[Simpson 1992 a]
Energetic charged-particle phenomena in the Jovian magnetosphere
First results from the Ulysses COSPIN collaboration
J. A. Simpson, J. D. Anglin, A. Balogh,
J. R. Burrows, S. W. H. Cowley, P. Ferrando,
B. Heber, R. J. Hynds, H. Kunow and R. G. Marsden.
Energetic charged-particle phenomena in the Jovian magnetosphere - First
results from the Ulysses COSPIN collaboration.
Science 257, 1543-1550. 1992
Contents
The Ulysses spacecraft made the first exploration of the region of Jupiter's
magnetosphere at high Jovigraphic latitudes on the dusk side and reached
higher magnetic latitudes on the day side than any previous mission to
Jupiter.
The cosmic and solar particle investigations (COSPIN) instrumentation achieved
a remarkably well integrated set of observations of energetic charged particles
in the energy ranges of about 1 to 170 MeV for electrons and 0.3 to
20 MeV for protons and heavier nuclei.
The new findings include an apparent polar cap region in the northern
hemisphere in which energetic charged particles following Jovian magnetic field
lines may have direct access to the interplanetary medium; high-energy electron
bursts on the dusk side that are apparently associated with field-aligned
currents and radio burst emissions; persistence of the global 10-hour
relativistic electron 'clock' phenomenon throughout Jupiter's magnetosphere;
on the basis of charged-particle measurements, apparent dragging of magnetic
field lines at large radii in the dusk sector toward the tail; and consistent
outflow of MeV electrons and large-scale departures from corotation for
nucleons.
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