Computer Science – Sound
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa32a0678n&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA32A-0678
Computer Science
Sound
2400 Ionosphere, 2467 Plasma Temperature And Density
Scientific paper
We have measured the OII emission from the F-layer ionosphere by the sounding rocket SS-520-2, which was launched from the Svalbard Rocket Experiment Site, Ny Aalesund in Norway, last December. This was the first in situ EUV observation of the ionospheric Oxygen ions. Oxygen ion is the main component of the ionospheric F layer. We have studied the oxygen ions distribution in the ionosphere by means of optical observation. Oxygen ions resonantly scatter the solar OII(83.4nm) line. We have built an extreme ultraviolet (XUV) scanner, which is sensitive to the OII 83.4-nm emission and contamination free from the Lyman-alpha line, especially for the sounding rocket SS-520-2. The rocket flew along the magnetospheric cusp region, and 600 sec after the launch it reached its apex at 1108 km in altitude, and its total operation time was 1100sec. In the downleg of the flight, below 350 km in altitude (900-1100sec after the launch), XUV observed very high intensity (200~300 Rayleigh) of OII emissions from the ionospheric F layer. We have estimated the column density of the oxygen ion along the XUV_fs line-of-sight from the measured OII intensity. In this presentation, we will discuss the density profile of the oxygen ions in the ionospheric F region, i.e., the dependence on the altitude, longitude and latitude. We will compare the obtained distribution with the model of the ionosphere.
Miyake Wataru
Nakamura Maho
Nakasaka Y.
Tashiro S.
Yamazaki Akihiro
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