Mathematics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..213e&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, March 1986, p. 213-220.
Mathematics
3
Airglow, Data Processing, E Region, Oxygen Ions, Satellite Observation, Annual Variations, Data Bases, Emission Spectra, Functions (Mathematics), Geomagnetic Latitude, Isis-B, Signal To Noise Ratios, Temporal Distribution
Scientific paper
A method to determine whether a two-dimensional data set can be represented by two independent separable functions is demonstrated using both synthetic data and satellite observations of OI 5577 A airglow. For such cases when the functions are separable it is possible to identify the function in the presence of noise using an iterative procedure based on the properties of an equitable matrix. In the specific case of the airglow, the latitudinal and temporal variations are separable for the data set studied. The spatial structure shows a minimum near the equator, with maxima at 35 deg in the winter hemisphere and 25 deg in the summer hemisphere. The long-term temporal function shows maxima after the equinoxes, with minima near the solstice. A 12 month component has a maximum near day 300.
Cogger Leroy L.
Elphinstone R.
Murphree John S.
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