O II (83.4 nm) Emission Observation by the Extreme Ultraviolet Sensor onboard the Sounding Rocket SS-520-2

Computer Science – Sound

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2431 Ionosphere/Magnetosphere Interactions (2736), 2475 Polar Cap Ionosphere, 2494 Instruments And Techniques

Scientific paper

The sounding rocket SS-520-2 was launched from the Svalbard Rocket Experiment Site on December 4, 2000, and flew under the magnetospheric cusp region. The boarded extreme ultraviolet sensor (XUV) was sensitive to the O II emission from the outward flowing ions from the polar cap region and the ionospheric F layer. The O II (83.4 nm) emission in the magnetosphere is usually difficult to be separated from the H Lyman-Alpha emission (121.6 nm) because the intensity of the H Lyman-Alpha emission from the geocorona is over 105 stronger than that of the OII emission estimated by the previous in-situ observation. The XUV sensor was designed to be contamination free especially from the strong H Lyman-Alpha. In spite of the fact that the XUV sensore is not necessarily very sensitive to the OII emission, the sufficient accumulation time enabled us to detect the O II emissions from the ionospheric F layer and the polar wind. In this presentation we will discuss the separation between the O II emissions from the ionospheric F layer and the polar wind. This success is the first attempt to take two-dimensional images of the oxygen ion distribution around the earth via the optical remote sensing. This experiment will lead to image the magnetospheric plasma distribution and the interaction between the planetary ionospheric/atomospheric plasma and the solar wind.

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