The evaluation of time-varying parameters pertinent to the excitation of O(1S) in aurora

Details The evaluation of time-varying parameters pertinent to the excitation of O(1S) in aurora The evaluation of time-varying parameters pertinent to the excitation of O(1S) in aurora

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..161p&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 38, Jan. 1990, p. 161-172. Research supported by NSERC.

Physics

4

Atomic Excitations, Auroras, Oxygen Atoms, Concentration (Composition), Electron Transitions, Energy Transfer, Photometry, Sky Brightness

Scientific paper

Photometric measurements during aurora of the time-varying, integrated, surface brightness emitted by the (OI32) transition of atomic oxygen and the B2Sigma(+)g - X2Sigma(+)g transitions of the First Negative system of N2(+) provide observational information pertinent to the excitation mechanisms of the O(1S) state in the upper atmosphere. A four-coefficient autoregressive exogeneous process, based on a combination of direct and indirect electron excitation, is used to model the observational data and to fix the pertinent physical parameters (two excitation rates and two time constants) using a time-domain, recursive, instrumental-variables algorithm. The method has been applied to real auroral photometric data, and the parameters thus determined compare favorably with those evaluated by means of a nonrecursive cross-spectral technique. A modification to the algorithm allows the tracking of changes in the excitation mechanism by evaluating parameters which vary in time.

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