Equatorwards expansion of unperturbed, high-latitude fast solar wind

Dorrian, Gareth and Breen, Andy and Fallows, Richard and Bisi, Mario (2013) Equatorwards expansion of unperturbed, high-latitude fast solar wind. Solar Physics, 285 (1-2). pp. 97-110. ISSN 0038-0938

Abstract

We use dual-site radio observations of interplanetary scintillation (IPS) with ex- tremely long baselines (ELB) to examine meridional flow characteristics of the ambient fast solar wind at plane-of-sky heliocentric distances of 24–85 solar radii (R⊙). Our results demonstrate an equatorwards deviation of 3 – 4◦ in the bulk fast solar wind flow direction over both northern and southern solar hemispheres during different times in the declining phase of Solar Cycle 23.