TRACE Observations of Many Active Regions with X-flares and Rotating Sunspots in the Current Solar Cycle

Details TRACE Observations of Many Active Regions with X-flares and Rotating Sunspots in the Current Solar Cycle TRACE Observations of Many Active Regions with X-flares and Rotating Sunspots in the Current Solar Cycle

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh13a1137n&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH13A-1137

Physics

7509 Corona, 7513 Coronal Mass Ejections, 7519 Flares, 7524 Magnetic Fields, 7529 Photosphere

Scientific paper

The TRACE instrument in its 7 UV and EUV wavelength channels has observed approximately 55 X-flares throughout its mission so far in solar cycle 23 from launch in April 1998 through August 2004. About 40 of those X-flares (73%) can be associated with 17 solar active regions that contain rotating sunspots, which have been observed by TRACE in its white light channel. These sunspots, rotating about the center of their umbras, appear to be manifestations of the twist and/or writhe, i.e., the helicity, instilled in the rising active region omega loops as they travel through the convection region below the photosphere. Of the 40 X-flaring active regions observed, 26 (65%) can be further associated with large, fast Coronal Mass Ejections (CMEs) leaving the sun, as recorded by the LASCO instrument on SoHO. Furthermore, 24 of these 26 events appear to be geo-effective because the energetic proton fluxes, observed by instruments on the GOES geosynchronous spacecraft, increased by several orders of magnitude shortly after the solar events occurred. The data and the importance of such a high percentage of rotating sunspots being associated with X-flaring active regions and CMEs will be discussed. This work was supported by NASA under the TRACE contract NAS5-38099.

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