Solar wind propagation from Ulysses to Voyager 2

Details Solar wind propagation from Ulysses to Voyager 2 Solar wind propagation from Ulysses to Voyager 2

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh52a..01r&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH52A-01

Physics

2126 Heliosphere/Interstellar Medium Interactions, 2139 Interplanetary Shocks, 2144 Interstellar Gas, 2164 Solar Wind Plasma

Scientific paper

Ulysses near 5 AU and Voyager 2 near 80 AU were at the same heliolatitude in mid-2005. This alignment provides an opportunity to study the propagation of the solar wind through the heliosphere. Voyager 2 saw a large shock at roughly the time the solar wind from the alignment time was expected to arrive at Voyager 2 from Ulysses. We model two possible sources of this shock, fast streams from polar coronal holes and coronal mass ejections (CMEs), and obtain a reasonable match to the V2 data by combining these sources. We also investigate the slowdown of the solar wind due to pickup ions over this distance. The modeling of the shock allows us to remove the period when transient plasma from CMEs is important and determine that the solar wind speed decreases about 70 km/s due to pickup ions, consistent with a interstellar hydrogen density at the termination shock of about 0.09/cc.

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