A new concept for detecting electromagnetic and electrostatic waves in space plasmas

Details A new concept for detecting electromagnetic and electrostatic waves in space plasmas A new concept for detecting electromagnetic and electrostatic waves in space plasmas

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24.1097g&link_type=abstract

Planetary and Space Science, vol. 24, Nov. 1976, p. 1097-1104.

Computer Science

Cold Plasmas, Cosmic Plasma, Earth Magnetosphere, Electromagnetic Measurement, Electromagnetic Radiation, Electrostatic Waves, Current Density, Earth Atmosphere, Electrostatic Probes, Jupiter Atmosphere, Magnetospheric Electron Density, Plasma Diagnostics

Scientific paper

A technique and system are proposed for detecting electromagnetic and electrostatic waves propagating in space plasmas by measuring the conduction current associated with the waves. The system consists of a probe (e.g., conductive elements of a spacecraft surface) connected to an electron emitter through a current-measuring device; the flow of electrons impinging on the collecting electrode can thus be evaluated before being returned to the medium. Theoretical considerations are reviewed, and the feasibility of the measurements is demonstrated using the example of electrostatic waves propagating at the plasma frequency (the electron acoustic mode) in an energetic isotropic medium. Effects of plasma inhomogeneities around the probe, nonuniform wave fields, and electron-density inhomogeneities are examined. It is shown that the sensitivity of the proposed wave-measurement system is comparable to that of an electric dipole with a length of the order of the Debye length, which is equal to hundreds of meters in a magnetospheric environment.

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