Estimating ULF wave equatorial electric fields from ground magnetic field measurements
Murray Sciffer
School of Mathematical and Physical Sciences. University of
Colin Waters
School of Mathematical and Physical Sciences. University of Newcastle Full text:
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Last modified: August 5, 2011
Abstract
Electrons in the radiation belts of the magnetosphere can be energized to relativistic energies (≥1 MeV) adversely affecting satellite operations in these regions. Estimates for the electric field in the equatorial region of the magnetosphere are important for calculating the maximum energy electrons gain from ultra low frequency (ULF) waves and for radiation belt loss studies. However, there are very few insitu measurements of ULF electric fields. Therefore, models of the ULF wave field are often used to infer the electric fields in the equatorial plane. In this presentation we will analyse results from a 2½ dimensional electromagnetic model which takes into account the ionospheric conductivities, geomagnetic dip angle and the ULF wave spatial structure. The model can compute the resulting magnetic perturbation fields at the ground and hence evaluate the ratio of the equatorial electric field and ground magnetic field. These modelling results will be compared to the previous results.
