Geophys. Res. Lett, 27, 625 - 628, 2000
Abstract:
Ulysses encountered two separate sequences of corotating interacting
regions (CIRs) in 1992-3 and 1996-7 when the spacecraft was in the
southeren and northen solar hemispheres, respectively. We have
examined magnetometer data from one event observed in each
hemisphere. Using two separate analytical methods we provide evidence
for the magnetic field vector within these CIRs being strongly
confined to a series of near-parallel planes. The distribution of the
field within the interaction region is characteristic of that
observed in planar magnetic structures. This planar order is evident
over both small (3-hours) and large (whole event) scales. The CIRs
display opposed north-south tilts that are consistent with previous
authors' analysis of solar wind plasma data. These results are in
direct agreement with the tilted dipole model of three-dimensional
corotating stream interactions.
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