Propagation and escape of astrophysical cyclotron-maser radiation

David C. D.C. Speirs, K. M. K.M. Gillespie, Kevin K. Ronald, S. L. S.L. Mcconville, Alan D R A.D.R. Phelps, Adrian W. A.W. Cross, Robert J. R.J. Bingham, Barry J. B.J. Kellett, R. Alan R.A. Cairns, Irena Yu I.Y. Vorgul

Research output: Contribution to conferencePaper

Abstract

A multitude of astrophysical plasma environments exist where a combination of particle acceleration, convergent magnetic fields and a sufficiently large ratio of electron cyclotron frequency to plasma frequency are present to support electron cyclotron-maser emission [1-6]. The resultant radiation signatures typically comprise of well-defined spectral components (around the relativistic electron cyclotron frequency) with near 100% left or right handed circular polarization when viewed out-with the source region. Although the generation mechanism has been well documented [7-25], there are numerous potential hindrances to the propagation and escape of the radiation from the source region, including issues of geometry/mode conversion [26] and coupling onto the dispersion branch connecting with vacuum propagation [12]. In the current context we consider the results of numerical Particle-in-cell (PiC) simulations conducted at the University of Strathclyde to study the spatial growth rate and emission topology of the cyclotron-maser emission process. The results have significant bearing on the radiation propagation characteristics and highly debated question of propagation/escape, with particular relevance to the planetary/stellar auroral magnetospheric case.
Original languageEnglish
Number of pages8
DOIs
Publication statusPublished - 4 Dec 2013
Event2013 19th IEEE Pulsed Power Conference (PPC) - San Francisco, United States
Duration: 16 Jun 201321 Jun 2013

Conference

Conference2013 19th IEEE Pulsed Power Conference (PPC)
CountryUnited States
CitySan Francisco
Period16/06/1321/06/13

Keywords

  • electron cyclotron maser
  • electron cyclotron resonance
  • astrophysical signals
  • auroral cyclotron maser
  • auroral kilometric radiation
  • auroral radio emission mechanisms
  • stellar polarimetry
  • stellar radiation
  • astrophysical plasma
  • plasma radiofrequency heating
  • plasma simulation
  • stellar atmospheres
  • stellar magnetism

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