| Full text | |
| Author(s): |
Tardelli, A.
;
Fagundes, P. R.
;
Pezzopane, M.
;
Venkatesh, K.
;
Pillat, V. G.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; v. 121, n. 12, p. 12116-12125, DEC 2016. |
| Web of Science Citations: | 5 |
| Abstract | |
The study of multiple stratification of the F layer has the initial records in the midtwentieth century. Since then, many studies were focused on F-3 layer. The diurnal, seasonal, and solar activity variations of the F-3 layer characteristics have been investigated by several researchers. Recently, investigations on multiple stratifications of F layer received an important boost after the quadruple stratification (StF-4) was observed at Palmas (10.3 degrees S, 48.3 degrees W; dip latitude 6.6 degrees S-near-equatorial region), Brazil. The present study reports the latest findings related with the seasonal and solar activity characteristics of the F-3 layer and StF-4 near the equatorial region during the period from 2002 to 2006. A significant connection between StF-4 and F-3 layer has been noticed, since the StF-4 is always preceded and followed by a F-3 layer appearance. However, the F-3 layer and the StF-4 present different seasonal and solar cycle variations. At a near-equatorial station Palmas, the F-3 layer shows the maximum and minimum occurrences during summer and winter seasons, respectively. On the contrary, the StF-4 presents the maximum and minimum occurrences during winter and summer seasons, respectively. While the F-3 layer occurrence is not affected by solar cycle, the StF-4 appearance is instead more frequent during high solar activity. (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 Opportunities: | 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 Opportunities: | Scholarships in Brazil - Post-Doctoral |