Energetic neutral atom imaging at low (<=10 keV) energies from Astrid: observations and simulations

Details Energetic neutral atom imaging at low (<=10 keV) energies from Astrid: observations and simulations Energetic neutral atom imaging at low (<=10 keV) energies from Astrid: observations and simulations

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..901b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 10, p. 901-909.

Physics

8

Scientific paper

Intense (106 cm-2 sr-1 s-1) fluxes of upflowing ENAs from the polar cap have been observed in the energy range 0.1-13 keV (hydrogen assumed) from the Astrid satellite at 1000 km altitude. If a source altitude of 400 km is assumed, the ENA emissions come from an arc-like region at magnetic latitudes 70-85° extending from dusk over to the nightside. Simulated images show that the observed emissions may be the ENA-albedo effect of the auroral ion precipitation. It is also possible that the observed emissions may originate from upward accelerated ions with cone-like pitch-angle distributions charge exchanging with the upper atmosphere.

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