A Rapidly Moving Hard X-Ray Source in a CME

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We have observed a high-speed coronal ejection in hard X-rays, detectable to an altitude of some 2 times 105 km in the Yohkoh 33-53 keV energy bands. Simultaneous imaging at 17 and 34 GHz from the Nobeyama Radio Observatory shows complex moving features simultaneous with the ejection, including a compact source that we identify with the rapid X-ray source motion. The hard X-ray and microwave observations agree upon ejection velocities in the vicinity of 1000 km s-1. The hard X-ray sources also corresponded in position angle to a bright coronal mass ejection detected about 15 minutes later, and to both fast-drift and slow-drift radio bursts in the decimeter-meter bands. Other components of coronal hard X-ray emission were also detected, including an extended long-duration event with a hard spectrum. We suggest that a major eruptive flare occurred in NOAA region 9415, approximately 26circ beyond the W limb at the time of the event. Estimating a source density of 4 times 109 cm-3 from the compact source observed at 17 GHz, we find a total electron number (> 20 keV) of approximately N20 ~2.5 times 1035 for the compact part of the source.

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