Bang-Bang CMEs (June 17, 2004)
Hi-res TIF image ( 16M).
Two nearly simultaneous coronal mass ejections (CMEs) were captured by SOHO's LASCO C2 instrument on 15 June 2004, an event that was last seen over two years ago. The first CME emerged from behind the occulting disk at 3:06 UT in the 10 o'clock position. The second and brighter CME appeared five hours later in the four o'clock position. Both had well-defined, bulbous loop structures. CMEs eject a billion tons of particles traveling millions of miles an hour. The dark disk blocks the Sun so that the LASCO instrument can observe the structures of the corona in visible light. Neither of these events seemed to have triggered any auroral activity on Earth since they were directed in a path mostly oblique to Earth. In the still image, an EIT 304å image of the Sun at about the time of the CMEs was superimposed on the occulting disk.
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