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Microstructure of the IMF turbulences at 2.5 AUA detailed analysis of small period (15-900 sec) magnetohydrodynamic (MHD) turbulences of the interplanetary magnetic field (IMF) has been made using Pioneer-11 high time resolution data (0.75 sec) inside a Corotating Interaction Region (CIR) at a heliocentric distance of 2.5 AU in 1973. The methods used are the hodogram analysis, the minimum variance matrix analysis and the cohenrence analysis. The minimum variance analysis gives evidence of linear polarized wave modes. Coherence analysis has shown that the field fluctuations are dominated by the magnetosonic fast modes with periods 15 sec to 15 min. However, it is also shown that some small amplitude Alfven waves are present in the trailing edge of this region with characteristic periods (15-200 sec). The observed wave modes are locally generated and possibly attributed to the scattering of Alfven waves energy into random magnetosonic waves.
Document ID
19950052994
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mavromichalaki, H.
(Athens Univ. Athens, Greece)
Vassilaki, A.
(Athens Univ. Athens, Greece)
Marmatsouri, L.
(Athens Univ. Athens, Greece)
Moussas, X.
(Athens Univ. Athens, Greece)
Quenby, J. J.
(Imperial College London, UK, United States)
Smith, E. J.
(Jet Propulsion Lab. California Inst. of Tech., Pasadena, CA, US, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1995
Publication Information
Publication: Advances in Space Research
Volume: 16
Issue: 9
ISSN: 0273-1177
Subject Category
Solar Physics
Accession Number
95A84593
Distribution Limits
Public
Copyright
Other

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