Development of Instrument for the Resonance Scattering Emission of Oxygen Ion (O II :83.4nm) — Toward the Imagery of Magnetosphere —

摘要

According to previous theories a large number of oxygen ions are not able to escape from the ionosphere to the magnetosphere due to its heavy mass and loss process in the upper atmosphere. Recent satellite observations, however, reveal that oxygen ions of the ionospheric origin exist in the magnetosphere, and that the outflow flux from the polar ionosphere is comparable to that of hydrogen ions, which have its light mass, during the high solar activity and the high geomagnetic activity. The distribution of oxygen ions provides the interpretation of the plasma transfer during the high activity, and gives us the effective information for monitoring the space weather. The remote-sensing method is useful for the measurement of the distribution of oxygen ions all over the magnetosphere. We advance development of new optics for the resonance scattering emission of oxygen ions.