Computer Science
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..149n&link_type=abstract
Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc
Computer Science
8
Scientific paper
In an on-going study, several sunspots, in apparent rotation, have been identified in TRACE photospheric white light (WL) images with accompanying twisting of coronal fans in the corresponding EUV (171, 195 AA) images. These observations can also be temporally and spatially associated with S or inverse-S shaped regions (sigmoid structures) appearing in Yohkoh SXT images and with concurrent coronal mass ejections (CMEs) and/or flares. We have determined the rotational speed of the apparently rotating sunspot in AR 9114 over 8-10 August 2000, established the inverse S shape observed in the SXT data, and viewed a rapid, bright flash of possible reconnection in a TRACE EUV movie. A CME was observed during the 15-18 August 1999 event, which also included an inverse S shaped region in the SXT data, and a rotating sunspot and twisting coronal fans in the TRACE data. The large Bastille Day CME event of 14 July 2000 was accompanied by one or more apparently rotating sunspots as observed in TRACE WL and by an inverse S shaped region as seen in a difference SXT image. Movies and plots of some of these data will be shown along with flow maps and a list of the pertinent parameters for several rotating sunspots. We will report on our attempt to determine the vertical electric current flowing through the 8 August 2000 sunspot utilizing the Mees vector magnetograph data in order to better understand the apparent rotation "driver". These observations display the coupling of the solar magnetic field from the photosphere into the corona.
Brown Scott D.
Metcalf Thomas R.
Nightingale Richard W.
Schrijver Carolus J.
Shine Richard A.
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