A Statistical Model of Inner Magnetospheric Electron Density: Van Allen Probes Observations

Abstract

As an important part of the inner magnetosphere, the Earth's plasmasphere plays a very important role in the link of the occurrence and development of each space weather process. The Earth's plasmasphere is a torus-shaped cold (<10 eV) and dense (10 − 10 4 cm −3 ) plasma region of ionospheric origin corotating with the Earth (Lemaire and Gringauz, 1998). The plasmasphere contains several populations of particles such as electron, H + , He + , and O + ions (Sandel, 2011). The outer boundary of the plasmasphere is defined by a sharp gradient of density called the plasmapause, in which the density decreases by 1-2 orders of magnitude within 0.5 R E (the Earth radius) (Angerami & Carpenter, 1966;Carpenter & Anderson, 1992). It is also found that large scale plasmaspheric features including shoulders, plumes, notches, bulges and refiling, etc (

Global Empirical Models of Wave Amplitudes and Normal Angles of Banded Plasmaspheric Hiss Obtained From Van Allen Probes Observations

“…In this paper, we choose AE* (3-hr averaged AE) as one of the model parameters instead of plasma density. AE* reflects the levels of substorm activities, which have strong correlations with plasma densities and plasmapause positions (Lv et al, 2022;Ripoll et al, 2022Ripoll et al, , 2023. AE* can also significantly influence the amplitude of hiss waves (Agapitov et al, 2020;Meredith et al, 2004).…”