Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh43a..11v&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SH43A-11
Physics
2149 Mhd Waves And Turbulence, 2164 Solar Wind Plasma, 7843 Numerical Simulation Studies
Scientific paper
High latitude observations of the magnetic field by the Ulysses spacecraft have shown a significance number of cases where the radial magnetic field polarity is reversed with respect to the dominant polarity of the coronal hole from which the wind emanates. Such reversals have the nature of folded back magnetic field lines. It has been suggested that such reversals are due to reconnection of closed and open field lines in the lower corona which would launch a large amplitude Alfvén wave into the solar wind. We suggested an alternative mechanism for the generation of the polarity reversal, namely, the coupling of standard large amplitude Alfvénic turbulence in the low frequency regime propagating away from the sun with the microstream shears observed in the high speed solar wind. Here we show that pressure and density signals are similiar to those observed in the data, and discuss the correlation of the reversals with the high latitude microstream structure.
Hellinger Petr
Landi Simone
Velli M. M.
Winterhalter Daniel
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