Interrelations of Upper Atmosphere Disturbance Phenomena in theAuroral Zone

概要

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Interrelations of the phenomena of upper atmosphere disturbances in high latitudes, such as magnetic disturbance, auroral displays, anomalous ionization in the ionosphere, X-ray and radio wave emissions, are discussed with special reference 1) to the numerical relations of quantities of the disturbances and 2) to the spatial distribution of disturbance area. As to the numerical relations, the effects of primary electron beams, for example, ionization, excitation and emission of X-ray and radio waves, were shown to be consistent with the observational results, though a considerable scattering of numerical values occurs owing to the fluctuation of energy spectrum of primary electrons. The examination of spatial distribution of disturbance area has led to a conclusion that 1) the electron precipitation responsible for various disturbance phenomana can be divided into three groups, i.e. flash precipitation group, quasisteady precipitation group and noon precipitation group, and 2) these groups would correspond respectively to the electron precipitation from the open-close boundary of magnetic lines of force in geomagnetic cavity, to the electron precipitation from the trapping region, and to that from neutral regions of cavity surface in the day side.
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