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Title: Variability of the vertical extent of ionospheric E-layer over a station within equatorial anomaly region
Authors: Rabiu, A B
Abe, O E
Adeniyi, J O
Keywords: Equatorial ionosphere anomaly
E-layer vertical extent
Low solar activity
Issue Date: Oct-2012
Publisher: NISCAIR-CSIR, India
PACS No.: 94.20.dt; 94.20.Vv; 94.20.wq
Abstract: The variability of the vertical extent of the E-layer of the ionosphere (VE) has been examined within the equatorial ionospheric anomaly region, taken as the difference between 90 km which is the assumed lower boundary of the layer and the virtual height values measured with an ionosonde at Ouagadougou in Burkina Faso, West Africa (geographic lat 12.4°N, long 1.5°W and magnetic dip 5.9°N) for low solar activity year 1985 and high solar activity year 1990. The vertical extent is a measure of the vertical altitude of E-region of the ionosphere. The vertical extent of the E-layer was observed to be high (36-40 km) at sunrise and sunset while low (18-22 km) at noon for both years. Seasonal variation shows that vertical extent of E-layer during the solar minimum (maximum) is higher in September (March) equinox and lower in March (September) equinox. The vertical extent of E-layer has been found to be an unstable membrane as it varied from hour to hour, day to day, month to month and season to season in response to the solar activity. The VE is thicker in the low solar activity (26.30 ± 3.47 km) than the high solar activity (23.01 ± 2.62 km), which implies that increase/decrease in the solar activity results in decrease/increase in vertical extent of E-layer. Precisely, 5.4% (35.9%) variation in low (high) solar activity is accounted for by the variability in solar activity while the remaining percentage may be due to other factors.
Page(s): 536-542
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.41(5) [October 2012]

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