Statistics – Computation
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm72a..01r&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM72A-01
Statistics
Computation
2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 7837 Neutral Particles (2151)
Scientific paper
Low altitude energetic neutral atom emission (LAE) is produced when precipitating magnetospheric ions (mainly H+) undergo charge-exchange collisions with exospheric monatomic oxygen atoms (O) at altitudes below 500 km. LAE has been previously observed by ENA cameras on several spacecraft (Astrid/PIPPI, IMAGE/MENA, and IMAGE/HENA). Recent comparisons of observations of LAE in ENA images from TWINS with simultaneous in situ DMSP measurements of precipitating ions are presented in related papers in this Special Session [ Bazell et al.; McComas et al.]. LAE is strongly directional, and so is observable by the TWINS spacecraft when either spacecraft is at moderate to high geomagnetic latitudes and precipitation is occurring at MLT about 12h around from the location of the TWINS spacecraft. LAE is a "thick-target" process involving many collisions with charge exchange of H+, stripping of neutral H, as well as energy losses due to ionization and excitation of the O when the energetic hydrogen is in either its charged (H+) or neutral (H) state. Two coupled transport equations for the ion and ENA intensities are developed in the extreme forward-scattering approximation (which does, however, include an energy loss in every kind of collision). Pitch-angle changes in the Earth's magnetic field are also included, because they profoundly influence the emerging intensities of both ENAs and ions. Analytic solutions for these intensities have been obtained, and they are applied to obtain a simplified relation between the precipitating ion intensity and the emergent ENA and ion intensities. Details of the computations are presented in a related poster in this Special Session [ Nair and Roelof].
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