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