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Maser Emission in Astrophysical Plasmas: 2003 Robert Ellery Lecture

Published online by Cambridge University Press:  05 March 2013

Don Melrose
Don Melrose*
Affiliation:
School of Physics, University of Sydney, Sydney NSW 2006, Australia. Email: melrose@physics.usyd.edu.au
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Abstract

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There are three distinct types of ‘coherent emission’ in astrophysical plasmas: plasma emission (e.g. in solar radio bursts), electron cyclotron maser emission (e.g. in Jupiter's radio bursts), and pulsar radio emission. The development and current status of our understanding of coherent emission is reviewed, concentrating on plasma emission and electron cyclotron maser emission for which there is direct information on the distributions of electrons that produce the radiation. A generic model for a coherent emission process involves a maser generating radiation in a natural mode of the ambient plasma, and operating near marginal stability. A specific coherent emission mechanism involves the form of free energy to drive the maser, a pump that provides the free energy, and the plasma instability that leads to wave growth. The nature of coherence and its measurement through higher order intensity correlations are discussed.

Keywords

radio continuum: generalplasmasmasersinstabilities
Type
ASA Conference 2004
Information
Publications of the Astronomical Society of Australia , Volume 22 , Issue 2 , 2005 , pp. 144 - 152
Copyright
Copyright © Astronomical Society of Australia 2005

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