Two-dimensional singular points in an observed transverse field in solar active region NOAA 7321

Details Two-dimensional singular points in an observed transverse field in solar active region NOAA 7321 Two-dimensional singular points in an observed transverse field in solar active region NOAA 7321

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...342..854w&link_type=abstract

Astronomy and Astrophysics, v.342, p.854-862 (1999)

Astronomy and Astrophysics

Astrophysics

16

Sun: Activity, Sun: Flares, Sun: Magnetic Fields, Sun: X-Rays, Gamma Rays

Scientific paper

In the present paper, we give a realistic diagnosis to 2D singular points in the observed transverse field in AR 7321 on October 27, 1991. These singular points are compared with those in the extrapolated field, inferred from the observed longitudinal field boundary on a linear force-free field model. The extrapolated 3D magnetic connectivity patterns are taken to determine the involved separatrices. In order to understand the heating mechanism of flaring loops in the corona, we compare singular features in the photosphere with SXR observations from Yohkoh. The major results include: (a) The filtering technique is proven efficient in excluding the false candidate points due to the measurement noise. (b) The 2D topology of the observed field indicates more interesting characters than those the linear force-free field can interpret, which are involved in the evolution of magnetic structures. (c) Two kinds of 2D cells, differed by 2D magnetic connectivity patterns, are associated with magnetic loops of different heights and shapes. (d) Some events releasing energy show that coronal loops are interacting at regions, which are involved in the separatrices.

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