Plasma irregularities in the comet's tail

Details Plasma irregularities in the comet's tail Plasma irregularities in the comet's tail

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210..254l&link_type=abstract

Astrophysical Journal, vol. 210, Nov. 15, 1976, pt. 1, p. 254-257.

Astronomy and Astrophysics

Astrophysics

6

Comet Tails, Electron Density (Concentration), Kohoutek Comet, Magnetohydrodynamic Turbulence, Radio Occultation, Scintillation, Extragalactic Radio Sources, Kolmogoroff Theory, Magnetic Field Configurations, Plasma Density, Power Spectra

Scientific paper

Scintillation theory is invoked to explain fluctuations in radio intensity observed during occultation of the extragalactic radio source PKS 2025-15 by the plasma tail of comet 1973 XII on Jan. 5, 1975. Plasma irregularities and turbulence in the tail of the comet (Kohoutek 1973f) are fitted to a Gaussian spectrum and to a Kolmogorov power-law spectrum in analyzing the scintillation data. The rms fluctuation of electron density in the cometary tail is reported at 80 electrons per cu mm, the inner scale of the fluctuation at 800 km, and the largest scale of fluctuation at possibly 400,000 km. A hump in the comet power-law spectrum is noted. Use of the power spectrum of electron density fluctuations to predict the power spectrum of magnetic field fluctuations for irregularities associated with hydromagnetic turbulence is recommended.

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