Abstract
A close relation between Ionospheric absorption of cosmic radio noise and chorus intensity at the auroral zone is found for diurnal variations of them on geomagnetically 5 quiet days, those on geomagnetically 5 disturbed days, and storm-time variations of them using the data at College, Alaska for periods of no polar-cap absorption from September, 1959 to December, 1960. Then we discuss the relation of the cosmic noise absorption to the chorus and to geomagnetic pulsation at the auroral zone, and do also possible mechanisms of VLF emissions in the outer exosphere.
