Deducing spatial properties of auroral primary particle distributions from ground-based optical imaging

Details Deducing spatial properties of auroral primary particle distributions from ground-based optical imaging Deducing spatial properties of auroral primary particle distributions from ground-based optical imaging

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21a1885s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM21A-1885

Physics

[2407] Ionosphere / Auroral Ionosphere, [2455] Ionosphere / Particle Precipitation, [2494] Ionosphere / Instruments And Techniques, [2704] Magnetospheric Physics / Auroral Phenomena

Scientific paper

Height profiles and intensities of different auroral emissions depend on the properties of the primary particle distributions, but also on the composition of the upper atmosphere. Since ground-based imaging offers an opportunity to study the development of the aurora in a whole region of the sky and to resolve spatiotemporal ambiguities, it is highly desirable to be able to deduce properties of the primary particle distributions from optical data. So far, the most successful methods have relied on different emission intensity ratios, but these methods only work well for field-aligned measurements. This is obviously a severe limitation. In this paper we discuss ways to obtain information on primary particles away from magnetic zenith. We have used images of the auroral red and green line emissions obtained from two different ALIS stations to estimate the maximum deviation from magnetic zenith of the measurement direction for which the results are reliable. Taking into account that the altitude of the red line emission peak is about 100 km above the emission peak of the green line we find that the green to red intensity can be used to reconstruct auroral electron parameters for directions up to 30 degrees from magnetic zenith.

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