Statistics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985angeo...3...63b&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 3, Jan.-Feb. 1985, p. 63-72.
Statistics
1
Earth Magnetosphere, Electrostatic Waves, Magnetic Equator, Wave Propagation, Cyclotron Radiation, Dense Plasmas, Electron Distribution, Gyrofrequency, Landau Damping, Magnetic Dipoles, Maxwell-Boltzmann Density Function, Propagation Modes, Trapping
Scientific paper
Results of a two-dimensional ray tracing computer code, based on Snell's law, for electrostatic wave propagation in a dipole magnetic field are discussed. A survey of possible ray paths varying a wide range of parameters is conducted for low-harmonic Bernstein modes in a high-density plasma. It is shown that the ray paths exhibit similarity with radial distance and that there exists the possibility of two classes of wave statistics of the equator: a broad emission region extending to about + or - 4 deg and a class of events restricted to the smaller region of 1-2 deg about the magnetic equator. The regulating parameter between these two types of events is the transition energy from the isotropic background electrons to the unstable distribution of superthermals. Ray paths for propagation in the magnetic equatorial plane are considered and an explanation is given for ray focusing in the equatorial plane based on electron gyroradius considerations.
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