Optical Observation of Oxygen Ion Upflow in the Cusp/Cleft Region

Details Optical Observation of Oxygen Ion Upflow in the Cusp/Cleft Region Optical Observation of Oxygen Ion Upflow in the Cusp/Cleft Region

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11c0455t&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM11C-0455

Computer Science

Sound

2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

We built the Extreme ultraviolet scanner (XUV) for imaging oxygen ions to outflow from the polar ionosphere into the magnetosphere. The XUV onboard a sounding rocket SS-520-2 imaged the oxygen ions above 1000 km altitude near the polar cusp on December 4, 2000. The XUV is a normal incidence telescope that has a peak sensitivity at the wavelength 83.4 nm of OII emission and consists of a Mo coated mirror, a band pass filter and a channel electron multiplier. The band pass filter selectively transmits OII emission and eliminates background emissions such as HeI emission at the 30.4 nm, HeII emission at the 58.4 nm, and HI emission at the 121.6 nm. The observed OII emission intensity is proportional to the ion density integrated along the line of sight. Therefore the observed OII emission intensity distribution makes possible to determine the oxygen ion distribution.
After 0928UT, the sudden increase in the OII emission intensity was observed from the cusp region identified by the radar observation. In this presentation, we will discuss the cause of the sudden increase in the OII emission intensity in comparison with the result of ground-based observations.

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