Coronal Structures (September 7, 2007)
Hi-res TIF image (1.7M)
When the Sun is in its quiet period as it is now, it often presents some very distinctive coronal structures that can be observed with SOHO's coronagraphs. In this still and video clip (September 2-5, 2007) one can see several, well-defined, lighter lines extending out into space. These are shaped by relatively long-lived magnetic features near the Sun's surface that extend out into space. Most solar scientists would call these "streamers." In the video clip you can watch as the fairly disorganized lines resolve themselves into an organized structure over the five days. These lines may remain in place for many more days as well. With the brilliant Sun blocked out by the red occulting disk, we can tease out these features in the corona. The white circle represents the size of the Sun itself. Near solar minimum these features usually extend out from near the equatorial region of the Sun.
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.
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