Observations of galactic cosmic rays and the anomalous helium during ULYSSES passage from the south to the north solar pole.

Details Observations of galactic cosmic rays and the anomalous helium during ULYSSES passage from the south to the north solar pole. Observations of galactic cosmic rays and the anomalous helium during ULYSSES passage from the south to the north solar pole.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...316..547m&link_type=abstract

Astronomy and Astrophysics, v.316, p.547-554

Astronomy and Astrophysics

Astrophysics

21

Interplanetary Medium, Solar Wind, Cosmic Rays

Scientific paper

We compare observations of the modulated intensities and spectra of galactic cosmic ray nuclei and anomalous helium above 30 MeV/n measured by the COsmic and Solar Particle INvestigations (COSPIN) High Energy Telescope (HET) on Ulysses with similar observations from the IMP-8 earth-orbiting satellite between September 1994 and August 1995. During this interval Ulysses made a rapid scan of solar latitude from 80.22degS latitude to 80.22degN latitude at radial distances between 2.2 and 1.3 AU in a period of slowly decreasing solar modulation. The observations confirm our previous conclusions from measurements in the southern hemisphere that solar modulation is remarkably spherically symmetric in the inner heliosphere. Flux increased towards the poles by less than a factor of two for all species measured with no significant changes in the spectra of galactic cosmic ray nuclei and anomalous components. Fluxes over the north pole were in general slightly higher (~10-20%) than fluxes over the south pole. As reported by Simpson et al. (1996), the modulation was symmetrical about a surface at latitude 10degS. At the boundaries of the equatorial zone defined by low speed solar wind the solar wind speed increased by a factor of two within 5 degrees of latitude with no effect on the modulated cosmic ray and anomalous component spectra. This suggests that typical cosmic ray trajectories are not tightly confined in heliographic latitude and freely cross the boundary between the polar and equatorial zones during the modulation process. At the highest latitudes (>~50deg from the symmetry surface at ~10degS) latitudinal gradients in the cosmic ray intensity were significantly smaller than at lower latitudes.

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