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Geographic sites of the two earthquake epicenters (red star) and their respective Ionosonde receiver stations (yellow plus sign). The magnitude, happening time, geographic coordinates of the epicenter, the radius of the earthquake preparation zone of these events and the geographical coordinate of the ionosonde receiver to collect foF2 hourly data and its distance from the earthquake are summarized in Table 1.  

Geographic sites of the two earthquake epicenters (red star) and their respective Ionosonde receiver stations (yellow plus sign). The magnitude, happening time, geographic coordinates of the epicenter, the radius of the earthquake preparation zone of these events and the geographical coordinate of the ionosonde receiver to collect foF2 hourly data and its distance from the earthquake are summarized in Table 1.  

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Article
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This paper presents a comparative study on the important parameter of the ionosphere critical frequency of F2 layer (foF2) retrieved by means of ground based ionosonde radars and predicted by International Reference Ionosphere extended till plasma sphere (IRIPLAS-2011) model at two different locations including Northern Sumatra (Geographic Lat....

Contexts in source publication

Context 1
... IRIPLAS-2011 the respective data is retrieved from the same geographical coordinates as done for the same coordinates of real ionosonde data. Figure 2 presents the locations of the earthquake epicenters (star) and foF2 data receiver stations (+), in geographic coordinates. The magnitude, happening time, geographic coordinates of the epicenter, the radius of the earthquake preparation zone of these events and the geographical coordinate of the ionosonde receiver to collect foF2 hourly data and its distance from the earthquake are summarized in Table 1. ...
Context 2
... as depicted in Figure 3c.In Figure 3d the anomalies detected on disturbed day falls on 4,7 and 13 April, so they are shown as D character as the geophysical activities were disturbed on 4,7 and 13 April as revealed in Figure 3a-b whereas on 5,8,10,11,13 to18 April, during the quiet geomagnetic condition the perturbations are marked as P alphabet. (2.311°N, 93.063°E) obtained by IRIPLAS-2011 model. Figure 4 shows the percentage of foF2 deviation for the same observation period presented in Figure 3. In Figure 4, the positive and negative values of the strained foF2% show the discrepancy pertaining to the upper and lower bound, respectively. Figure 3d significant increases in ΔfoF2% of about 1-2.7 ...

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