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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 10
Ann. Geophys., 16, 1259–1264, 1998
https://doi.org/10.1007/s00585-998-1259-3
© European Geosciences Union 1998

Special issue: VIIIe EISCAT

Ann. Geophys., 16, 1259–1264, 1998
https://doi.org/10.1007/s00585-998-1259-3
© European Geosciences Union 1998

  31 Oct 1998

31 Oct 1998

Measurements of the direction of the solar wind using interplanetary scintillation

P. J. Moran1, A. R. Breen*,1, C. A. Varley1, P. J. S. Williams1, W. P. Wilkinson1, and J. Markkanen2 P. J. Moran et al.
  • 1Physics Department, University of Wales Aberystwyth, Penglais, Aberystwyth SY23 3BZ, UK
  • 2EISCAT Sodankylä , SF-99600, Finland
  • *Present address: Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany

Abstract. EISCAT observations of the interplanetary scintillation of a single source were made over an extended period of time, during which the orientation of the baselines between the two observing sites changed significantly. Assuming that maximum correlation between the scintillations observed at the two sites occurs when the projected baseline is parallel to the direction of plasma flow, this technique can be used to make a unique determination of the direction of the solar wind. In the past it has usually been assumed that the plasma flow is radial, but measurements of eleven sources using this technique have indicated conclusively that in at least six cases observed at mid or high heliocentric latitude there is a significant non-radial component directed in four cases towards the heliocentric equator and in two cases towards the pole.

Key words. Solar physics · Astrophysics · Astronomy · Magnetic fields · Space plasma physics · Charged particle motion and acceleration

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