Hard X-ray Emission from a Flare-related Jet

Physics

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Scientific paper

We report the observation of hard X-ray emission which we attribute to a flare-related jet. The event occurred on the 22nd of August 2002 and its evolution was observed by a number of instruments. In particular we study the pre-impulsive and impulsive phase of the flare using data from RHESSI and the TRACE 195 passband. During this period RHESSI observes significant hard X-ray emission to energies as high as 50 keV in the jet. Estimates from RHESSI spectroscopy suggest a temperature of the order of approximately 20MK for this time. Radio observations from the Nobeyama Radioheliograph (NoRH) show a positive spectral index for the ejected material backing the presence of non-thermal emission. This also shows the jet to be optically thick at radio frequencies, possibly due to free-free absorption.

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