[Heber 1996 b]
Spatial variation of > 106 MeV proton fluxes observed
during the Ulysses rapid latitude scan: Ulysses COSPIN/KET results
B. Heber, W. Dröge, P. Ferrando, H. Kunow,
R. Müller-Mellin, C. Paizis, A. Raviart and G. Wibberenz.
Spatial variation of > MeV proton fluxes observed during the
Ulysses rapid latitude scan: Ulysses COSPIN/KET results.
Geophysical Research Letters 23 (12), 1513-1516.
Contents
The authors present measurements of galactic proton fluxes with energies
above 106 MeV made by the Kiel Electron Telescope on board the Ulysses
spacecraft during the fast scan form the south polar passage in September
1994 to the north pole in August 1995, under solar minimum conditions.
To compare the fluxes the authors used data from the HET instrument
of the University of Chicago on IMP-8.
Comparison of proton fluxes at high latitudes and in the ecliptic
shows a 20% higher flux in polar regions. The flux increase is not
symmetric with respect to the heliographic equator but rather with
respect to a surface shifted by 7° south. In such a coordinate
system the latitudinal gradient in both hemispheres has a value of
(0.33 ± 0.02)%/deg in the area 30° to 55° S and
20° to 60° N.
For latitudes greater than 60° the gradient decreases. Also
the radial variation is small compared to the latitudinal variation.
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