Relativistic electron and ion modulation measured on Ulysses:HISCALE instrument background

Physics

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2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514)

Scientific paper

We present the results of the analysis of the heliographic latitude variation of the background counting rates (MFSA channels) in the HISCALE instrument on board the Ulysses spacecraft during the first Ulysses fast latitude scan (day 257 of 1994 to day 212 of 1995). The background rates are found to decrease between the heliographic latitudes of 20-60 degrees on both sides of the heliospheric equator, and to increase at heliolatitudes between 0 and +/-20 degrees to values approximately as measured over the solar poles, >60 degrees. The modulation of 0.3-2.1 GeV protons and helium is seen clearly by the COSPIN:KET detector at heliographic latitudes <60 degrees, but these ion rates remain low during Ulysses' passage through perihelion. We conclude that the systematic decrease in the background at heliographic latitudes <60 degrees is likely the result of the modulation of relativistic galactic electrons and ions, and that the recovery of the background rates during the Ulysses ecliptic crossing is due to relativistic electrons, probably of Jovian origin. The result of this analysis may also be used to better understand the propagation of electrons perpendicular to the ecliptic.

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