A theoretical study of the direction and polarization of solar radio millisecond spike radiation

Astronomy and Astrophysics – Astrophysics

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Electromagnetic Pulses, Polarization (Waves), Solar Radio Bursts, Electron Cyclotron Heating, Magnetic Mirrors, Masers, Plasma Waves

Scientific paper

The angular direction and polarization of the solar radio millisecond spike emission were investigated using a model in which the spike emission is due to the second harmonic instability modes driven by electron cyclotron maser of loss cone distributed electrons during the propagation of a nonlinear plasma density wave near the magnetic mirror. It is found that, when the angle theta between the wave vector and the magnetic field is greater than 60 deg, the emission is in 100 percent X-mode polarization; when theta is between 40 and 60 deg, the emission is in 100 percent O-mode polarization provided the amplitude of the density wave is below a certain limit; above that limit, the polarization will fall from 100 percent O-mode to even the X-mode. It is also found that only 0.1 percent of the free energy of energy carrying electrons in the source region is converted into radiation wave energy.

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