Extended statistical analysis of emerging solar active regions

Abstract

We use observations of line-of-sight magnetograms from Helioseismic and Magnetic Imager (HMI) on board of Solar Dynamics Observatory (SDO) to investigate polarity separation, magnetic flux, flux emergence rate, twist and tilt of solar emerging active regions. Functional dependence of polarity separation and maximum magnetic flux of an active region is in agreement with a simple model of flux emergence as the result of buoyancy forces. Our investigation did not reveal any strong dependence of emergence rate on twist properties of active regions.

arXiv commentAccepted by MNRAS

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• The Source Locations of Major Flares and CMEs in the Emerging Active Regions
• Magnetic Helicity and Free Magnetic Energy as Tools to Probe Eruptions in two Differently Evolving Solar Active Regions
• Magnetic fluxes of solar active regions of different magneto-morphological classes: I. Cyclic variations
• On the possibility to probe the flare productivity of an active region on the early stage of emergence
• Naked emergence of an anti-Hale active region I. Overall evolution and magnetic properties
• Statistical analysis of the total magnetic flux decay rate in solar active regions