Cyclotron masers and solar spike bursts |
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Authors: | D B Melrose |
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Institution: | (1) Research Centre for Theoretical Astrophysics School of Physics, University of Sydney, 2006, NSW, Australia |
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Abstract: | The theory of electron cyclotron maser emission and its application to solar spike bursts are reviewed. By analogy with the Earth's AKR, three sources of free energy are considered: a loss-cone anisotropy, a velocity-space hole, and a trapped distribution. The problem of how the radiation escapes through the second harmonic absorption layer is emphasized. Harmonic emission due to z mode coalescence may operate for some bursts, but the 2–5s delay between hard X-ray bursts and spike bursts suggests that some other mechanisms is required for most spike bursts. A model involving formation of a trapped distribution in low-density regions neighboring the flaring flux tube is considered. |
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Keywords: | Cyclotron masers solar radio emission solar flares |
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