Vertical and horizontal magnetic field structure in δ-spot

Details Vertical and horizontal magnetic field structure in δ-spot Vertical and horizontal magnetic field structure in δ-spot

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001izkry..97...43b&link_type=abstract

Izvestiya Krymskoj Astrofizicheskoj Observatorii, Tom 97, p. 43 - 55 (2001)

Astronomy and Astrophysics

Astronomy

2

Sunspots, Magnetic Fields

Scientific paper

The vertical and horizontal magnetic field structure and vertical electric current densities in the AR NOAA 6659 have been investigated from the analysis of the polarized spectral photographic observations 7 and 11 June 1991 in the wavelength interval 610.1-615.2 nm. The following results were obtained: 1) The regions with different vertical gradients of the magnetic field coexist simultaneously at the adjacent parts of the δ-spot. 2) The penumbra of the δ-spot is the region of strong and complex magnetic fields: at some sites of the penumbra the strength of the magnetic field is higher by 400-500 Gs than at adjacent umbra. 3) At the region of the largest flare activity the magnetic field consists of the structural elements with size from 3 to 15 arcsec in which the transverse magnetic field directions are distinguished by 90°. 4) Sharp change of the transverse magnetic field direction with height were detected at some regions of δ-spot. 5) The vertical electric current densities in the delta spot reach the values up to 105A/km2 at the period without the significant flare activity. 6) The rise of the magnetic flux tubes with strong magnetic fields (3200-4000 Gs) with the line of sight velocities of about 0.6-1.5 km/s have been detected. It was concluded that the main peculiarity which determines high flare activity of delta-spot configuration is the emergence of a new twisted rope with high magnetic field in the region of strong nonpotential magnetic field.

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