Magnetic Flux Cancellation Observed in the Sunspot Moat

Details Magnetic Flux Cancellation Observed in the Sunspot Moat Magnetic Flux Cancellation Observed in the Sunspot Moat

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001soph..202..309y&link_type=abstract

Solar Physics, v. 202, Issue 2, p. 309-318 (2001).

Physics

17

Scientific paper

In this paper we study the evolution of magnetic fields of a 1F/2.4C solar flare and following magnetic flux cancellation. The data are Big Bear Solar Observatory and SOHO/MDI observations of active region NOAA 8375. The active region produced a multitude of subflares, many of them being clustered along the moat boundary in the area with mixed polarity magnetic fields. The study indicates a possible connection between the flare and the flux cancellation. The cancellation rate, defined from the data, was found to be 3×10^19 Mx h^-1. We observed strong upward directed plasma flows at the cancellation site. Suggesting that the cancellation is a result of reconnection process, we also found a reconnection rate of 0.5 km s^-1, which is a significant fraction of Alfvén speed. The reconnection rate indicates a regime of fast photospheric reconnection happening during the cancellation.

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