Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 29, Issue 22, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2002GL015164
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Observations of the magnetic field orientation in co-rotating rarefaction regions (CRRs) reveals that the field can be significantly more radial than predicted by the Parker model. In particular, CRRs sampled by the Ulysses spacecraft beyond 4 AU from the sun often show average field orientations deviating by more than 30degrees from the expected Archimedian spiral and lasting many days. These observations are explained by a model combining footpoint motion between fast and slow solar wind streams at the source surface with the effects of velocity shear across coronal hole boundaries.
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