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- W1549598753 abstract "Sudden Impulses (SI) are rapid variations of the magnetospheric and geomagnetic field which are usually related to the Earth’s arrival of sudden increases in the dynamic pressure of the solar wind (SW), generally associated with interplanetary shock waves or discontinuities. Such impulses often precede geomagnetic storms: in this case they are referred as Storm Sudden Commencements (SSC). Incoming SW pressure pulses compress the magnetosphere, increase the magnetopause and tail currents, and possibly other magnetospheric/ionospheric current systems as well; correspondingly, the magnetospheric and ground fields generally increase to a new state over about a two to fifteen minute period. The field variation associated to SI mostly occurs along the north/south component (Bz in the magnetosphere, H in the geomagnetic field). Additional contributions also come from the effects of the tail current (mostly in the nightside sector) and from those of the ring current (during more active magnetospheric conditions). The further development of field aligned currents (FAC) and ionospheric currents typically makes the SI manifestation at ground much more complex than in the magnetosphere: on the other hand, since earliest investigations (Matsushita, 1962; Nishida and Jacobs, 1962), it is well known that different transient waveforms are detected at different ground stations. Given their global simultaneous occurrence and clear onset time, SI provide a good opportunity for understanding the transient response of the magnetosphere and ionosphere to the SW variations." @default.
- W1549598753 created "2016-06-24" @default.
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- W1549598753 date "2012-03-21" @default.
- W1549598753 modified "2023-10-02" @default.
- W1549598753 title "Sudden Impulses in the Magnetosphere and at Ground" @default.
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- W1549598753 doi "https://doi.org/10.5772/36770" @default.
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