Letter | Published:

Relation between solar narrow-band decimetre-wave bursts and associated X-ray bursts

Nature volume 321, pages 421423 (22 May 1986) | Download Citation

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Abstract

Theoretical models have been proposed, stimulated by a successful account of the jovian decametric radiation1, for a maser mechanism, or a normal relativistic cyclotron resonance mechanism, operating in solar flares, and for transport of energy across magnetic fields to the electron gas by maser-amplified radio waves2. Much effort has been directed towards observations of solar-flare radio spike bursts3–8. Here we compare solar narrow-band decimetre-wave spike bursts with corresponding X-ray events for 25 solar flares. We find that decimetre spike bursts are 102–103 times stronger than normal impulsive microwave bursts for the same observed amount of hard X-ray emission. This feature, along with the observation of 100% circular polarization, strongly supports a maser origin for the decimetre spike bursts.

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Author information

Affiliations

  1. Toyokawa Observatory, Nagoya University, Toyokawa 442, Japan

    • Shinzo Enome
  2. Code 682, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA

    • Larry E. Orwig

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DOI

https://doi.org/10.1038/321421a0

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