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Multiscale Processes in the Earth’s Magnetosphere: From Interball to Cluster pp 95–110Cite as

Pressure Pulses and Cavity Mode Resonances

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Part of the book series: NATO Science Series II: Mathematics, Physics and Chemistry ((NAII,volume 178))

Abstract

Theory predicts that abrupt variations in the solar wind dynamic pressure trigger widespread compressional cavity mode resonances within the magnetosphere. We inspect solar wind and magnetospheric observations at the times of previously reported events seen in ground magnetograms. We find evidence for abrupt solar wind pressure variations in the form of direct observations of solar wind dynamic pressure, motion of the bow shock, or fluctuations in the location of the foreshock. We also find evidence for widespread compressions of the magnetospheric magnetic field in observations by geosynchronous spacecraft. However, in contrast to the predictions of the model for an abrupt increase in wave activity followed by a gradual decay, we find that the periodicity seen in previously reported events occurs primarily in response to repeated impulsive excitations. If cavity mode resonances are present, they dissipate very rapidly within two cycles.

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Authors and Affiliations

  1. NASA Goddard Space Flight Center, Greenbelt, MD, 20771

    David G. Sibeck

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  1. David G. Sibeck
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Editors and Affiliations

  1. Centre ďEtude Spatiale des Rayonnements Centre National de la Recherche Scientifique, Université Paul Sabatier, Toulouse, France

    Jean-André Sauvaud

  2. Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic

    Zdeněk Němeček

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© 2005 Springer Science + Business Media, Inc.

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Sibeck, D.G. (2005). Pressure Pulses and Cavity Mode Resonances. In: Sauvaud, JA., Němeček, Z. (eds) Multiscale Processes in the Earth’s Magnetosphere: From Interball to Cluster. NATO Science Series II: Mathematics, Physics and Chemistry, vol 178. Springer, Dordrecht. https://doi.org/10.1007/1-4020-2768-0_6

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