An empirical dynamic equation for energetic electrons at geosynchronous orbit

Details An empirical dynamic equation for energetic electrons at geosynchronous orbit An empirical dynamic equation for energetic electrons at geosynchronous orbit

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1137o&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A3, pp. SMP 24-1, CiteID 1137, DOI 10.1029/2002JA009324

Physics

4

Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Numerical Modeling

Scientific paper

We develop an empirical dynamic equation for the hourly evolution of 1.8-3.5 MeV energetic electron flux at local noon at geosynchronous altitude. We use a genetic algorithm combined with a neural network to identify the magnetospheric quantities that can be used to model the time evolution of hourly energetic electron fluxes. We then apply a statistical technique to analyze how these quantities modify the evolution of energetic electron flux through phase space. We fit this evolution to an analytical dynamic equation. We show that the ring current index Dst and a Pc 5 ULF wave power index together can produce a meaningful model of the noon energetic electron flux. We also use this model to demonstrate how the magnetosphere would respond to a hypothetical increase in ULF wave power without a storm in Dst. We demonstrate that while the model electrons do respond to any enhancement in ULF wave power, their response is much larger in the presence of a magnetic storm with sustained ULF wave power.

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