Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh53a1479j&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH53A-1479
Physics
2101 Coronal Mass Ejections (7513), 2139 Interplanetary Shocks, 2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma
Scientific paper
Pioneer Venus Orbiter (PVO) solar wind measurements at 0.7 AU from 1979-1987 and Wind and ACE measurements at 1.0 AU from 1995-2004 have been used to study the structures of stream interaction regions (SIRs) and interplanetary coronal mass ejections (ICMEs). The occurrence rate of SIRs changes only slightly during the solar cycle and is similar at the two radial distances. From 0.7 to 1 AU, average scale size of SIRs decreases, and the overall transition in the parameters across the SIR steepens, while the shock association rate increases significantly (from very seldom to about 25%). In contrast to SIRs, the occurrence rate of ICMEs follows solar activity. The average scale size of ICMEs increases with distance, while the fraction of magnetic clouds decreases. These suggest that the ICMEs may disturb a greater angular extent at 1 AU than at 0.7 AU. Shock association rate also increases from 0.7 to 1.0 AU. We note that some of the differences may be due to the use of two different solar cycles at the two heliocentric distances.
Jian Li
Luhmann Janet G.
Russell Christopher T.
Skoug Ruth M.
Steinberg John T.
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