IMAGES OF SIGMOIDS -- CLICK TO ENLARGE

A sigmoid before an eruption. 8 June 1998 15:19 UT. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Acknowledgement tif

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A sigmoid with a cusp, indicating an eruption has taken place. 9 June 1998 16:17 UT. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Acknowledgement tif

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A sigmoid before (left, 8 June 1998 15:19 UT) and after (right, with cusp, 9 June 1998 16:17 UT) an eruption has taken place. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Acknowledgement .


Top: The northern hemisphere of the Sun, with two sigmoids. 15 May 1998 10:47 UT. Bottom: A sigmoid before (left, 8 June 1998 15:19 UT) and after (right, with cusp, 9 June 1998 16:17 UT) an eruption has taken place. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Acknowledgement .


The Sun and sunspots as seen in visible light. Acknowledgement .


Distribution of solar active regions in 1993 and 1997 (combined) in three ranges of sunspot area. Acknowledgement .


Collage showing the sequence from pre-eruption sigmoid to post-eruption cusp/arcade. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Acknowledgement . tif


Collage showing the sequence from pre-eruption sigmoid to post-eruption cusp/arcade. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Acknowledgement . tif


The Sun with a sigmoid present (lower left) which produced a SOHO halo CME on the following day. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Acknowledgement .


The sigmoid just before the halo CME took place. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Acknowledgement .


The cusp and arcade just after the halo CME took place. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Acknowledgement .


An erupting prominence as photographed in the 304 Angstrom emission of helium on March 31, 1998. The image shows the probable origins of twisted structures seen in the CME shown in the SOHO LASCO video and the motions shown in the EIT/SOHO movie of a filament eruption associated with the 1997 October 23 halo CME (animated gif).


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