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A. D. M. Walker; J. A. E. Stephenson (2014)
Publisher: Copernicus Publications
Journal: Annales Geophysicae
Languages: English
Types: Article
Subjects: Geophysics. Cosmic physics, Q, Science, Physics, QC1-999, QC801-809

Classified by OpenAIRE into

arxiv: Physics::Space Physics
A case study of a magnetohydrodynamic (MHD) wave in the solar wind that is strongly correlated with a magnetospheric field line resonance observed by the SuperDARN (Super Dual Auroral Radar Network) radar at Sanae, Antarctica is presented. The data from the ACE (Advanced Composition Explorer) satellite at the solar libration point are analysed. The data time series are bandpass filtered at the pulsation frequency and the analytic signal deduced. From these data the partition of energy between the field components is computed. It is shown that energy is equally partitioned between the kinetic energy and transverse magnetic potential energy densities. The energy flux vector is closely aligned with the background magnetic field. The transverse magnetic and velocity components are in antiphase. This is the first identification of the triggering wave as a transverse Alfvén wave which originates upstream from the space craft and is propagated to the magnetosphere to trigger the pulsation.
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    • Ghosh, S., Thomson, D. J., Matthaeus, W. H., and Lanzerotti, L. J.: Coexistence of turbulence and discrete modes in the solar wind, J. Geophys. Res., 114, A08106, doi:10.1029/2009JA014092, 2009.
    • Stephenson, J. A. E. and Walker, A. D. M.: HF radar observations of Pc5 ULF pulsations driven by the solar wind, Geophys. Res. Lett, 29, 1297, doi:10.1029/2001GL014291, 2002.
    • Stephenson, J. A. E. and Walker, A. D. M.: Coherence between radar observations of magnetospheric field line resonances and discrete oscillations in the solar wind, Ann. Geophys., 28, 47- 59, doi:10.5194/angeo-28-47-2010, 2010.
    • Thomson, D. J.: Spectrum Estimation and Harmonic Analysis, Proceedings of the IEEE, 70, 1055-1096, 1982.
    • Walker, A. D. M.: The SHARE radar at Sanae Antarctica, SAJ Science, 98, 257-263, 2002.
    • Walker, A. D. M.: Magnetohydromagnetic waves in Geospace, IOP Press, Bristol, 2005.
    • Walker, A. D. M.: Energy exchange and wave action conservation for MHD waves in a general slowly varying medium, Ann. Geophys., submitted, 2014.
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