Abstract
The complex active region NOAA 9672 is studied when it was near the central meridian, from October 21–26, 2001. At that time, there was an emergence of new magnetic flux, with the ongoing formation of a filament. The dynamics of the magnetic field are studied in order to search for their possible manifestations in the filament structure, using SOHO MDI magnetograms, SOHO EIT and TRACE filtergrams in the 171 Å line, and Hα filtergrams available via the Internet. Our earlier conclusion that filaments form at the boundaries of supergranules near polarity-inversion lines is confirmed. The conclusion of Chae that sinistral filaments have positive magnetic helicity is also confirmed. New information about magnetic-field decay processes is obtained. The direction of motion of the magnetic poles and their relative positions suggest that the axial field of a filament forms as a result of either reconnection of cancelling magnetic poles, or emergence of horizontal magnetic-flux tubes.
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Original Russian Text © V.M. Grigor’ev, L.V. Ermakova, A.I. Khlystova, 2006, published in Astronomicheskiĭ Zhurnal, 2006, Vol. 83, No. 5, pp. 464–474.
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Grigor’ev, V.M., Ermakova, L.V. & Khlystova, A.I. Evolution of a filament due to magnetic-field variations in a complex active region. Astron. Rep. 50, 411–421 (2006). https://doi.org/10.1134/S1063772906050106
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DOI: https://doi.org/10.1134/S1063772906050106