Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1831f&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1831
Physics
[2415] Ionosphere / Equatorial Ionosphere, [2471] Ionosphere / Plasma Waves And Instabilities, [2487] Ionosphere / Wave Propagation, [2499] Ionosphere / General Or Miscellaneous
Scientific paper
The occurrence of an additional F3-layer has been reported at Brazilian, Indian and Asian sectors by several investigators. In this paper, we report F3-layer seasonal variations carried out at São José dos Campos (23.2 S, 45.0 W; dip latitude 17.6 S), near the southern crest of the equatorial ionospheric anomaly (EIA), Brazil, as a function of solar cycle. The period from September 2000 to August 2001 is used as representative of high solar activity (HSA) and the period from January 2006 to December 2006 as representative of low solar activity (LSA). This investigation shows that the frequency of occurrence of the F3-layer during HSA is 11 times more than during LSA.
Abalde José Ricardo
Bittencourt J. A.
Klausner Virginia
Roberto Fagundes Paulo
Sahai Yogeshwar
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