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- W2156815765 abstract "Using a global magnetohydrodynamic (MHD) simulation of the magnetosphere during a disturbed interval on 14 September 2004, we have investigated fluctuations in plasma properties of the magnetotail in the Pi2 range and their relationship to dipolarization fronts (DFs). Results from the MHD simulation indicate that this event is a very active interval with variable convection and disorder in the tail on a range of scales as small as ∼1 R E . DFs are observed in the simulation at the leading edge of fast earthward flows that originate from reconnection regions that form between ∼−15 and −30 R E in the tail. Pi2 period fluctuations are identified in pressure, magnetic field, and velocity components inside −13 R E following each burst of DFs in the midnight sector. The fluctuations observed in the pressure appear to be generated by the successive DFs as they approach the interface between stretched tail field lines and dipolar field lines. Fluctuations in the velocity may be the result of interactions between successive DFs and are amplified directly following the passage of the DFs as they propagate earthward. Although the limited azimuthal extent of the pulsations near the plasma sheet, just inside of the braking region, makes it difficult to draw a direct comparison between the ground‐based measurements and the pulsations at −6 R E , the temporal evolution of the simulated DFs and Pi2 pulsations approximately reproduces the timing of the variations observed by satellites and ground‐based instruments. Therefore, we have been able to use the global simulation to track the bursty flows, dipolarization fronts, and associated Pi2 period fluctuations throughout the entire magnetosphere in order to understand the sources of the changes measured in the near‐Earth region." @default.
- W2156815765 created "2016-06-24" @default.
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- W2156815765 date "2013-10-01" @default.
- W2156815765 modified "2023-10-14" @default.
- W2156815765 title "Generation of Pi2 pulsations by intermittent earthward propagating dipolarization fronts: An MHD case study" @default.
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- W2156815765 doi "https://doi.org/10.1002/2013ja018734" @default.
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