Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....14020s&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #14020
Computer Science
Scientific paper
In the last 16 months, during the declining phase in solar activity, Ulysses descended from the north polar cap to 15^o latitude. Observations in the polar cap revealed that the polar coronal hole had reemerged along with the fast high latitude wind seen previously near solar maximum. The polarity of the polar cap magnetic field had reversed and was now inward. The strength of the polar cap field in the photosphere has been inferred from Ulysses measurements of the open flux, r2 Br, and the solar wind speed in the fast polar coronal hole flow. Estimates are obtained every solar rotation and reveal a gradual increase from 5 to 10 gauss. These estimates, derived solely from solar wind measurements, can be compared with those obtained once a year by Earth-based magnetographs throughout the solar cycle. The Ulysses data reveal the sector structure of the Heliospheric Magnetic Field between high and low latitudes. The crossing of the Heliospheric Current sheet was first observed near 50^o N latitude and was seen on subsequent solar rotations as the latitude decreased. The latitude- longitude structure of the HCS compares favorably with the Neutral Line derived from potential field source surface models.
Balogh André
McComas David John
Murphy Neil
Smith Edward. J.
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