Mathematics – Probability
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa22a0715s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA22A-0715
Mathematics
Probability
0310 Airglow And Aurora, 2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2494 Instruments And Techniques
Scientific paper
The O+(732nm) doublet in the aurora has long been the target of high-resolution spectroscopy because of its potential value as a tracer for F-region ion drift. It also presents a potential imaging diagnostic for soft particle precipitation, similar to O(630.0nm), but is rarely considered in this regard due to the overwhelming intensity of the N2(1P) band system in this wavelength regime. However, 732nm is superior to 630nm in that it has a much higher transition probability and, hence, can provide a more accurate and detailed image of the auroral source. The 732nm doublet also provides a direct image of O+ production in the aurora (at altitudes where quenching is minimal). This work presents the results of a multispectral imaging study to resolve high-resolution images of O+(732nm) in the discrete aurora. The key feature of the technique is the use of an N2+(1N) image as a proxy for the contribution from N2(1P) within the 732nm filter band. In cases where no E-region aurora was present, the discrete aurora at 732nm often appeared in <1km-wide patterns that were both narrower and more transient than the corresponding structures at 630~nm. Ionospheric effects recorded by the Sondrestrom IS radar revealed these features to be associated with long-lived, structured plasma enhancements. Thus, soft but structured precipitation patterns could have a significant impact on the distribution of conductivity at altitudes where Joule heating is important.
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