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Transient Structures and Stream Interaction Regions inthe Solar Wind: Results from EISCAT Interplanetary Scintillation, STEREO HI and Venus Express ASPERA-4 Measurements

We discuss the detection and evolution of a complex series of transient and quasi-static solar-wind structures in the days following the well-known comet 2P/Encke tail disconnection event in April 2007. The evolution of transient solar-wind structures ranging in size from 10 super(6) km was characte...

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Published in:Solar physics 2010-08, Vol.265 (1-2), p.207-231
Main Authors: Dorrian, G D, Breen, A R, Davies, JA, Rouillard, A P, Fallows, R A, Whittaker, I C, Brown, D S, Harrison, R A, Davis, C J, Grande, M
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container_issue 1-2
container_start_page 207
container_title Solar physics
container_volume 265
creator Dorrian, G D
Breen, A R
Davies, JA
Rouillard, A P
Fallows, R A
Whittaker, I C
Brown, D S
Harrison, R A
Davis, C J
Grande, M
description We discuss the detection and evolution of a complex series of transient and quasi-static solar-wind structures in the days following the well-known comet 2P/Encke tail disconnection event in April 2007. The evolution of transient solar-wind structures ranging in size from 10 super(6) km was characterised using one-minute time resolution observation of Interplanetary Scintillation (IPS) made using the European Incoherent SCATter (EISCAT) radar system. Simultaneously, the global structure and evolution of these features was characterised by the Heliospheric Imagers (HI) on the Solar TERrestrial RElations Observatory (STEREO) spacecraft, placing the IPS observations in context. Of particular interest was the observation of one transient in the slow wind, apparently being swept up and entrained by a Stream Interaction Region (SIR). The SIR itself was later detected in-situ at Venus by the Analyser of Space Plasma and Energetic Atoms (ASPERA-4) instrument on the Venus Express (VEX) spacecraft. The availability of such diverse data sources over a range of different time resolutions enables us to develop a global picture of these complex events that would not have been possible if these instruments were used in isolation. We suggest that the range of solar-wind transients discussed here may be the interplanetary counterparts of transient structures previously reported from coronagraph observations and are likely to correspond to transient magnetic structures reported in in-situ measurements in interplanetary space. The results reported here also provide the first indication of heliocentric distances at which transients become entrained.
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subjects Entrainment
Evolution
Scintillation
Solar physics
Space plasmas
Spacecraft
Streams
Venus
title Transient Structures and Stream Interaction Regions inthe Solar Wind: Results from EISCAT Interplanetary Scintillation, STEREO HI and Venus Express ASPERA-4 Measurements
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