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

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1058w&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A2, pp. SSH 1-1, CiteID 1058, DOI 10.1029/2002JA009322

Physics

11

Interplanetary Physics: Neutral Particles, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Interstellar Gas, Interplanetary Physics: Pickup Ions

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 observations from multiple spacecraft (ACE, Ulysses, and Voyager 2) near solar maximum with a multifluid one-dimensional numerical model to examine the solar wind slowdown. We find a decrease in speed of 53-62 km s-1 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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