More Rotating Sunspot Observations by TRACE With Twisting EUV Coronal Fans

Details More Rotating Sunspot Observations by TRACE With Twisting EUV Coronal Fans More Rotating Sunspot Observations by TRACE With Twisting EUV Coronal Fans

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh41b11n&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH41B-11

Other

7509 Corona, 7524 Magnetic Fields, 7529 Photosphere

Scientific paper

In an on-going search several sunspots, rotating about their umbral centers, have been identified in TRACE photospheric white light (WL) images. In many cases the rotation can also be seen in the corresponding UV (1600 Å) and/or EUV (171, 195 Å) images. Preliminary analysis of one such rotating sunspot and the coronal response to the rotation, observed in AR9114 on August 8-10, 2000, was presented at the fall AGU meeting (Nightingale et al., Abstract SH11A-10, EOS, AGU 2000 Fall Meeting, Vol. 81, p. F977, Nov. 2000). Further detailed analysis and modeling of this event, where loops appear to cross over one another, is in progress. Meanwhile, we are finding other examples within the TRACE data set. Twisting EUV coronal fans have been observed above rotating sunspots on August 16, 1999 for AR8667, where a sigmoid was visible in Yohkoh SXT data, and on May 20, 2000. Several rotating sunspots were also seen in the active region of the July 14, 2000 Bastille Day event. More recent rotations observed only in WL and UV occurred on December 11 and 22, 2000. Movies of some of these rotations will be shown, as well as magnetic field data from MDI on SOHO where available. Analysis of the rotational rates of the sunspots will be given. These observations display the coupling of the magnetic field from the photosphere into the corona. This work was supported by NASA under contract NAS5-38099.

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