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Improving Empirical Magnetic Field Models by Fitting to In Situ Data Using an Optimized Parameter Approach

Brito, Thiago V.; Morley, Steven K.

A method for comparing and optimizing the accuracy of empirical magnetic field models using in situ magnetic field measurements is presented. The optimization method minimizes a cost function—τ—that explicitly includes both a magnitude and an angular term. A time span of 21 days, including periods of mild and intense geomagnetic activity, was used…

The substorm cycle as reproduced by global MHD models

Gordeev, E.; Sergeev, V.; Tsyganenko, N. +7 more

Recently, Gordeev et al. (2015) suggested a method to test global MHD models against statistical empirical data. They showed that four community-available global MHD models supported by the Community Coordinated Modeling Center (CCMC) produce a reasonable agreement with reality for those key parameters (the magnetospheric size, magnetic field, and…

Nowcasting and forecasting of the magnetopause and bow shock—A status update

Petrinec, S. M.; Rastaetter, L.; Redmon, R. J.

There has long been interest in knowing the shape and location of the Earth's magnetopause and of the standing fast-mode bow shock upstream of the Earth's magnetosphere. This quest for knowledge spans both the research and operations arenas. Pertinent to the latter, nowcasting and near-term forecasting are important for determining the extent to w…