Observations by the Viking and Cluster satellites at altitudes up to 35 000 km show that Lower Hybrid Cavities (LHCs) are common in the inner magnetosphere. LHCs are density depletions filled with waves in the lower hybrid frequency range. The LHCs have, until recently, only been found at altitudes up to 2000 km. Statistics of the locations and general shape of the LHCs is performed to obtain a...

The plasmaspheric mass density at was monitored by two IGPP/LANL ground magnetometer stations during the magnetic storm on September 25, 1998. Even at this low latitude the plasma density dropped significantly to of the pre-storm value. The total electron content (TEC) inferred by GPS signals also shows a sizable decrease during the storm. The observations suggest that the convection caused by ...

Abstract The preliminary impulse of the sudden commencement is simply explained by generation compressional wave due to compression dayside magnetopause and mode conversion from Alfvén in magnetosphere. However, this simple model cannot explain a time delay peak displacement longer duration higher latitudes pre-noon post-noon sectors polar region. Based on global magnetohydrodynamic simulation ...

This study reports the temporal and spatial distributions of extremely/very low frequency (ELF/VLF) wave activities energetic electron fluxes in ionosphere during an intense storm (geomagnetic activity index Dst approximately −174 nT) that occurred on 26 August 2018, based observations by a set detectors onboard China Seismo-Electromagnetic Satellite (CSES). A good correlation ionospheric ELF/V...

[1] Observations of the electron density ne based on measurement of the upper hybrid resonance frequency by the Polar spacecraft Plasma Wave Instrument (PWI) are available for March 1996 to September 1997, during which time the Polar orbit sampled all MLT values three times. In a previous study, we modeled the electron density dependence along field lines as ne = ne0(Rmax/R) , where ne0 is the ...