Definition
- Electromagnetic Pulsations:
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Short period geomagnetic field fluctuations in the range of 0.2 to 600 s.
- Magnetic Storms:
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Large scale global disturbances in the geomagnetic field that last for about half a day to several days.
- Magnetospheric substorms:
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Magnetospheric disturbances, resulting from an enhanced coupling between the solar wind and the geomagnetic field, that follow a set pattern lasting for a period ~ half an hour to a few hours.
Electromagnetic Pulsations
Variations in the Earth’s magnetic field occur from hundreds of thousands of years to a fraction of a second. It is believed that the long period variations, from hundreds of thousands to tens of years, are caused by the geodynamo processes. On the other hand, the solar output is thought to drive, either directly or indirectly, the geomagnetic field variations at shorter periods varying from about 22 years to a fraction of a second. The geomagnetic field fluctuations at the shortest periods, ranging from about...
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Acknowledgments
GSL thanks Indian National Science Academy, New Delhi, for support under the INSA-Honorary Scientist Scheme.
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Lakhina, G.S., Tsurutani, B.T. (2021). Electromagnetic Pulsations and Magnetic Storms. In: Gupta, H.K. (eds) Encyclopedia of Solid Earth Geophysics. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-030-58631-7_156
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