Changes in the heliosphere over the solar cycle

Details Changes in the heliosphere over the solar cycle Changes in the heliosphere over the solar cycle

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....11614s&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #11614

Physics

Scientific paper

There are significant changes in the large scale heliosphere over the solar cycle. During periods of minimum solar activity, most of the heliosphere is dominated by the uniformly high speed solar wind associated with large polar coronal holes. The higher dynamic pressure during this period inflates the heliosphere to its maximum size, and the lack of stream-driven turbulence above the steamer belt results in large diffusion mean free paths and significantly reduced modulation of galactic and anomalous cosmic rays. At maximum solar activity, stream interactions occur at all latitudes, resulting in increased turbulence and much smaller mean free paths. The solar wind dynamic pressure is at a minimum at solar maximum, as is the size of the heliosphere. Voyager 1 is now beyond 87 AU and in the vicinity of the termination shock where it will observe the recovery of the heliosphere as stream driven turbulence declines and solar wind pressure increases.

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