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- W3125684917 abstract "[1] Several observational studies suggest that solar wind dynamic pressure fluctuations can drive magnetospheric ultralow-frequency (ULF) waves on the dayside. To investigate this causal relationship, we present results from Lyon-Fedder-Mobarry (LFM) global, three-dimensional magnetohydrodynamic (MHD) simulations of the solar wind–magnetosphere interaction. These simulations are driven with synthetic solar wind input conditions where idealized ULF dynamic pressure fluctuations are embedded in the upstream solar wind. In three of the simulations, a monochromatic, sinusoidal ULF oscillation is introduced into the solar wind dynamic pressure time series. In the fourth simulation, a continuum of ULF fluctuations over the 0–50 mHz frequency band is introduced into the solar wind dynamic pressure time series. In this numerical experiment, the idealized solar wind input conditions allow us to study only the effect of a fluctuating solar wind dynamic pressure, while holding all of the other solar wind driving parameters constant. We show that the monochromatic solar wind dynamic pressure fluctuations drive toroidal mode field line resonances (FLRs) on the dayside at locations where the upstream driving frequency matches a local field line eigenfrequency. In addition, we show that the continuum of upstream solar wind dynamic pressure fluctuations drives a continuous spectrum of toroidal mode FLRs on the dayside. The characteristics of the simulated FLRs agree well with FLR observations, including a phase reversal radially across a peak in wave power, a change in the sense of polarization across the noon meridian, and a net flux of energy into the ionosphere." @default.
- W3125684917 created "2021-02-01" @default.
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- W3125684917 creator A5091505012 @default.
- W3125684917 date "2010-11-01" @default.
- W3125684917 modified "2023-09-24" @default.
- W3125684917 title "Solar wind driving of magnetospheric ULF waves: Field line resonances driven by dynamic pressure fluctuations" @default.
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- W3125684917 doi "https://doi.org/10.1029/2010ja015399" @default.
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