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For the first time during the mission, the\udAnisotropy Telescopes instrument on board the Ulysses spacecraft measured\udconstant zero anisotropy of protons in the 1.3-2.2 MeV energy range, for a\udperiod lasting more than three days. This measurement was made during the\udenergetic particle event taking place at Ulysses between 25 November and 15\udDecember 1998, an event characterised by constant high proton fluxes within a\udregion delimited by two interplanetary forward shocks, at a distance of 5.2 AU\udfrom the Sun and heliographic latitude of 17°S. We present the ATs results for\udthis event and discuss their possible interpretation and their relevance to the\udissue of intercalibration of the two telescopes.  <b>Key words:</b> Interplanetary physics (energetic particles)\ud- Solar physics, astrophysics and astronomy (energetic particles) - Space plasma\udphysics (instruments and techniques

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