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Ann. Geophys., 18, 995-1002, 2000
www.ann-geophys.net/18/995/2000/
© European Geosciences Union 2000
Simultaneous interplanetary scintillation and optical measurements of the acceleration of the slow solar wind
A. R. Breen1, S. J. Tappin2, C. A. Jordan3, P. Thomasson3, P. J. Moran1, R. A. Fallows1, A. Canals1, and P. J. S. Williams1
1University of Wales, Aberystwyth, Ceredigion SY23 3BZ, Wales, UK
2University of Birmingham, Edgbaston, Birmingham, UK
3The University of Manchaster, Jodrell Bank Observatory, Cheshire, UK
Correspondence to: A. R. Breen
e-mail:azb@aber.ac.uk
Abstract. Simultaneous observations of the slow solar
wind off the southeast limb of the Sun were made in May 1999 using optical
measurements from the C2 and C3 LASCO coronagraphs on board the SOHO spacecraft
and radio-scattering measurements from the MERLIN and EISCAT facilities. The
observations show the slow solar wind accelerating outwards from 4.5 solar radii
(R), reaching a final velocity of 200-300 km s-1 by 25-30 R. The
acceleration profile indicated by these results is more gentle than the average
profile seen in earlier LASCO observations of larger scale features, but is
within the variation seen in these studies.
Key words: Interplanetary physics (solar wind plasma;
sources of the solar wind; instruments and techniques)
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