Articles | Volume 40, issue 6
https://doi.org/10.5194/angeo-40-641-2022
https://doi.org/10.5194/angeo-40-641-2022
Regular paper
 | 
09 Nov 2022
Regular paper |  | 09 Nov 2022

Impulse-driven oscillations of the near-Earth's magnetosphere

Hiroatsu Sato, Hans Pécseli, Jan Trulsen, Per Even Sandholt, and Charles Farrugia

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Subject: Magnetosphere & space plasma physics | Keywords: Planetary magnetospheres
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Cited articles

Abraham-Shrauner, B. and Yun, S. H.: Interplanetary shocks seen by Ames Plasma Probe on Pioneer 6 and 7, J. Geophys. Res., 81, 2097–2102, https://doi.org/10.1029/JA081i013p02097, 1976. a, b
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Archer, M. O., Horbury, T. S., Eastwood, J. P., Weygand, J. M., and Yeoman, T. K.: Magnetospheric response to magnetosheath pressure pulses: A low-pass filter effect, J. Geophys. Res.-Space, 118, 5454–5466, https://doi.org/10.1002/jgra.50519, 2013. a
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Short summary
An abrupt increase in pressure associated with interplanetary shocks will compress the Earth's magnetic field. This leads to a sudden impulse also observed in low-latitude magnetometer records. These events are followed by heavily damped oscillations of approximately 5 min periods, depending on plasma conditions. The general features are explained by a simple model. Our results are supported by satellite and ground-based observations. The results are also important for space–weather predictions.