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Observations of a Radio-quiet Solar Preflare View all abstracts by submitter

Arnold O. Benz   Submitted: 2017-09-25 01:20

The preflare phase of the flare SOL2011-08-09T03:52 is unique in its long duration, its coverage by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and the Nobeyama Radioheliograph, and the presence of three well-developed soft X-ray (SXR) peaks. No hard X-rays (HXR) are observed in the preflare phase. Here we report that also no associated radio emission at 17 GHz was found despite the higher sensitivity of the radio instrument. The ratio between the SXR peaks and the upper limit of the radio peaks is larger by more than one order of magnitude compared to regular flares. The result suggests that the ratio between acceleration and heating in the preflare phase was different than in regular flares. Acceleration to relativistic energies, if any, occurred with lower efficiency.

Authors: Arnold O. Benz, Marina Battaglia, Manuel G?del
Projects: None

Publication Status: Accepted by Solar Physics
Last Modified: 2017-09-25 10:57
Go to main E-Print page  Comparison of Helioseismic Far-side Active Region Detections with STEREO Far-Side EUV Observations of Solar Activity  Energy release in the solar atmosphere from a stream of infalling prominence debris  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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