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- W2038854551 abstract "Abstract Observations of night-time E s occurrence from four stations near the southern auroral zone are analysed. A major peak in the diurnal curves for the percentage hourly occurrence of ƒ type E s is identified with the peak of occurrence of Auroral Belt type E s discussed by Penndorf and Coroniti for the northern auroral zone. It is found that the probable low lattitude extent of this peak is approximately 50 geomagnetic. A theory is proposed which attributes the occurrence of Auroral Belt type E s and Thule type E s to two separate processes, both of which involve the entry of electrons into the ionosphere under the control of the geomagnetic field. The theory shows that Auroral Belt type E s may be caused by electrons from a region of trapped particles the extent of which can be defined by the extent in geomagnetic latitude of the night-time peak in ƒ type E s occurrence. Thule type E s may be caused by an influx of electrons into the ionsphere from, a stream of particles approaching from the direction of the sun. The deflections of the peak of occurrence of ƒ type E s from the midnight magnetic meridian, and of the Thule type E s from the “geomagnetic noon” meridian, are a function of the mean energy of the electrons and the curvature and intensity of the lines of force in the geomagnetic field." @default.
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- W2038854551 date "1959-10-01" @default.
- W2038854551 modified "2023-09-25" @default.
- W2038854551 title "A theory of the origin and geomagnetic control of two types of high latitude ES" @default.
- W2038854551 doi "https://doi.org/10.1016/0032-0633(59)90059-5" @default.
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