Type III Radio Bursts and Microflares

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present recent observations of microflares observed simultaneously in EUV (TRACE), radio (Nancay, Phoenix-2), and X-rays (RHESSI). During a period of 15 min on 19 July 2002 14:23-14:35 UT, RHESSI observed microflares approximately every 2 minutes. Each microflare was accompagnied by a radio Type III burst. The largest flare (14:29:25 UT) was also accompagnied by a cluster of decimetric radio spikes in the frequency range 1 to 2 GHz. In addition, FeXII (195 Å) images provided by TRACE show two jets-like emissions originating from a complex double arche structure. The centroid of the jets were found to travel at apparent speeds of ˜ 100 km s-1, consistent with observations by Shimojo et al. (1996). X-ray images show non-thermal emission (9-30 keV) from the footpoints of the TRACE arches. Strong correlation in flux amplitude is found between emissions in the radio ( ˜1340 MHz) and non-thermal X-ray (9-30 keV integrated). The event is interpreted as an anemone-jet in the model by Shibata et al. (1994). This research is supported by NASA contract NAS 5-98033.

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