Two-dimensional magnetic singular points and flares in solar active regions.

Details Two-dimensional magnetic singular points and flares in solar active regions. Two-dimensional magnetic singular points and flares in solar active regions.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..285w&link_type=abstract

Astronomy and Astrophysics, v.313, p.285-296

Astronomy and Astrophysics

Astrophysics

17

Sun: Activity, Sun: Flares, Sun: Magnetic Fields

Scientific paper

We have proposed a method for detecting the two dimensional magnetic singular points in a plane intersecting with magnetic fields above the photosphere. Taking the observed photospheric longitudinal magnetic fields from active regions, NOAA 7640 and 6891, as the boundary conditions, we extrapolated the potential magnetic fields above the photosphere, and then investigated the two dimensional singular points at a plane in the chromosphere by means of this method. It has been shown that these points are connected through lanes demarcating two dimensional magnetic cells in the plane. In the case of a field normal to the plane, these singular points and lanes correspond to magnetic separators and separatrices, respectively. Through precisely comparing the two dimensional magnetic singular points with the Hβ flare kernels during the evolution of these flares, we obtained following results: (a) The initial bright kernel of a Hβ flare is always related to a singular points with Poincare index of -1. (b) Kernels of Hβ flares tend to expand along lanes, especially at the beginning of the flares, so there is a close morphological relationship between lanes and flares. (c) The variations of singular points before and after a Hβ flare may not be related to the flare. These results possibly support the viewpoint that the magnetic reconnection initiates in a separator, and then it triggers a large scale magnetic energy release in separatrices.

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