Dynamic Cusp At Low Altitudes: A Case Study Utilizing Viking, DMSP-F7, andSondrestrom Incoherent Scatter Radar Observations

摘要

Coincident multi-instrument magnetospheric and ionospheric observations have madeit possible to determine the position of the ionospheric footprint of the magnetospheric cusp and to monitor its evolution over time. The data used include charged particle and magnetic field measurements from the Earth-orbiting Viking and DMSP-F7 satellites, electric field measurements from Viking, interplanetary magnetic field and plasma data from IMP-8 and Sondrestrom incoherent scatter radar observations of the ionospheric plasma density, temperature, and convection. Viking detected cusp precipitation poleward of 75.5 degrees invariant latitude. The ionospheric response to the observed electron precipitation was simulated using an auroral model. It predicts enhanced plasma density and