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Optical Effects of the March 1970 Geophysical Event at the AFCRL Geopole Observatory, Thule Air Base, Greenland.
Environmental research papers,
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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The optical observations from Geopole Observatory, Thule A. B., Greenland, during the 6 to 10 March 1970 event are discussed. The spectral data were considered in detail for two periods, on March 6 and March 9, preceding and during the PCA. The ratio of the 5577A OI and 6300A OI emission intensities for several disturbed periods is found to be consistent with excitation somewhat below the normal F-region heights for production of 6300A OI. Use of optical and riometer data in conjunction indicates a hardening of the input energy spectrum on the 8th with a strong softening on the 9th, in accord with expectations from the moderate character of the PCA. A comparison of luminosity fluctuations at Qanaq and Geopole lead to movements of excitations with velocities of the order of 250 to 300 ms. Possible flare effects are noted and discussed. Author
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