Electric Currents and Coronal Structures in Two Flare- Productive Active Regions, AR 6850 and AR 6952

Details Electric Currents and Coronal Structures in Two Flare- Productive Active Regions, AR 6850 and AR 6952 Electric Currents and Coronal Structures in Two Flare- Productive Active Regions, AR 6850 and AR 6952

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.3004m&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #30.04; Bulletin of the American Astronomical Society, Vol. 24, p.775

Astronomy and Astrophysics

Astronomy

Scientific paper

In this study, we examine the spatial and temporal relationship between coronal structures observed with the Soft X-Ray Telescope (SXT) on board the YOHKOH spacecraft and vertical electric currents derived from vector magnetograms obtained at the Mees Solar Observatory, Haleakala, Hawaii. We have focused on two active regions, AR 6850 (October 1991) and AR 6952 (December 1991). In both active regions, we observed significant current structures which persisted over time scales of days. The SXR emitting coronal structures, however, changed on much shorter time scales, indicating that there is no compelling, direct spatial and temporal relationship between the non-flaring SXR structures and the long-lived electric current systems. We have seen at least one case (in AR 6952) where a SXR brightening was associated spatially with a change in the vertical electric current. In this case, the the vertical current dissipated between December 8, 00:35 UT and the next observation at 00:48 UT on December 9, leaving a bright SXR structure which was observed at 24:27 UT on December 8. Hence, although more data must be analyzed to make a compelling case, it is possible that the SXR emission is related more closely to changes in the electric current systems rather than simply to the presence of these currents.

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