Computer Science – Sound
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa23a1872c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA23A-1872
Computer Science
Sound
[2400] Ionosphere, [2415] Ionosphere / Equatorial Ionosphere, [2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities
Scientific paper
The Post-Midnight Spread-F is usually observed at low latitudes principally during low solar activity, as has been pointed out by several authors. The last recent and prolonged low solar activity period has been received special attention because the unusual low neutral/ionospheric densities and irregularities. Recent reports presented the occurrence of deep plasma depletions/trenches after midnight and near dawn as detected by the CNOFS satellite during solar minimum. Although the Post Midnight Spread-F has been reported by several studies at other longitudinal sectors, this is the first time that the observations were performed after midnight over Brazilian sector, using simultaneous sounding with VHF 30 MHz coherent backscatter radar and a digisonde DGS 256, during June Solstice of 2011. The observed structures in the RTI plots are associated with an unusual and low intensity spread-F pattern seen by the digisonde. The studied structures occur at the period post midnight or near dawn, below 500 km height, present short duration and are distinct of the usually observed pre-midnight bottom-type, bottomside and plumes structures observed during spread-F season in Brazil between October and March. Additionally, we analyze the total electron content during the events.
Batista Inez S.
Candido C. M.
Paula E. R.
Rodrigues Fabiano S.
Shume E.
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