Electron acceleration in connection with radio noise storm onsets or enhancements

Details Electron acceleration in connection with radio noise storm onsets or enhancements Electron acceleration in connection with radio noise storm onsets or enhancements

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..577v&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

Radio noise storms are generated by suprathermal (≃ 10 keV)
electrons accelerated continuously over time scales of hours or days in active region magnetic fields. They are related to emerging magnetic loops interacting with overlying loops and leading to magnetic coronal reconfiguration (e.g. Bentley et al. 2000). Noise storm onsets or enhancements have been sometimes observed in association with a flare-like sudden energy release in the active region producing a localized microwave (Raulin et al. 1991) or soft X-ray brightening (Raulin & Klein 1994). A few cases have also been reported in which 10-30 keV emission from a superhot plasma or from non-thermal electrons have been observed at the onset of noise storms (Crosby et al. 1996) confirming that a flare-like energy release in the lower corona could be a necessary condition for noise storms to start. No spatially resolved hard X-ray observations were however available in the case of the latter analysis, allowing to check that the flare-like emission and the noise storm were originating from the same active region. We present here an event for which both radio and hard X-ray (HXR) spatially resolved observations are available.

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