Night-time enhancements of ionospheric electron content at L = 4 during substorms

Details Night-time enhancements of ionospheric electron content at L = 4 during substorms Night-time enhancements of ionospheric electron content at L = 4 during substorms

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..815h&link_type=abstract

Geophysical Research Letters, vol. 8, July 1981, p. 815-818. Research supported by the Science Research Council of England

Mathematics

Probability

6

Ionospheric Electron Density, Ionospheric Propagation, Magnetic Storms, Nocturnal Variations, Radar Cross Sections, Auroras, Electron Density Profiles, Electron Precipitation, Magnetic Disturbances, Radiation Absorption, Synchronous Satellites

Scientific paper

Observations of the ATS-6 radio beacon from Fairbanks show structured enhancements of the night-time electron content during substorms. The probability of their occurrence increases with the level of magnetic disturbance, and they are most likely to be observed when the daily sum of K indices exceeds 20 in winter or 30 in summer. There is a remarkably close coincidence between these electron-content enhancements and auroral absorption events detected by a riometer, though the relative magnitudes vary with the time of day. Electron density profiles measured with the Chatanika incoherent-scatter radar confirm that the electron density at 90 km is enhanced during auroral absorption events. However, D and E-region ionization is insufficient to account for the observed enhancement of the electron content, and an F-region effect is a more likely cause. During one such event the F-region critical frequency was 8 MHz.

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