Ulysses/KET Cosmic Ray Variability in Polar Coronal Hole Flow

Details Ulysses/KET Cosmic Ray Variability in Polar Coronal Hole Flow Ulysses/KET Cosmic Ray Variability in Polar Coronal Hole Flow

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh22a0745k&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH22A-0745

Physics

2102 Corotating Streams, 2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 7524 Magnetic Fields

Scientific paper

Large-scale solar wind structures such as corotating interaction regions (CIRs) are responsible for recurrent modulation of galactic cosmic rays. High latitude observations of >125 MeV protons by Ulysses/COSPIN/KET give indications that modulation on the basis of the solar rotation period is present at high heliographic latitudes. The fact that the observations were recorded at latitudes beyond the reach of CIRs points towards the field model with large-scale motion of magnetic field lines introduced by Fisk [1996]. The model predicts direct magnetic connections of field lines at high and low latitudes. We investigate the nature of cosmic ray modulation for the 1993/1994 Ulysses south polar pass by applying a 3-D field line mapping technique based on this field model. The results will be discussed.

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