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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.40 [2011] >
IJRSP Vol.40(3) [June 2011] >
| Title: | Ionospheric foF2 variability at equatorial and low latitudes during high, moderate and low solar activity |
| Authors: | Akala, A O
Somoye, E O
Adeloye, A B
Rabiu, A B |
| Keywords: | Equatorial ionosphere
foF2 variability
Solar activity
Ionospheric variability |
| Issue Date: | Jun-2011 |
| Publisher: | NISCAIR-CSIR, India |
| PACS No.: | 94.20.dj; 94.20.dt; 94.20.Vv |
| Abstract: | This paper presents diurnal, seasonal and
solar activity effects on the variability of ionospheric foF2 in the equatorial
and low latitude regions. Three ionosonde stations, viz. Huancayo (12.0°S, 75.3°W,
dip 1.8°N), Ouagadougou (12.4°N, 1.5°W, dip 2.8°N) and Vanimo (2.7°S, 141.3°E,
dip 22.5°S) were considered for the investigation. Generally, the diurnal
analysis revealed that the critical frequency of the F2 layer (foF2) is more
susceptible to variability during the nighttime than the daytime, with two
characteristic peaks, pre-sunset peak (12–50%) and post-midnight peak (22–70%).
Seasonally, the June Solstice maximum was observed at Vanimo, while the peaks
for other seasons were observed at Huancayo with the overall non-typical
pattern of seasonal characterization for foF2 variability. At all stations,
foF2 variability was noticed to be highest for the low solar activity year.
Overall, equatorial foF2 variability increases with decreasing solar activity. |
| Page(s): | 124-129 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-105X (Online); 0367-8393 (Print) |
| Source: | IJRSP Vol.40(3) [June 2011]
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