Affordable Access

Publisher Website

Magnetic shear produced by colliding sunspots

Authors
Journal
Advances in Space Research
0273-1177
Publisher
Elsevier
Publication Date
Volume
6
Issue
6
Identifiers
DOI: 10.1016/0273-1177(86)90106-7

Abstract

Abstract The leading and trailing sunspots of two adjacent active regions are observed to collide as the evolving regions expand along the same direction. During approximately four days of this collinear motion, fibrils linking the colliding sunspots form a pattern suggestive of a potential magnetic field. No flares can be associated with the collision at this stage. Within a single day, and without an apparent change in the direction of the spots, the pattern of fibrils changes to a non-potential configuration. This onset of shear occurs rapidly in the absence of grazing motions. Thereafter, one spot splits, grazing motions develop, and shear is greatly enhanced along the line of polarity inversion. Sustained subflare activity begins after the onset of shear; stronger flares erupt as shear is enhanced. These circumstances are consistent with concepts based on shear as an essential ingredient of flares and which require critical levels of shear to be exceeded in order to trigger flares.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

Magnetic reconnection between colliding magnetized...

on Physical Review Letters Sep 05, 2014

Magnetic Structure of Sunspots

on Giornale della Libreria Sep 09, 2011

The magnetic fields of sunspots

on Vistas in Astronomy Jan 01, 1955
More articles like this..