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Edward Schmahl   Submitted: 2005-08-17 14:25

We present an analysis of five microflares, three observed simultaneously by RHESSI in hard X-rays and Nobeyama RadioHeliograph (NoRH) in microwaves (17 GHz) and two observed by RHESSI and Nançay RadioHeliograph (NRH) at metric wavelengths (150-450 MHz). Since we have no radio imaging telescopes simultaneously operating at microwave and meter wavelengths in the same time zone, we are obliged to use a different set of metric events in contrast to that used for comparison with the two radio wavelengths. We are interested in using the locations and other imaging characteristics of the events from both RHESSI and radio observations instead of just temporal correlation. So we've used the Nançay (France) metric radioheliograph at 150-450 MHz for this purpose. Here we describe the properties of five events - three in microwaves and two at metric wavelengths. We discuss the brightness temperatures, emission measures and the hard X-ray spectral properties of these microevents. One sees small (mini) flaring loops clearly in NoRH and RHESSI images. The microwave emission often seems to come from the RHESSI foot points (for higher energies), and from the entire small (mini) flaring loop (for lower energies).The RHESSI microflares seem to be associated in position with metric type III bursts. Frequently, the hard X-ray spectrum of the microwave associated RHESSI microflares can be fit by a thermal component at low energies (sim 3-12 keV) and a nonthermal component at higher energies (sim 12-20 keV).

Authors: Kundu, Trottet, Grigis & Schmahl
Projects: RHESSI

Publication Status: Adv. Spa. Res. in press
Last Modified: 2005-08-18 13:12
Go to main E-Print page  RHESSI and Microwave Imaging Observations of Two Solar Flares  X-ray quasi-periodic pulsations in solar flares as magnetohydrodynamic oscillations  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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