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Location of Decimetric Pulsations in Solar Flares View all abstracts by submitter

Arnold Benz   Submitted: 2011-03-28 08:01

This work investigates the spatial relation between coronal X-raysources and coherent radio emissions, both generally thought to besignatures of particle acceleration. Two limb events were selectedduring which the radio emission was well correlated in time with hardX-rays. The radio emissions were of the type of decimetric pulsationsas determined from the spectrogram observed by Phoenix-2 of ETHZurich. The radio positions were measured from observations with theNançay Radioheliograph between 236 and 432 MHz and compared to theposition of the coronal X-ray source imaged with RHESSI. The radiopulsations originated at least 30 - 240 Mm above the coronal hardX-ray source. The altitude of the radio emission increases generallywith lower frequency. The average positions at different frequenciesare on a line pointing approximately to the coronal hard X-ray source.Thus, the pulsations cannot be caused by electrons trapped in theflare loops, but are consistent with emission from a current sheetabove the coronal source.

Authors: Arnold O. Benz, Marina Battaglia and Nicole Vilmer
Projects: RHESSI

Publication Status: Solar Physics (in press)
Last Modified: 2011-03-28 08:23
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Alfvén waves  Observing Flux Rope Formation During the Impulsive Phase of a Solar Eruption  Edit Entry  Download Preprint  Delete Entry 

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