Mechanism of VLF emission from photoelectrons in the upper ionosphere

Details Mechanism of VLF emission from photoelectrons in the upper ionosphere Mechanism of VLF emission from photoelectrons in the upper ionosphere

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ge%26ae..26..416g&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 26, May-June 1986, p. 416-420. In Russian.

Physics

Ionospheric Electron Density, Magnetohydrodynamic Stability, Photoelectrons, Plasma Resonance, Plasma Waves, Radio Emission, Coulomb Collisions, Geomagnetism, Kinetic Equations, Plasma Density, Space-Time Functions, Velocity Distribution, Very Low Frequencies

Scientific paper

The kinetic equation for photoelectrons is solved numerically, taking the excitation of plasma waves at lower hybrid resonance into account. It is shown that there exists a bounded space-time domain (the main ionospheric trough at morning hours) where the photoelectron flux anisotropy can lead to the generation of VLF waves detectable by ground-based instruments. In a rarefied plasma (not greater than 1000/cu cm) the nonmonotonic velocity distribution of photoelectrons is due to the geomagnetic-field nonuniformity; in a denser plasma (about 10,000/cu cm), it is due to pitch-angle diffusion in the case of Coulomb scattering.

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