Effects of a finite plasma temperature on electron-cyclotron maser emission

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Electron Cyclotron Heating, Masers, Planetary Radiation, Plasma Temperature, Stellar Radiation, Damping, Kilometric Waves, Plasma Frequencies, Plasma Radiation, Propagation Modes, Solar Radio Bursts, Space Plasmas

Scientific paper

Auroral kilometric radiation, Jupiter's decametric radio emission, and microwave spike bursts have all been attributed to the semirelativistic maser instability. The effect of a finite plasma temperature on the emission from this instability is investigated. Temperature effects reduce the frequency of the x mode and thereby enable fundamental x-mode radiation to occur at higher omegap/Omega sub e (where omegap is the plasma frequency and Omegae is the electron-cyclotron frequency). When the plasma frequency is sufficiently high to suppress x-mode growth, z-mode growth then dominates. The z-mode radiation is, however, subject to electron-cyclotron damping, and this damping can cause heating of the plasma in the vicinity of the source region. In this case, x-mode radiation can be generated even though initial conditions might favor z-mode growth.

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