Proba-2 view of post-eruptive loops on Sun

ESA’s Sun-watching Proba-2 minisatellite shows the aftermath of 18 February’s ‘coronal mass ejection’.

Acquired at 0445 GMT, a little more than three hours after the initial eruption, the image demonstrates the Sun’s magnetic field reconnecting in the form of loops. Look down and left of the centre of the solar disc to clearly see this distinctive belt of loops.

Coronal mass ejections are triggered by a rearrangement of initially opposing magnetic fields in the Sun’s corona. Stored magnetic energy is converted into heat and kinetic energy, potentially triggering a huge outward eruption. In the process the magnetic fields are reconfigured into a more relaxed state.

Fields that have recently reconnected are heated to perhaps 10 million degrees, then cooling to the one million degree temperatures that are visible to Proba-2’s SWAP imager. A second Proba-2 sensor, LYRA, measures the Sun’s energy intensity at the same time. Both instruments are operated for ESA by the Royal Observatory of Belgium.

All the latest solar images from ESA and NASA are fed to the Helioviewer website, where you can make your own images and animations – www.helioviewer.org/

Taken on: February 21, 2014

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Proba-2

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