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High-sensitivity observations of solar flare decimeter radiation View all abstracts by submitter

Arnold O. Benz   Submitted: 2000-12-05 01:40

A new acousto-optic radio spectrometer has observed the 1 - 2 GHz radio emission of solar flares with unprecedented sensitivity. The number of detected decimeter type III bursts is greatly enhanced compared to observations by conventional spectrometers observing only one frequency at the time. The observations indicate a large number of electron beams propagating in dense plasmas. For the first time, we report weak, reversed drifting type III bursts at frequencies above simultaneous narrowband decimeter spikes. The type III bursts are reliable signatures of electron beams propagating downward in the corona, apparently away from the source of the spikes. The observations contradict the most popular spike model that places the spike sources at the footpoints of loops. Conspicuous also was an apparent bidirectional type U burst forming a fish-like pattern. It occurs simultaneously with an intense U-burst at 600-370 MHz observed in Tremsdorf. We suggest that it intermodulated with strong terrestrial interference (cellular phones) causing a spurious symmetric pattern in the spectrogram at 1.4 GHz. Symmetric features in the 1 - 2 GHz range, some already reported in the literature, therefore must be considered with utmost caution.

Authors: Arnold O. Benz, Peter Messmer and Christian Monstein
Projects: None

Publication Status: Astronomy and Astrophysics, 366, 326 - 330 (2001)
Last Modified: 2005-11-21 03:34
Go to main E-Print page  On the Temporal Relationship Between Coronal Mass Ejections and Flares  Heating the Quiet Corona by Nanoflares: Evidence and Problems  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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