Quantifying the Role Of Non-Adiabatic Processes In The Creation Of The Outer Radiation Belts

Physics

Scientific paper

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2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

We have recently reported (Fox et al., 2005) strong evidence supporting suggestions that non-adiabatic (first invariant breaking) processes are required to explain the generation of Earth's outer electron radiation belt during intense storm events and also during more typical outer belt conditions. This evidence relies on the most conservative of assumptions that maximize the phase space densities of particle distributions displaced in our models from the source population within the near-Earth magnetotail to the inner magnetospheric regions. With the finding that the phase space densities of measured outer belt electron distributions exceed the phase space densities of these maximized source population distributions, we established qualitatively that non-adiabatic processes are required. The purpose of our follow-on studies is to establish the quantitative levels of the contributions of the non-adiabatic processes to the energization of the outer belt electrons. Here we bound these contributions by generalizing our transport calculations from the consideration of only first adiabatic constraints to the consideration of first and secondary adiabatic invariant constraints, electron scattering, and electron losses. The energies that electrons can acquire via radial transport under these new constraints are determined using data from ISEE and CRRES, and samples of spectra are examined at various L-values to identify the deficiencies in phase space density. Fox, N. J., B. H. Mauk, and J. B. Blake, Establishing the role of non-adiabatic processes in the creation of the Earth's outer electron radiation belt, Geophys. Res. Lett., submitted, 2005.

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