Foreshadowing the Action (March 23, 2007)
Hi-res TIF image(1.5M)
Foreshadowing is a literary device to hint at what is coming later in a story. We are going to engage in a little foreshadowing with the Sun. As of the beginning of March 19, 2007, there were no sunspots on the Sun and no indication of when any activity would be observable. And even on March 20, no sunspots could be observed in the ultraviolet wavelengths of light or even filtered white light. But like storm clouds on a horizon, disturbances above an active region had already begun to come into view on the edge of the Sun in the ultraviolet images from SOHO. Initially, we saw some brightening at the Sun's edge and then, a half a day later or so, loops of particles spiraling above the edge of the Sun could be spotted. At this point, we could foretell what was coming next. By the 21st, an active region itself could be seen as it rotated into view. The extreme ultraviolet images told the tale.
In the next day or so, the active region should be able to be seen as sunspots in the white light images and magnetic as well with the Sun's rotation bringing them around from the very edge. Active regions are the source of many solar storms.
SOHO began its Weekly Pick some time after sending a weekly image or video clip to the American Museum of Natural History (Rose Center) in New York City. There, the SOHO Weekly Pick is displayed with some annotations on a large plasma display.
If your institution would also like to receive the same Weekly Pick from us for display (usually in Photoshop or QuickTime format), please send your inquiry to firstname.lastname@example.org.