Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh21b..03z&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #SH21B-03
Physics
2104 Cosmic Rays, 2116 Energetic Particles, Planetary, 2159 Plasma Waves And Turbulence, 2162 Solar Cycle Variations (7536), 6220 Jupiter
Scientific paper
Since the first approach by Pioneer 10 in 1972, Jupiter is known to be the source of relativistic electrons that dominate the radiation environment of the entire inner heliosphere during solar quiet periods. Jets of relativistic electrons were observed when the spacecraft got within short distances of a fraction of 1 AU from the magnetosphere. Because it is a point source, one can use the spatial distribution of jovian electrons to figure out the properties of particle propagation such as the diffusion coefficient parallel or perpendicular to the magnetic field. Ulysses' unique out-of-ecliptic trajectory has made it possible to study particle propagation in the latitudinal direction. From the measurements during Ulysses first encounter with Jupiter in 1992 and subsequent polar orbits, it was found that the particle latitudinal transport should be enhanced at high heliographic latitudes relative to that near the solar equator. Twelve years later, Ulysses returns to Jupiter's orbit with a closest encounter with the planet in February 2004. Relativistic electron intensity has been increasing steadily towards Jupiter. In this paper, an analysis of electron measurements made by the HET of COSPIN experiment will be presented. The results will be compared with previous results to find out any solar cycle dependence of the jovian source and the particle propagation in the interplanetary magnetic field. Implication to the propagation of solar energetic particles and cosmic rays will be discussed.
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