Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm22b01w&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM22B-01 INVITED
Other
2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling
Scientific paper
The LENA instrument on the IMAGE spacecraft measures low energy (10-300 eV) neutral atoms originating from, among other places, the auroral ionosphere. It produces six two-dimensional images (for three energy bins and two masses) at 8o angular resolution every two minutes. Images of the high latitude ionosphere made during IMAGE perigee passes indicate that the neutral flux levels, their dependence on magnetic activity, and their altitude of peak production (below 1500 km) are in rough accord with preflight estimates. However, to no ones surprise, details of the images do not conform to expectations. Principle among these discrepancies is the lack of a clearly defined auroral oval in the images. To properly interpret the images we have redone much of our previous analysis. This includes the use of an improved empirical ion outflow model that has been adjusted to be consistent with the results of the numerous statistical studies of outflow data. In addition we have added to the calculations, processes that specifically effect the transport of low energy neutrals originating at low altitudes, namely, collisions, gravitational deflection, and ram deflection. These latter effects seem to be key to properly understanding the LENA perigee images.
Collier Mark
Moore Thomas Earle
Wilson Gordon Ray
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