Computer Science – Sound
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jatp...39..607w&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 39, May 1977, p. 607-617.
Computer Science
Sound
D Region, Ionospheric Electron Density, Ionospheric Sounding, Midlatitude Atmosphere, Illinois, Magnetic Effects, Magnetic Storms, Periodic Variations, Stratospheric Warming, Wave Reflection
Scientific paper
Electron density measurements made with the partial reflections technique above Urbana, Illinois (44 deg 10 min N, 88 deg 10 min W) were analyzed for day-to-day variations, seasonal variations, magnetic storm aftereffects, and stratosphere-ionosphere coupling effects. As well as showing a winter anomaly, the electron densities near 76 km were significantly lower in fall than in spring. Magnetic storm aftereffects of the type predicted by models of energetic electron precipitation at middle latitudes were observed. No strong correlations were found between stratospheric and D-region time series, or between the occurrence of stratospheric warmings and D-region changes. It is likely that most of the electron density variation was due to variations in the transport of minor neutral constituents. The spring-fall differences were also probably caused by differences in minor constituent concentrations rather than the effect of temperature changes on the recombination coefficient.
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