Optical evidence for mid-latitude charged particle precipitation

Details Optical evidence for mid-latitude charged particle precipitation Optical evidence for mid-latitude charged particle precipitation

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jatp...41..111c&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 41, Feb. 1979, p. 111-118. Research supported by the Radio Research Board

Physics

Electron Precipitation, Ionospheric Electron Density, Midlatitude Atmosphere, Atmospheric Chemistry, Atmospheric Ionization, E Region, Fabry-Perot Interferometers, Ionospheric Ion Density, Nitrogen Ions, Oxygen Ions, Recombination Coefficient

Scientific paper

Measurements of the N2(+) 427.8 nm emission from the atmosphere at a midlatitude station show intensities correlated with Kp, typical values being about 1R at Kp = 3 to 4. It is concluded that charged particle precipitation is a major cause of the emission. Assuming the particles to be electrons of typical auroral energies, they make a major contribution to the maintanance of the night-time E-region ionization. On one night the rotational temperature inferred from the N2(+) band shape was approximately 170 K, implying particle penetration to 80-90 km. Attempts to record H-beta emission from the atmosphere put an upper limit of 0.005 R on the intensity. It is concluded that proton precipitation is not a significant contributor to the E-region ionization.

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