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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 3
Ann. Geophys., 18, 277-284, 2000
https://doi.org/10.1007/s00585-000-0277-6
© European Geosciences Union 2000
Ann. Geophys., 18, 277-284, 2000
https://doi.org/10.1007/s00585-000-0277-6
© European Geosciences Union 2000

  31 Mar 2000

31 Mar 2000

Detection of zero anisotropy at 5.2 AU during the November 1998 solar particle event: Ulysses Anisotropy Telescopes observations

S. Dalla and A. Balogh S. Dalla and A. Balogh
  • The Blackett Laboratory, Imperial College, London, SW7 2BZ, UK
  • E-mail: s.dalla@ic.ac.uk
  • Correspondence to: S. Dalla

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°S. 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.

Key words: Interplanetary physics (energetic particles) - Solar physics, astrophysics and astronomy (energetic particles) - Space plasma physics (instruments and techniques)

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