Generation and propagation of cyclotron maser emissions in the finite auroral kilometric radiation source cavity

Details Generation and propagation of cyclotron maser emissions in the finite auroral kilometric radiation source cavity Generation and propagation of cyclotron maser emissions in the finite auroral kilometric radiation source cavity

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1437p&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A12, pp. SMP 13-1, CiteID 1437, DOI 10.1029/2002JA009403

Physics

Plasma Physics

36

Ionosphere: Plasma Waves And Instabilities, Ionosphere: Wave/Particle Interactions, Magnetospheric Physics: Auroral Phenomena (2407), Space Plasma Physics: Numerical Simulation Studies

Scientific paper

The properties of the electron-cyclotron maser radiation produced in the auroral kilometric radiation (AKR) source cavity are investigated by means of two-dimensional particle-in-cell simulations and observations made by the Fast Auroral SnapshoT (FAST) Explorer. The simulations assume a population of primary auroral electrons with a downgoing shell distribution. Driven simulations in a meridional plane with a finite magnetic field gradient demonstrate that the maser radiation builds up very rapidly with decreasing altitude and that bursts of radiation with timescales of the order of 0.5 ms are produced at only 5-6 km below the injection level. Initial value simulations in a longitudinal plane show that the radiation component striking the cavity boundary at normal incidence is damped away via particle absorption and conversion to the Z mode. In contrast, the longitudinally propagating component is able to be amplified along an extended path length. The FAST observations of the electric field in the source region reveal that the polarization in the plane perpendicular to the ambient magnetic field varies between being approximately isotropic to having a substantial (as much as a factor of 100) enhancement of the ``along-track'' polarization. No evidence is found that the ``across-track'' polarization is ever dominant, and thus the AKR emissions do not form a standing wave structure between the cavity boundaries.

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