Relatively stable,large-amplitude Alfvénic waves seen at 2.5 and 5.0 AU |
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| Authors: | H Mavromichalaki X Moussas J J Quenby J F Valdes-Galicia E J Smith B T Thomas |
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| Institution: | (1) Nuclear and Particle Physics, Dept. of Physics, National University of Athens, 104, Solonos St, GR10680 Athens, Greece;(2) Astrophysics, Astronomy & Mechanics, Dept. of Physics, National University of Athens, Panepistimiopolis, GR15783, Athens, Greece;(3) The Blackett Laboratory, Imperial College, SW7 2BZ London, U.K.;(4) Instituto de Geofisica, UNAM, 04510 Mexico D.F., Mexico;(5) Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, 91109 Pasadena, CA, U.S.A.;(6) Dept. of Maths, Bristol University, BS8 1TW Bristol, Avon, U.K. |
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| Abstract: | Pioneer 11 and 10 observations of the wave structure seen in a corotating interaction region at 2.5 AU on day 284 of 1973 and 8 days later at 5 AU reveal large-amplitude Alfvénic structures with many detailed correlations seen between their features at the two radial distances. Hodogram analysis suggests the dominance of near plane polarized, transverse Alfvénic mode fluctuations with periods between 2 min and one hour or more. Some wave evolution close to the Corotating Interaction Region (CIR) shock is noticed, but waves towards the centre of the compression seem to propagate with little damping between the spacecraft observation positions. |
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