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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Study of the F3 and StF4 Layers at Tucuman Near the Southern Crest of the Equatorial Ionization Anomaly in Western South America

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Author(s):
Tardelli, A. [1] ; Pezzopane, M. [2] ; Fagundes, P. R. [1] ; Venkatesh, K. [1] ; Pillat, V. G. [1] ; Cabrera, M. A. [3, 4] ; Ezquer, R. G. [5, 4, 6]
Total Authors: 7
Affiliation:
[1] Univ Vale Paraiba, Inst Pesquisas Desenvolvimento, Sao Jose Dos Campos - Brazil
[2] Ist Nazl Geofis & Vulcanol, Rome - Italy
[3] Univ Nacl Tucuman, Lab Telecomunicac, FACET, San Miguel De Tucuman, Tucuman - Argentina
[4] Univ Tecnol Nacl, Fac Reg Tucuman, CIASUR, San Miguel De Tucuman - Argentina
[5] Consejo Nacl Invest Cient & Tecn, Buenos Aires, DF - Argentina
[6] Univ Nacl Tucuman, Lab Ionosfera, Dept Fis, FACET, San Miguel De Tucuman, Tucuman - Argentina
Total Affiliations: 6
Document type: Journal article
Source: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; v. 123, n. 3, p. 2156-2167, MAR 2018.
Web of Science Citations: 2
Abstract

The present investigation reports for the first time seasonal and solar activity variations of F3 and StF4 layers at the low-latitude station of Tucuman (26.9 degrees S, 65.4 degrees W; dip latitude 13.9 degrees S), Argentina, by considering ionograms recorded from 2007 to 2015 by an Advanced Ionospheric Sounder-Istituto Nazionale di Geofisica e Vulcanologia (AIS-INGV) digital ionosonde. Occurrences of F3 and StF4 layers are found to be higher during summer months, while they are almost nil in winter. Moreover, occurrences of F3 and StF4 layers show a solar activity dependence with higher values during high solar activity. The solar activity dependence of F3 over Tucuman is similar to that reported earlier for the low-latitude station of SAo Jose dos Campos, Brazil (dip latitude 14.1 degrees S), but different than that reported for the near-equatorial station of Palmas (dip latitude 6.6 degrees S), Brazil. On the other hand, the solar cycle dependence of StF4 layer is consistent with the one obtained at Palmas. This highlights the complex nature of electrodynamics characterizing the ionosphere from the magnetic equatorial to low latitudes. Moreover, as shown in previous studies, the StF4 layer is always preceded and followed by the F3 layer, and it shows a shorter lifetime than that of the F3 layer. During the considered period, 1812 days were analyzed and the F3 layer was found in 370 days (20.4%), while the StF4 layer was found in 41 days (2.3%). This means that the StF4 stratification is seen during 11% of F3 layer days. (AU)

FAPESP's process: 12/08445-9 - Study of day-to-day variability of the mesosphere, thermosphere and ionosphere at low latitude and equatorial region, during the solar cycle 24
Grantee:Paulo Roberto Fagundes
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/24791-2 - Study of ionospheric f layer multiple stratification near equatorial region and low latitude
Grantee:Alexandre Tardelli
Support type: Scholarships in Brazil - Post-Doctorate