Ion thermal noise in the solar wind - Interpretation of the 'excess' electric noise on ISEE 3

Details Ion thermal noise in the solar wind - Interpretation of the 'excess' electric noise on ISEE 3 Ion thermal noise in the solar wind - Interpretation of the 'excess' electric noise on ISEE 3

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3294m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3294-3298.

Physics

21

International Sun Earth Explorer 3, Solar Wind, Thermal Noise, Doppler Effect, Ion Temperature, Low Frequencies, Solar Wind Velocity, Spacecraft Antennas

Scientific paper

The excess electric noise component with a ω-1 power spectrum, previously identified on ISEE 3 below the plasma frequency, is quantitatively interpreted. The theory is based on quasi-thermal electron noise to which two effects are added: (1) ion quasi-thermal noise Doppler-shifted by the solar wind velocity and (2) less important, particle impacts on and emission from the antennas. The theory is in excellent agreement with the observations for the long S wire antenna (L = 45 m) on which the impact noise is negligible. For the Z antenna which has a larger surface area, the contributions of both effects are necessary to interpret the measurements. These results could be used to give an independent measurement of the solar wind velocity magnitude and direction whenever the plasma frequency exceeds the lowest frequency channel (30 kHz) of the receiver.

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