Hinode/XRT Observations of a Coronal Sigmoid

Details Hinode/XRT Observations of a Coronal Sigmoid Hinode/XRT Observations of a Coronal Sigmoid

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7208m&link_type=abstract

American Astronomical Society Meeting 210, #72.08; Bulletin of the American Astronomical Society, Vol. 39, p.180

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Scientific paper

We present the first observations of an X-ray sigmoid made with the Hinode X-Ray Telescope, co-aligned with those of TRACE and SoHO/MDI. XRT's extraordinary angular resolution (1 arcsec/pixel) and the sigmoid's location near disk center combined to provide an unprecedented view of the formation and eruption of this phenomenon. XRT observed the sigmoid over several days, with cadences as high as 1 image per 10--30 seconds. The first motions associated with eruption of the sigmoid started at 0600UT on 12-Feb-2007; the first brightening of the ensuing X-ray arcade was seen at 0740UT.
The images during the pre-eruptive phase, which ends with the onset of large-scale motions, show:

• The overall S shape of the sigmoid is not defined by any single X-ray loop. Rather, many individual loops collectively comprise an S-shaped pattern.
• The S shape is comprised of two separate J shapes, whose straight sections lie anti-parallel to one another in the middle of the S, on opposite sides of the magnetic polarity inversion line.
• During the several-day span of the XRT observation, the S shape gradually becomes better defined.

The images during the eruptive phase show:

• Approximately 100 minutes before any soft X-ray flaring begins, a diffuse linear structure, almost as long as the sigmoid, lifts off from the middle of the S. It shows slight clockwise rotation.
• The X-ray flare begins with the appearance of a sheared arcade of short loops, in the area centered between the two J-shaped patterns of the sigmoid.
• Within 16 hours of the start of the flare, no S shape remains.

Taken together, these features provide strong support for the Bald-Patch Separatrix Surface model of sigmoids put forth by Titov & Demoulin (1999).

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