Simultaneous optical and incoherent scatter observations of two low-latitude auroras

Details Simultaneous optical and incoherent scatter observations of two low-latitude auroras Simultaneous optical and incoherent scatter observations of two low-latitude auroras

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..425n&link_type=abstract

Planetary and Space Science, vol. 24, May 1976, p. 425-442.

Computer Science

1

Auroras, F Region, Incoherent Scattering, Optical Measurement, Radar Measurement, Sunspots, Backscattering, Electron Impact, Electron Precipitation, Oxygen Spectra, Secondary Emission, Solar Activity Effects, Tropical Regions

Scientific paper

During the last sunspot maximum, major auroras occurred over Boston, Mass., during which optical and incoherent-scatter radar measurements were made simultaneously. The paper presents the results of these measurements and attempts a self-consistent interpretation of them. It is found that a major increase (5-10 times) in the abundance of molecular species (O2 and N2) at F-region heights must have occurred; this was not accompanied by any appreciable increase in the major neutral species, atomic oxygen. From the radar data, the energy input to the F-region can be separated into direct heating by secondary electrons, downward heat flow from the magnetosphere, and a low-energy nonionizing electron flux. The total observed intensity of the predominant optical emission from atomic oxygen at 6300 A can then be predicted satisfactorily by summing the contributions to this emission from impact excitation by ambient electrons, from the low-energy precipitating electrons, and from dissociative recombination.

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