Stream Interaction Regions at High Heliographic Latitudes During Ulysses12/22/2004 6:25PM Second Polar Orbit |
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Authors: | Gosling JT McComas DJ Skoug RM Forsyth RJ |
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Institution: | (1) Los Alamos National Laboratory, Los Alamos, New Mexico, U.S.A;(2) Southwest Research Institute, San Antonio, Texas, U.S.A;(3) Imperial College, London, U.K |
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Abstract: | Ulysses observed well-defined stream interaction regions, SIRs, associated with solar wind stream structure up to a latitude of S65°
and shocks to at least a latitude of S71° during the second polar orbit. These SIRs and shocks produced a substantial heliospheric
processing of the solar wind. Only a subset of the SIRs recurred on successive solar rotations and only about half of the
well-defined SIRs observed poleward of S9.8° were bounded by forward-reverse shock pairs. The majority of the SIRs had local
magnetic topologies and azimuthal orientations similar to, but meridional tilts different from, those observed in the first
polar orbit when most SIRs corotated with the Sun. The irregular meridional tilts presumably were a consequence of a complex
coronal geometry and the temporally evolving nature of the solar wind flow at this time. A lack of reverse shocks poleward
of S54° (with one exception) and a lack of well defined SIRs poleward of S65° is evidence that SIRs develop more slowly with
distance at high latitudes.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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