Long term trends in the frequency of occurrence of the F3 layer over Fortaleza, Brazil

Details Long term trends in the frequency of occurrence of the F3 layer over Fortaleza, Brazil Long term trends in the frequency of occurrence of the F3 layer over Fortaleza, Brazil

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1409b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 12-14, p. 1409-1412.

Physics

15

Scientific paper

Recent studies using model calculation and ionospheric observations have revealed the existence of an additional layer in the topside equatorial ionosphere, the F3 layer. The observations using bottomside ionograms from locations close to the magnetic equator in Brazilian region have shown that the occurrence of the layer is very high from December to February (local summer) and from June to August (local winter). In fact, for the year 1995 the occurrence of the F3 layer is />75% during the months of January, February and December, and it is />65% for the period of June, July and August (Geofisica Int. 39 (2000) 57). In this work, we use 25 years of data for the months of January and August to investigate how the layer occurrence varies with the magnetic dip angle and solar activity.

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