Evidence for earth magnetospheric tail associated phenomena at 3100 R sub E

Details Evidence for earth magnetospheric tail associated phenomena at 3100 R sub E Evidence for earth magnetospheric tail associated phenomena at 3100 R sub E

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..585i&link_type=abstract

Geophysical Research Letters, vol. 6, July 1979, p. 585-588.

Physics

7

Geomagnetic Tail, Pioneer 7 Space Probe, Plasma Flux Measurement, Energy Spectra, Ion Motion, Jupiter Atmosphere, Solar Wind

Scientific paper

Examination of Pioneer 7 NASA Ames Research Center plasma analyzer data obtained in February 1977 at about 3100 earth radii, downstream from earth in the vicinity of the expected extended geomagnetic tail indicate that tail-related phenomena may have been observed. These observations are characterized by intermittent intervals of extremely low levels of plasma ion flux. Corresponding Prognoz 5 Space Research Institute plasma ion data obtained in the vicinity of earth indicate typical solar-wind flux levels and a relatively steady character of the solar wind during this time. These recent Pioneer 7 observations in the vicinity of the expected geomagnetic tail at about 3100 earth radii are consistent with earlier Pioneer 7 observations in September 1966 at about 1000 earth radii and Pioneer 8 observations in January 1968 at about 500 earth radii and represent the most extended positive observational information of the extended nature of the geomagnetic tail. These measurements suggest that at times Jupiter's magnetosphere may have tail-associated phenomena extending to distances of about 10 AU downstream from the planet. These measurements also raise the possibility that at times comets may have tail-associated phenomena extending downstream from the visible tail.

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