Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30wssc6r&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 23, pp. SSC 6-1, CiteID 2207, DOI 10.1029/2003GL018253
Physics
6
Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Cycle Variations (7536), Interplanetary Physics: Solar Wind Plasma
Scientific paper
The character of the solar wind plasma data observed by Voyager 2 recently changed to a regime in which the speed, density and magnetic field magnitude are positively correlated. In the inner heliosphere, the density and speed are generally anti-correlated. As streams interact while propagating outward, this correlation weakens. Outside 65 AU, Voyager observed large, in-phase, fluctuations of speed, density, and magnetic field magnitude with time scales of 6-12 months. The dynamic pressure varies by a factor of ten in these fluctuations, which should produce motions in the termination shock. We use ACE data from 1 AU as input to a 1-D MHD model which includes pickup ions to model the radial evolution of the solar wind. The model reproduces the basic character (but not the details) of the observations, predicting correlated variations in speed, density, and magnetic field with time scales similar to those observed.
Burlaga Leonard Francis
Richardson John D.
Wang Chenjie
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