Latitudinal Effects of Galactic Cosmic Rays Observed Onboard
the Ulysses Spacecraft
C. Paizis, B. Heber, A. Raviart, R. Ducros,
P. Ferrando, H. Kunow, R. Müller-Mellin, C. Rastoin,
H. Sierks und G. Wibberenz.
Latitudinal Effects of Galactic Cosmic Rays Observed Onboard the Ulysses
Spacecraft.
Proceedings of the 24th International Cosmic Ray Conference
4, 756-759. 1995
Contents
After its Jupiter fly-by in February 1992, Ulysses climbed up in
helioaltitude, while moving inwards towards the Sun, to reach a maximum
value of 80° in September 1994 and cross again the ecliptic plane
in March 1995. This part of the trajectory offers the opportunity to
study latitudinal effects over a latitude range much wider than
previous spacecraft have explored. Using COSPIN/KET measurements in
combination with data from Earth-anchored experiments, the authors
have disentangled spatial and temporal variations and investigated
the latitudinal effects of hadrons at about 2 GV and 15 GV rigidity.
They also used data from the in-Ecliptic phase of the mission to
estimate the radial gradient at the same rigidities. They found
for 2 GV hadrons a radial gradient of 3 to 3.5%/AU and a latitudinal
gradient of 0.3 - 0.4%/deg and for 15.5 GV hadrons a radial gradient
of 1.3 to 1.7%/AU and a latitudinal gradient of 0.2 - 0.3%/deg.
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