Magnetic Flux Cancellation Observed in the Sunspot Moat |
| |
Authors: | Yurchyshyn Vasyl B. Wang Haimin |
| |
Affiliation: | (1) Big Bear Solar Observatory, Big Bear City, CA, 92314, U.S.A.;(2) Crimean Astrophysical Observatory, 98409 Nauchny, Crimea, Ukraine |
| |
Abstract: | 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 3×1019 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|