopposite polarity umbrae at the polarity inversion line of active regions (ARs)\nas measured using from the Debrecen Heliophysical Observatory catalogues. In\nthis work, we extend the previous analysis of high-energy flares to include\nboth medium (M) and low-energy (C and B) flares. First, we found a logarithmic\nrelationship between the log value of highest flare class intensity (from B- to\nX-class) in a \δ-spot AR and the maximum value of WGM of the 127 ARs\ninvestigated. We confirm a trend in the convergence-divergence phase of the\nbarycenters of opposite polarities in the vicinity of the polarity inversion\nline. The extended sample (i) affirms the linear connection between the\ndurations of the convergence-divergence phases of barycenters of opposite\npolarities in delta-spot regions up to flare occurrence and (ii) provides a\ngeometric constraint for the location of flare emission around the polarity\ninversion line. The method provides a tool to possibly estimate the likelihood\nof a subsequent flare of the same or larger energy.\n