Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..631b&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 6, p. 631-634
Physics
17
Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Mhd Waves And Turbulence, Interplanetary Physics: Sources Of The Solar Wind
Scientific paper
The heliospheric magnetic field over the poles of the sun has been examined to identify intervals when the polarity of the magnetic field deviates significantly from the calculated Parker spiral, using Ulysses observations in 1994 and 1995, near solar minimum. Intervals with deviation >90° have been identified, corresponding to magnetic field vectors pointing in the hemisphere opposite to that of the dominant polarity in the high speed solar wind originating in the polar coronal holes. The number of inversion periods decreases as the averaging period is increased from 1 to 12 hours. Their distribution was found to vary in time over the northern solar pole, where the average direction also deviated from the Parker direction. The propagation direction of waves during polarity inversions show that these are caused by large-scale folds in the magnetic field, rather than by opposite polarity magnetic flux tubes originating near the sun.
Balogh André
Forsyth Robert J.
Horbury Tim S.
Lucek Elisabeth A.
Smith Edward. J.
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