Interplanetary shocks close to the Sun: Helios 1 and 2 observations

Details Interplanetary shocks close to the Sun: Helios 1 and 2 observations Interplanetary shocks close to the Sun: Helios 1 and 2 observations

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh31a1448l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH31A-1448

Physics

Plasma Physics

[7851] Space Plasma Physics / Shock Waves

Scientific paper

Recent studies of shock formation in the solar wind indicate that nearly all shocks associated with stream interactions form between Venus and Earth or beyond. This agrees with an earlier study of PVO data that indicated that most shocks seen at 0.72 AU were generated by ICMEs. In this study, we examine the high-resolution magnetometer records from Helios 1 and 2 data obtained between 0.3 and 1 AU to gain further insight as to where, and in what context, shocks are formed in the inner solar system. We find there were only a few shocks observed inside the Venus orbit with the closest shock to the Sun at 0.44 AU; there is a strong correlation between shock occurrence and solar activity as measured by the sunspot number. Most of the shocks inside of the Venus orbit appear to be associated with ICMEs. Even the ICME-associated shocks are quite weak inside the Venus orbit.

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