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dc.contributor.authorSpeirs, David
dc.contributor.authorCairns, R Alan
dc.contributor.authorKellett, Barry
dc.contributor.authorVorgul, Irena
dc.contributor.authorMcConville, Sandra
dc.contributor.authorCross, Adrian
dc.contributor.authorPhelps, Alan
dc.contributor.authorRonald, Kevin
dc.contributor.authorBingham, Robert
dc.identifier.citationSpeirs , D , Cairns , R A , Kellett , B , Vorgul , I , McConville , S , Cross , A , Phelps , A , Ronald , K & Bingham , R 2013 , ' Laboratory astrophysics : investigation of planetary and astrophysical maser emission ' , Space Science Reviews , vol. 178 , no. 2-4 , pp. 695-713 .
dc.identifier.otherPURE: 73112149
dc.identifier.otherPURE UUID: d8a9f00b-15fd-4aa9-ad3d-fe7dedc2f028
dc.identifier.otherScopus: 84887237737
dc.description.abstractThis paper describes a model for cyclotron maser emission applicable to planetary auroral radio emission, the stars UV Ceti and CU Virginus, blazar jets and astrophysical shocks. These emissions may be attributed to energetic electrons moving into convergent magnetic fields that are typically found in association with dipole like planetary magnetospheres or shocks. It is found that magnetic compression leads to the formation of a velocity distribution having a horseshoe shape as a result of conservation of the electron magnetic moment. Under certain plasma conditions where the local electron plasma frequency ωpe is much less than the cyclotron frequency ωce the distribution is found to be unstable to maser type radiation emission. We have established a laboratory-based facility that has verified many of the details of our original theoretical description and agrees well with numerical simulations. The experiment has demonstrated that the horseshoe distribution produces cyclotron emission at a frequency just below the local electron cyclotron frequency, with polarisation close to X-mode and propagating nearly perpendicularly to the electron beam motion. We discuss recent developments in the theory and simulation of the instability including addressing radiation escape problems, and relate these to the laboratory, space, and astrophysical observations. The experiments showed strong narrow band EM emissions at frequencies just below the cold-plasma cyclotron frequency as predicted by the theory. Measurements of the conversion efficiency, mode and spectral content were in close agreement with the predictions of numerical simulations undertaken using a particle-in-cell code and also with satellite observations confirming the horseshoe maser as an important emission mechanism in geophysical/astrophysical plasmas. In each case we address how the radiation can escape the plasma without suffering strong absorption at the second harmonic layer.
dc.relation.ispartofSpace Science Reviewsen
dc.rights© 2013, Springer Science+Business Media. This is the author created, accepted version manuscript. The final publication is available at
dc.subjectCyclotron maser emissionen
dc.subjectAuroral kilometric radiationen
dc.subjectUV Cetien
dc.subjectCU Virginusen
dc.subjectBlazer jetsen
dc.subjectAstrophysical shocksen
dc.subjectPlasma instabilitesen
dc.subjectQC Physicsen
dc.titleLaboratory astrophysics : investigation of planetary and astrophysical maser emissionen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Mathematics and Statisticsen
dc.contributor.institutionUniversity of St Andrews. Applied Mathematicsen
dc.description.statusPeer revieweden

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