Eight Days a Week (and 16 years since launch)
June 28, 2012
Since the Sun produced about a dozen coronal mass ejections (CMEs) in eight days, it did seem like it was working overtime (Nov. 22-28, 2011). The SOHO C2 coronagraph shows the storms (both large and small) blasting out in different directions. The Sun itself taken by the Solar Dynamics Observatory in extreme UV light was scaled appropriately and superimposed on the coronagraph for the same time period. It took over 1300 frames to make the video clip. The still shows some a composite of some of the larger CMEs. The times of the three stacked LASCO C2 images featured in the still are (top to bottom): 11/26/2011 at 07:48:06; 11/23/2011 at 10:48:06; and 11/28/2011 at 08:00:05. Incidentally, on a different note, with last week's feature, SOHO's Pick of the Week (with help from STEREO, and even SDO on occasion) marked its 500th edition. We have been producing about 50 POTWs per year since September, 2001. The POTW has proven to be a reliable workhorse for showcasing some of our best content for our viewers online and in hundreds of museums and science centers. We plan to continue it for the foreseeable future. And, to top it off, SOHO celebrated its 16th years of operations on Dec. 2, quite a record of achievement.
Topics: Stars, Solar telescopes, Astronomy, SOHO, STEREO, Solar Dynamics Observatory, Coronal mass ejection, Coronagraph, Corona, Sun, Space plasmas, Plasma physics, the Sun