Imaging a geomagnetic storm with energetic neutral atoms |
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| Affiliation: | 1. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, USA;2. The Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723, USA;3. Goddard Planetary Heliophysics Institute, University of Maryland, Baltimore County, Baltimore, MD 22118, USA;4. Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;5. Space Telescope Science Institute, Baltimore, MD 21218, USA;6. Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA |
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| Abstract: | The ring current during a geomagnetic storm on May 2, 1986 has been modeled using a bounce averaged kinetic equations for the phase space density of hydrogen ions, considering charge exchange and Coulomb losses along the drift path. The resulting equatorial pitch angle distribution is used to generate data simulating the medium and high energy neutral atom imagers to be flown on IMAGE. A method for deconvolving these images is described and applied to the simulated data. The results show that, when there are sufficient counts, the deconvolved distribution contains the main features of the original source and that the energy spectrum at a specific time as well as the total energy of the ring current as a function of time can be extracted from the energetic neutral atom images. |
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