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| Titel |
First LOFAR's Observation of a Solar Radio Burst |
| VerfasserIn |
G. Mann, C. Vocks, F. Breitling |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250059381
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| Zusammenfassung |
| LOFAR is a new radio interferometer covering the frequency range 30-240Â MHz.
Therefore, it is worth to use it for observations of the radio Sun. LOFAR was originally
designed by ASTRON in the Netherlands. It consists of a sample of stations distributed over
Europe. The radio signals of each station are transfered via a 10Â Gbit/s data link to the
BlueGene super-computer in Groningen, where they are correlated to a radio map of the
sky.
During LOFAR’s commissioning phase, LOFAR observed a solar radio burst on March
17, 2011 for the first time. It appears as a local enhancement of the radio radiation at
150Â MHz at the west limb of the Sun. A careful comparison of the radio data with EUV
images as delivered by the AIA instrument of NASA’s Solar Dynamic Observatory reveals
that the radio burst happens in an active region and is temporally correlated with the
appearance of a plasma jet. Such a jet occurs as the result of magnetic reconnection. This
event evidently shows that magnetic reconnection, especially the plasma-jet interaction, leads
to the generation of energetic electrons which are needed for the nonthermal radio
radiation. |
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