Ann. Geophys.,18, 3, 277 - 284, 2000
Abstract:
For the first time during the mission, the Anisotropy Telescopes
instrument on board the Ulysses spacecraft measured constant zero
anisotropy of protons in the 1.3-2.2 MeV energy range, for a period
lasting more than three days. This measurement was made during the
energetic particle event taking place at Ulysses between 25 November
and 15 December 1998, an event characterised by constant high proton
fluxes within a region delimited by two interplanetary forward shocks,
at a distance of 5.2 AU from the Sun and heliographic latitude of 17
degrees South. We present the ATs results for this event and discuss
their possible interpretation and their relevance to the issue of
intercalibration of the two telescopes.
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