Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transient Structures and Stream Interaction Regions in the 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 < 105 km to > 106 km was
characterized using one-minute time resolution observation of Interplanetary
Scintillation (IPS) made using the European Incoherent SCA Tter (EISCA T) radar
system. Simultaneously, the global structure and evolution of these features
was characterized 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 maybe 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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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat