Measurements of the magnetic field orientation in the Jovian ionosphere deduced from Pioneer 10 and 11 scintillation observations

Details Measurements of the magnetic field orientation in the Jovian ionosphere deduced from Pioneer 10 and 11 scintillation observations Measurements of the magnetic field orientation in the Jovian ionosphere deduced from Pioneer 10 and 11 scintillation observations

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.5245w&link_type=abstract

Journal of Geophysical Research, vol. 83, Nov. 1, 1978, p. 5245-5255.

Astronomy and Astrophysics

Astronomy

1

Ionospheric Electron Density, Jupiter Atmosphere, Planetary Ionospheres, Planetary Magnetic Fields, Radio Occultation, Scintillation, Spaceborne Astronomy, Atmospheric Turbulence, Collisional Plasmas, Lower Ionosphere, Magnetic Measurement, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Plasma Turbulence, Magnetic Fields, Scintillations, Jupiter, Ionosphere, Pioneer 10, Electrons, Density, Spectrum, Abundance, Radio Occultation, Wave Propagation, S-Band, Pioneer 11

Scientific paper

In this paper the S band scintillations observed during the Pioneer 10 and 11 occultation measurements of Jupiter are analyzed. It is found that while the electron density irregularities are isotropic in the collision-dominated lower ionosphere, they are anisotropic in the upper ionosphere because of alignment along the magnetic field. By using Rytov's approximation the frequency spectrum of the log-amplitude scintillations is derived for a wave propagating in an anisotropic turbulent medium. It is shown that the spectrum depends to a large extent on the direction of anisotropy and is therefore useful for measuring the orientation of the magnetic field in regions that have not yet been probed by direct measurements. This new technique is applied to the Pioneer 10 and 11 observations, and is used to deduce the first measurements of magnetic field orientation in the ionosphere of Jupiter.

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