Energetic neutral atom imaging at low altitudes from the Swedish microsatellite Astrid: Observations at low (<=10 keV) energies

Details Energetic neutral atom imaging at low altitudes from the Swedish microsatellite Astrid: Observations at low (<=10 keV) energies Energetic neutral atom imaging at low altitudes from the Swedish microsatellite Astrid: Observations at low (<=10 keV) energies

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10624663b&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A11, p. 24663-24674

Physics

6

Ionosphere: Polar Cap Ionosphere, Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Polar Cap Phenomena

Scientific paper

Intense (<=106cm-2sr-1s-1) fluxes of upflowing energetic neutral atoms (ENAs) from the polar cap have been observed in the energy range ~0.1-10 keV (hydrogen assumed) by the ENA imager PIPPI (Prelude In Planetary Particle Imaging) on board the Astrid satellite at 1000 km altitude. If a source altitude of 400 km is assumed, the ENA emissions maps to magnetic latitudes 70°-85° extending from dusk over nightside. There were no measurements in the midnight sector below approximately 80°. It is shown that the emissions cannot originate from an isotropically emitting source, which rules out any optical emissions. Local charged particle detection is ruled out on the basis of no correlation with local electron measurements and local magnetic field configuration. The ENA emissions can be explained by a conically pitch angle distributed ion source emitting ENAs in the 110°-140° pitch angle interval (source altitude 400 km). It is suggested, with support from low altitude rocket observations that the ENAs are produced by low altitude (400-600 km) ion conics of several hundreds eV charge exchanging with the upper atmosphere.

Affiliated with

Also associated with

No associations

Rating

Energetic neutral atom imaging at low altitudes from the Swedish microsatellite Astrid: Observations at low (<=10 keV) energies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Energetic neutral atom imaging at low altitudes from the Swedish microsatellite Astrid: Observations at low (<=10 keV) energies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energetic neutral atom imaging at low altitudes from the Swedish microsatellite Astrid: Observations at low (<=10 keV) energies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1554549