Other
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..653n&link_type=abstract
Planetary and Space Science, vol. 27, May 1979, p. 653-663.
Other
Atmospheric Composition, Ion Emission, Oxygen Ions, Thermosphere, Twilight Glow, Atmospheric Models, Geomagnetism, Hydroxyl Emission, Photoelectrons, Photoionization, Solar Activity Effects
Scientific paper
Measurements of the twilight enhancement of airglow emission from O+(2P) near 7325 A reveal major changes which accompany geomagnetic activity, no significant difference between evening and morning and an increase in brightness paralleling the approach to solar maximum. The principal source for O+(2P) is direct photoionization from O(3P) but at low solar activity there appears to be a contribution from another source in early twilight which may be local photoelectron ionization into O+(2P). The geomagnetic and solar effects appear to reflect changes in the O and N2 density in the thermosphere; ground based twilight measurements of O(+) emission thus provide a simple means for monitoring thermospheric structure from 300 km to 500 km at solar minimum and to 600 km at solar maximum.
Norton R. B.
Noxon John F.
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