Polar CAP photoionization and the ten-hour clock at Jupiter

Details Polar CAP photoionization and the ten-hour clock at Jupiter Polar CAP photoionization and the ten-hour clock at Jupiter

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.6304g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, July 1, 1985, p. 6304-6310. DOE-sponsored research.

Physics

7

Jupiter Atmosphere, Photoionization, Planetary Magnetic Fields, Planetary Magnetospheres, Polar Caps, Space Plasmas, Electron Energy, Energy Spectra, Ionospheric Conductivity, Magnetic Anomalies, Planetary Ionospheres, Jupiter, Polar Regions, Ice Caps, Photoionization, Spectra, Electrons, Magnetosphere, Particles, Modulation, Magnetic Fields, Conductivity, Electrical Properties, Latitude, Ionosphere, Anomalies, Energy, Surface, Magnetic Properites

Scientific paper

It is shown that the clock-like modulation of the spectral index of energetic electrons (greater than 2 MeV) in the outer Jovian magnetosphere is due to a periodic shift of the particle energy spectrum toward higher and lower energies. This shift results in a modulation of the spectral index when the spectrum is not a pure power law in energy. It is suggested that the periodic energization is due to a periodic modulation of the magnetic field in the outer magnetosphere. This modulation is caused by a variation of the longitudinally averaged Pedersen conductivity due to the asymmetric solar illumination of the trace of the magnetodisk in the high-latitude ionospheres. Such a modulation requires the presence of a surface magnetic anomaly.

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