Optical Effects of the March 1970 Geophysical Event at the AFCRL Geopole Observatory, Thule Air Base, Greenland.

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 intensi...

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Bibliographic Details
Main Authors: Silverman,S. M., Moore,J. G.
Other Authors: AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Format: Text
Language:English
Published: 1972
Subjects:
Atmospheric Physics
*IONOSPHERIC DISTURBANCES
*AURORAE
ULTRAVIOLET SPECTRA
OPTICAL PHENOMENA
LUMINESCENCE
POWER SPECTRA
POLAR REGIONS
SOLAR FLARES
GREENLAND
*POLAR CAP ABSORPTION
EMISSION SPECTRA
Greenland
Thule Air Base
Thule Air
Thule
Online Access:http://www.dtic.mil/docs/citations/AD0744074
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0744074
Description
Summary: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 m/s. Possible flare effects are noted and discussed. (Author)

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