Geophys. Res. Lett., 22, 3321-3324, 1995
Abstract:
Between April and November 1994 the Ulysses spacecraft explored
heliographic latitudes above 60°S in the southern polar heliosphere and had
returned to 20°S by February 1995. We have used hourly averages of the
magnetic field measurements made by Ulysses to study the underlying
heliospheric field direction. In contrast to data previously reported from
lower latitudes, we find that above 60°S neither the mean nor the most
probable azimuthal angle of the magnetic field agree with that predicted by
the Parker model, the most probable angle being of the order of 24° more
tightly wound than expected. The distribution of azimuth angles retains the
high degree of asymmetry previously found at lower latitudes causing the
mean angle to remain slightly less tightly wound than the prediction. In
this high latitude region, the distribution of the meridional (north-south)
angle is found to be symmetric with mean and most probable values close to
the Parker prediction.
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