Meridional plasma flow in the outer heliosphere

Details Meridional plasma flow in the outer heliosphere Meridional plasma flow in the outer heliosphere

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1519l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Dec. 1988, p. 1519-1522.

Physics

19

Heliosphere, Magnetohydrodynamic Flow, Meridional Flow, Solar Wind, Space Plasmas, Autocorrelation, Current Sheets, Plasma Pressure, Solar Wind Velocity, Voyager 2 Spacecraft

Scientific paper

Voyager 2 observations made in the outer heliosphere near 25 AU and within 2° of the heliographic equatorial plane show periodic variations in the meridional (North/South) flow velocities that are much more prominent than the East/West variations. An autocorrelation analysis shows that the flow variation has an ≡25.5 day period in the latter half of 1986, in approximate agreement with the solar rotation period. The turning of the flow from northward to southward if often accompanied by abrupt increases in solar wind speed and pressure consistent with changes expected at forward shocks, suggesting origins of non-radial flow in stream dynamics.

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