@InProceedings{AlmeidaPime:2009:AiStIo,
author = "Almeida, Aline A. de and Pimenta, Alexandre Alvares",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Airglow study of ionospheric plasma irregularities",
booktitle = "Proceedings...",
year = "2009",
organization = "Iaga, 2009.",
keywords = "Plasma irregularities, airglow.",
abstract = "An instrument for all-sky spectrophotometric imaging was developed
for airglow measurements. A 630.0 nm airglow imaging system has
been developed for ground-based studies of the optical signatures
of tropical plasma irregularities in the F-region. The system was
designed for narrowband interference filters (10 angstrom full
width at half power) with all-sky (180°) lenses and records images
photographically by using a standard Nikon D300 camera. A field
test of the apparatus was conducted on Cachoeira Paulista close to
the southern crest of the equatorial ionization anomaly (22.7°S,
45.0 °W, dip angle = -28°) from March 20 to March 29, 2009. The
optical signature of plasma irregularities are airglow depletion
bands in the OI 630 nm emission like plasma bubbles or MSTIDs. The
production of the OI 630.o nm emission depends on the molecular
oxygen density [O2] and on the oxygen ion density [O+]. The oxygen
ion density [O+] is approximately equal to the electron density in
the F-region. The height of the F-layer peak electron density is
around 350400 km, while the molecular oxygen density [O2]
increases with decreasing height. Thus, the OI 630 nm emission
peak occurs in the bottomside of the F region around 220300 km.
The initial results to come from these observations show the
presence of airglow depletions in the OI 630 nm. In this work, the
characteristics and resolution of the all-sky developed is present
and discuss.",
conference-location = "Sopron, Hungary",
conference-year = "23-30 Aug.",
language = "en",
urlaccessdate = "04 jun. 2024"
}