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LOFAR Observations of Solar Type III Radio Bursts

Submitter: Frank Breitling
Description: On October 13, 2011 the Sun was observed by LOFAR in the framework of its key science project "Solar Physics and Space Weather with LOFAR".

The results are presented on this slide:

At the bottom the dynamic radio spectrum is shown in the frequency range of 122 - 162 MHz. It shows four so-called type III radio bursts. They appear as stripes of enhanced radio emission rapidly drifting from high to low frequencies. They are signatures of beams of energetic electrons generated by a flare on the Sun. If they travel along open magnetic field lines through the corona, they excite along their path radio radiation manifesting as type III bursts.

On top the corresponding radio images at 133 MHz are show before (left), during (middle), and after (right) the occurrence of the type III burst at 10:27:18 UT. The white circle indicates the limb of the visible disc of the Sun. The radio images are produced by means of the solar imaging pipeline developed at the Leibniz-Institut für Astrophysik Potsdam (AIP). The brightening of the radio source during the type III burst is seen at the South-East limb of the Sun.

This observation impressively demonstrates that LOFAR can really work as a dynamic spectroscopic radio imager of the Sun.
Copyright: Gottfried Mann, Christian Vocks, Frank Breitling
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