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Ann. Geophys., 20, 1279-1289, 2002
www.ann-geophys.net/20/1279/2002/
© European Geosciences Union 2002
EISCAT measurements of solar wind velocity and the associated level of interplanetary scintillation
R. A. Fallows, P. J. S. Williams, and A. R. Breen
Physics Department, University of Wales, Aberystwyth, SY23 3BZ, Wales, UK
Correspondence to: R. A. Fallows (raf@aber.ac.uk)
Abstract. A relative scintillation
index can be derived from EISCAT observations of Interplanetary Scintillation (IPS)
usually used to study the solar wind velocity. This provides an ideal
opportunity to compare reliable measurements of the solar wind velocity derived
for a number of points along the line-of-sight with measurements of the overall
level of scintillation. By selecting those occasions where either slow- or
fast-stream scattering was dominant, it is shown that at distances from the Sun
greater than 30 RS , in both cases the scintillation index
fell with increasing distance as a simple power law, typically as R-1.7.
The level of scintillation for slow-stream scattering is found to be 2.3 times
the level for fast-stream scattering.
Key words. Interplanetary physics (solar wind plasma)
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