Backside eruption
posted: July 2, 2014

Late on 26 June, an eruption took place in an active region just behind the Sun's east limb. The event led to some spectacular images of the associated coronal mass ejection (CME) and post-flare coronal loops.

The eruption started around 21:00UT, and the expanding CME can be seen in extreme ultraviolet (EUV) in SDO, STEREO-B and PROBA2 imagery, as indicated with the dashed orange lines in the images underneath.



Despite being well behind the Sunís east limb, the region managed to produce a long duration C1.6 flare peaking at 01:14UT on 27 June.


The CME became first visible in SOHO/LASCO imagery around 22:00UT, and had a plane-of-the-sky speed of at least 400 km/s. Obviously, it was directed away from Earth and did not affect the geomagnetic field.


In the course of 27 June, the post-flare coronal loops put up a fascinating play as they were expanding and restructuring above the east limb. Around 15:00UT, these loops were standing at least 150.000 km above the solar surface.


This movie shows the features related to this backside eruption. It first shows the eruption as seen by STEREO-B in EUV and with the coronagraph. Then the CME and coronal loops are shown in combination movies of SOHO, PROBA2 and SDO. The clip ends with a 24 hour view on the restructuring coronal loops.

Credits - Data and imagery for the movie clips were taken from SDO, STEREO, SOHO/LASCO, PROBA2, and Helioviewer.