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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Cited articles

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Araki, T.: A physical model of the geomagnetic sudden commencement, in: Solar Wind Sources of Magnetospheric Ultra-Low-Frequency Waves, Vol. 81, Geophysical Monograph, The American Geophysical Union, Washington, DC, 183–200, ISBN: 0875900402, 1994. a, b, c, d, e, f, g
Araki, T., Fujitani, S., Emoto, M., Yumoto, K., Shiokawa, K., Ichinose, T., Luehr, H., Orr, D., Milling, D. K., Singer, H., Rostoker, G., Tsunomura, S., Yamada, Y., and Liu, C. F.: Anomalous sudden commencement on March 24, 1991, J. Geophys. Res.-Space, 102, 14075–14086, https://doi.org/10.1029/96JA03637, 1997. a, b, c
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.