Electrostatic noise in non-Maxwellian plasmas - 'Flat-top' distribution function

Details Electrostatic noise in non-Maxwellian plasmas - 'Flat-top' distribution function Electrostatic noise in non-Maxwellian plasmas - 'Flat-top' distribution function

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415407c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15407-15414.

Physics

11

Electron Plasma, Noise Spectra, Plasma Diagnostics, Space Plasmas, Spectral Energy Distribution, Electromagnetic Noise, Plasma Spectra, Thermal Noise

Scientific paper

Calculations of the electrostatic noise spectrum as measured by an antenna immersed in a plasma with a 'flat-top' electron velocity distribution function are performed for frequencies of the order of the plasma frequency. It is found that the main part of the spectrum is nearly the same as the thermal noise in a Maxwellian plasma with the same density and equivalent temperature, while the peak near f(p) depends on the high-energy tail of the distribution. Both wire dipole and double-sphere antennas are described along with some practical consequences for plasma wave measurements in the earth magnetosheath.

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