Determination of the solar wind slowdown near solar maximum

Details Determination of the solar wind slowdown near solar maximum Determination of the solar wind slowdown near solar maximum

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh22c..01w&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH22C-01

Physics

2144 Interstellar Gas, 2152 Pickup Ions, 2164 Solar Wind Plasma

Scientific paper

The magnitude of the solar wind speed decrease from the inner to the outer heliosphere provides important information about the interaction of the heliosphere with the local interstellar medium (LISM), leading to better estimates of the size and shape of the heliosphere and of the LISM density. In this study, we combine the observations from multiple spacecraft (ACE, Ulysses and Voyager 2) near solar maximum with a multi-fluid one-dimensional numerical model to examine the solar wind slowdown. We find a decrease in speed of 53-62 km~s-3 at Voyager 2 ( ~60 AU) with respect to ACE and Ulysses measurements, or a 12-14% slowdown, the largest yet reported. The model results agree well with observations if we assume an interstellar neutral hydrogen density of 0.09 cm-3 at the termination shock.

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