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  how does a solar eclipse occur?
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what can we learn from a solar eclipse?


What can we learn from a solar eclipse observation? We know that the corona is very, very hot (over one million degrees), but we're not sure why. We're interested in finding out what makes it so hot. We think waves might carry energy into the corona, so we've been looking for waves in the corona, which are visible during a solar eclipse.


We use a special digital movie camera to study the corona during a solar eclipse. The problem is that solar eclipses don't last very long, so the camera has to work really, really fast. Our camera takes 50 images every second. What we are looking for are waves moving through the corona, just like waves on the surface of a pond.


Photo of an eclipse with SECISOur camera, and the computer system which drives it, is called SECIS (Solar Eclipse Corona Imaging System).



You can observe detailed movement more clearly if you take lots of pictures in rapid succession.


SECIS team photoOne great thing of course is that we get to go to eclipses in lots of interesting places. We went to Guadeloupe in 1998, to Bulgaria in 1999 and to Zambia in 2001. In Zambia, we set up our equipment on the roof of the University in Lusaka. There were lots of African students and families up there with us. When totality happened, they got so excited that they started to sing and dance, which gave us a few more waves and vibrations than we had hoped for. Doh!


Credit: Habbal et al.


Here is an eclipse image take with different filters in the visible. Red corresponds to plasma around 1 Million degrees and green is around 2 Million degrees.


For more information see the Solar Fingerprints section here.




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