Abstract

THE purpose of this communication is to show that the southern edge of the auroral belt (the latitudinal range over which aurorae occur at a given time and longitude) can be reliably tracked by radio means. With the multi-frequency high-frequency system used at College, Alaska, the auroral belt can be tracked from overhead at 65° to above 80° north latitude. This wide coverage is possible because the high-frequency system utilizes ordinary ionospheric reflexion to extend the northern limit of detection, and normal E and F layer refraction to produce perpendicularity between the wave and the geomagnetic field. The very-high-frequency auroral radar, on the other hand, can detect only those aurorally associated scatterers located in the E layer near the relatively limited region where the line of sight is normal to the geomagnetic field.

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