Physics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23.1425t&link_type=abstract
Planetary and Space Science, vol. 23, Oct. 1975, p. 1425-1430.
Physics
1
Atmospheric Models, Helium Afterglow, Kp Index, Tropical Meteorology, Annual Variations, Atmospheric Ionization, Atmospheric Temperature, Brazil, Energy Dissipation, Ionospheric Electron Density, Thermosphere
Scientific paper
A further year's observation of twilight HeI 10830 A emission made in Brazil confirms the trend of seasonal variation found earlier. The 10830 intensities taken with concurrent ionosonde data are discussed in the context of recent model calculations of the emission rates. An increase with Kp is attributable to changing production and loss rates of 2(3)S He with changing thermospheric temperature. The morning intensities being greater than those of the evening can be due to several effects, an important one of which appears to be the much greater loss rate of photoelectron energy to ambient electrons in the evening, due to very high evening electron concentrations at the Appleton Anomaly ionization crests.
Angreji P. D.
Christensen Andrew B.
Sahai Yogeshwar
Teixeira N. R.
Tinsley Brian A.
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