This project has demonstrated that one class of magnetic pulsations known as stormtime Pc 5 waves is correlated with substorm onsets. Stormtime Pc 5 waves observed by geostationary satellites in the afternoon sector is characterized by oscillations of magnetic field with a period from 2 to 10 minutes, easily detected by magnetometers on communication or weather satellites. The estimated substorm onset times are found to be within 20 minutes of ...
A simple adiabatic theory of particle modulations is derived. Assuming that the perturbed magnetic field is time dependent but homogenous in space along the dipole direction, an expression for the change of particle fluxes in the equatorial plane is derived in terms of measurable quantities. We show here that the derived expression agrees well with observed characteristics of trapped electron fluxes measured by the University of Minnesota electron spectrometer on ...
Physical properties of electron variations of period in the range 2 - 12 minutes detected in the afternoon magnetosphere at synchronous altitudes by the University of Minnesota electron spectrometer on the ATS-1 are presented. We find that in the energy interval 50 keV to 1 meV, most of the electron variations are correlated with the intensity of the local magnetic field. This correlation exists down to a few minutes time ...
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