HR: 1330h
AN: SA12A-1080    [PDF]
TI: O$^+$ $^4$P-$^4$D$^0$ Lines in Aurora over Svalbard
AU: Ivchenko, N
EM: myk@phys.soton.ac.uk
AF: School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ United Kingdom
AU: Ivchenko, N
EM: myk@phys.soton.ac.uk
AF: Alfven Laboratory,, KTH, Stockholm, S10044 Sweden
AU: * Lummerzheim, D
AF: Geophysical Institute, University of Alaska, 903 Koyukuk Drive, Fairbanks, AK 99775-7320 United States
AU: Rees, M H
AF: School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ United Kingdom
AU: Lanchester, B S
AF: School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ United Kingdom
AU: Galand, M
AF: Center for Space Physics, Boston University, 725 Commonwealth Avenue, Boston, MA 02 215 United States
AU: Throp, K
AF: School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ United Kingdom
AB: Spectrographic Imaging Facility (SIF) at the auroral station near Longyearbyen, in Svalbard, Norway, measures auroral spectra in three wavelength intervals (H$_{\beta}$, N$_2^+$ 1N(0,2) and N$_2^+$ 1N(1,3)), and images the aurora in the field aligned direction. Oxygen ion $^4$P-$^4$D$^0$ multiplet (4639-4696~{\AA}) is blended with the N$_2^+$ 1N(1,3) band. SIF observations of the intensity of this multiplet, and its relation to the other emissions are presented. The spectral data are used together with the images, and the incoherent scatter radar, to study the multiplet in context of different types of aurora. Typically, the intensity of the multiplet is about 0.1 of the N$_2^+$ 1N(0,2) band. This ratio is enhanced when the ionisation in the upper E-layer (140-190~km) is significant with respect to the E-layer peak below 130~km. Rayed arcs were observed on one such occasion, whereas on other occasions the intensity was below the threshold of the imager. The occurrence of the multiplet lines in proton aurora is discussed as well.
DE: 0310 Airglow and aurora
SC: SPA - Aeronomy [SA]
MN: 2003 Fall Meeting