[Heber 1995 b]
Modulation of galactic cosmic ray particles observed on board the ULYSSES
spacecraft.
B. Heber, A. Raviart, C. Paizis, W. Droege, R. Ducros,
P. Ferrando, H. Kunow, R. Müller-Mellin, C. Rastoin
and K. Röhrs.
Modulation of galactic cosmic ray particles observed on board the ULYSSES
spacecraft.
Advances in Space Research 16, (9)205-(9)208. 1995
Contents
The cosmic ray flux observed with the Kiel Electron Telescope on board the
ULYSSES spaceprobe varies with solar activity as well as with heliospheric
position.
Determination of spatial gradients requires a careful analysis of the
influences of the current sheet tilt angle, the number of major solar
flares, interplanetary shocks and interaction regions evolving in the
expanding solar wind.
In this paper we concentrate on nuclei with rigidity above 1 GV/c.
We discuss the effects of the variable solar activity in the declining phase of
the present solar cycle and the variation with radial distance during the in
ecliptic mission period as a basis for separating latitudinal effects.
We show that during this phase of the solar cycle modulation of
GV/c nuclei is ordered by temporal evolution, radial distance and small
latitudinal effects up to latitudes of 50° South.
We discuss the influence on GV/c nuclei of a disturbance in
early 1994 when ULYSSES was beyond 50° South.
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