Sounding-rocket observation of O II 83.4-nm emission over the polar ionosphere

Details Sounding-rocket observation of O II 83.4-nm emission over the polar ionosphere Sounding-rocket observation of O II 83.4-nm emission over the polar ionosphere

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u...1y&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 21, pp. 1-1, CiteID 2005, DOI 10.1029/2002GL014788

Physics

4

Ionosphere: Topside Ionosphere, Ionosphere: Particle Acceleration, Ionosphere: Polar Cap Ionosphere, General Or Miscellaneous: Instruments Useful In Three Or More Fields, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions

Scientific paper

Results of recent satellite observations indicate that a large amount of O+ are escaping from the terrestrial ionosphere into the magnetosphere. However, either the global distribution or the temporal variation of such O+ escape has not been understood well yet. A 2-Dimensional observation of oxygen ion emission (e.g., O II 83.4 nm) provides crucial information on the oxygen escape processes. In order to establish the basic technology required for such a 2-D (i.e., imaging) observation, we have developed an eXtreme Ultra-Violet (XUV) sensor sensitive to the O II 83.4-nm emission. In this study we present recent results of the observation of O+ ion escape from the ionosphere in the polar cap region using our XUV sensor carried by the sounding rocket SS-520-2. The XUV sensor successfully obtained an altitudinal profile of the intensity of the O II emission from 150 km through 1100 km of altitudes and detected 5-6 Rayleighs of the O II emission from the uppermost part of the ionosphere. The observation suggests that O+ ions convected from the cusp/cleft region exist over the polar ionosphere.

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