A Radial Standing Pc5‐6 Wave and Its Energy Coupling With Field Line Resonance Within the Dusk‐Sector Magnetosphere

Abstract

Global ultra‐low frequency (ULF) oscillations are believed to play a significant role in the mass, energy, and momentum transport within the Earth's magnetosphere. In this letter, we observe a ∼1.2 mHz radial standing wave in the dusk‐sector magnetosphere accompanied by the field line resonance (FLR) on 16 July 2017. The frequency estimation from the simple box model also confirms the radial standing wave. The essential characteristics of FLR are concurrently identified at the dusk‐sector magnetosphere and the conjugated ground location. Further, the radial standing wave dissipates energy into upper atmosphere to enhance the local aurora by coupling itself to the FLR. The magnetospheric dominant 1.2/1.1 mHz ULF waves plausibly correspond well with the discrete ∼1 mHz magnetosheath ion dynamic pressure/velocity oscillation, suggesting this radial standing wave and FLR in the flank magnetosphere may be triggered by the solar‐wind and/or magnetosheath dynamic pressure/velocity fluctuations.

Spatial Evolution Characteristics of Plasmapause Surface Wave During a Geomagnetic Storm on 16 July 2017

“…Note that, the electric field component along the spin axis was calculated by reasonably assuming E − B = 0. ULF waves are usually analyzed in a field‐aligned (FA) coordinate system (He et al., 2020; Zhou et al., 2023) and a 45‐min moving‐average was used to define these background fields, which were subtracted to detrend the data. Normalized power spectra of perturbations were obtained via the FFT analysis.…”

Special Particle Precipitation Signatures Over Giant Auroral Undulations During the 7 September 2015 Geomagnetic Storm

“…Plasmapause disturbances are dominated by the rapid erosion and slow recovery during geomagnetic active period (e.g., Carpenter & Lemaire, 1997;Chu et al, 2017), lunar tide in the plasmasphere (Xiao et al, 2023), and plasmapause surface wave (PSW; e.g., He et al, 2020). These boundary dynamics would determine the whole magnetospheric configuration, thus shaping the rich morphology of main aurora oval, polar cap aurora, and detached subauroral arc via wave-particle interaction or heating (e.g., Nishimura et al, 2020;Pierrard et al, 2021;Qiu et al, 2022;Q.-H. Zhang et al, 2020Q.-H. Zhang et al, , 2021Zhou et al, 2023).…”