The magnetic evolution of the activity complex AR 7260: A roadmap

Details The magnetic evolution of the activity complex AR 7260: A roadmap The magnetic evolution of the activity complex AR 7260: A roadmap

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..155..301l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 155, no. 2, p. 301-337

Physics

27

Faculae, Magnetic Flux, Mapping, Polarity, Sunspot Cycle, Astronomical Observatories, Imaging Spectrometers, Magnetic Dipoles, Solar Magnetic Field, Space-Time Functions

Scientific paper

The active region NOAA 7260 rotated onto the north solar hemisphere as a mature bipole: a dominant negative-polarity sunspot with trailing plage and scattered small spots in attendance. The dominant p spot itself had strong magnetic fields and covered almost 400 x 10-6 of a solar hemisphere. For a period of seven days beginning 14 August, 1992 this active region displayed rapid and drastic evolution: no fewer than 50 magnetic bipoles emerged in the area trailing the large sunspot, increasing the region's magnetic flux by more than 1022 Mx. This new group of sunspots formed a complex Beta gamma delta configuration with two delta spots and a high degree of magnetic shear. This region was very well observed by Yohkoh and various ground-based instruments. It presented opportunities to study new emerging flux, flares, and also the decay of a large sunspot. For the benefit of later studies we present a description of the global characteristics of this active region, a detailed 'roadmap' of its evolution during disk passage including the development of the two delta regions. We compare proper motion trends and flaring activity to observations of other delta-spots reported in the literature. We also comment on the observed outflow of magnetic elements from the decaying p spot.

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