Henderson, M. G.,
Co-Authors: G D Reeves, R H W Friedel, S. Bourdarie, H E Spence, A M Jorgensen, J F Fennell, J Roeder, and J B Blake,
Title: Energetic Neutral Atom Images Derived from the 4D SALAMMBO Convection-Diffusion Code: Comparison with Polar CEPPAD/IPS ENA Images,
Reference: AGU Spring Meeting, Boston, MA, May 26-29, 1998.
Reference Type: Contributed Talk
CEPPAD: true
CAMMICE: false
RAPID: false
Abstract:
The CEPPAD/IPS instrument on Polar routinely images the ENA emissions generated in the near-Earth region of the magnetosphere where the density of cold exospheric neutral atoms is high. And, as expected, the images clearly show the spatial and temporal evolution of the enhanced ENA emissions associated with the buildup of the storm-time ring current. However, a somewhat unexpected result is that individual substorm injections are also routinely detected in the images. In this paper we utilize a four-dimensional convection-diffusion code (the SALAMMB\^{O}-4D code) to construct synthetic ENA images during simulated substorm injections and we compare these images to the Polar CEPPAD/IPS results. The SALAMMB\^{O} code solves for the electron and ion particle distribution functions described by a four-dimensional (energy, pitch-angle, L-shell, and MLT) Fokker-Planck convection-diffusion equation derived from adiabatic invariant theory. The code follows particles with energies from a few keV to several MeV, and substorms are simulated via impulsive increases in the convection electric field together with the injection of keV energy range particles in the midnight sector of the near-Earth tail.
