Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13b1894w&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA13B-1894
Physics
Plasma Physics
[2419] Ionosphere / Ion Chemistry And Composition, [2481] Ionosphere / Topside Ionosphere, [7800] Space Plasma Physics, [7954] Space Weather / Magnetic Storms
Scientific paper
Doubly-charged ions are peculiar atmospheric species interesting to study due to their exotic or unexpected photo-chemistry and their high reactivity. We focus here on the O++ doubly-charged ion, which was detected in the terrestrial atmosphere in 1967 by mass spectrometry. Its photochemistry has been characterized in a number of studies. Excited state fluorescence of this ion is well known, since its doublet centered around 500 nm has been used as a tracer of electron densities and temperatures in gaseous nebulae since the 1940's. O III emissions have been observed in the terrestrial atmosphere in the extreme ultraviolet region. We report here the new and unambiguous detection of two emission lines of O III at 495.8911 and 500.6843 nm, with the Ultraviolet and Visible Echelle Spectrograph (UVES) mounted on UT2 of the Very Large Telescope (VLT) in Chile. The measurements were performed after sunset, October 30, 2003 during the so-called "Halloween" storm. The intensities of these emissions are ~70 mRayleigh, and ~260 mRayleigh, respectively. We discuss the possible methods of production of the ion. We also discuss the potential identification of O III emission near 166 nm in a spectrum acquired with the Hopkins Ultraviolet Telescope (HUT) telescope on the dayside, in December 1990. These emissions constitute a new diagnostic of the state of the ionosphere, with potentially interesting applications to Venus and Mars.
Slanger Tom G.
Thissen Roland
Witasse O. G.
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