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Home » The maximum frequency for reflection of sky waves from a certain layer of the ionosphere is found to be f max = 9(Nmax) 1/2, where Nmax is the maximum electron density at that layer of the ionosphere. On a certain day, it is observed that signals of frequencies higher than 5MHz are not received by reflection from the F1 layer of the ionosphere while signals of frequencies higher than 8MHz are not received by reflection from the F2 layer of the ionosphere. Estimate the maximum electron densities of the F1 and F2 layers on that day.
The maximum frequency for reflection of sky waves from a certain layer of the ionosphere is found to be f max = 9(Nmax) 1/2, where Nmax is the maximum electron density at that layer of the ionosphere. On a certain day, it is observed that signals of frequencies higher than 5MHz are not received by reflection from the F1 layer of the ionosphere while signals of frequencies higher than 8MHz are not received by reflection from the F2 layer of the ionosphere. Estimate the maximum electron densities of the F1 and F2 layers on that day.
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The maximum frequency for reflection of sky waves from a certain layer of the ionosphere is found to be f max = 9(Nmax) 1/2, where Nmax is the maximum electron density at that layer of the ionosphere. On a certain day, it is observed that signals of frequencies higher than 5MHz are not received by reflection from the F1 layer of the ionosphere while signals of frequencies higher than 8MHz are not received by reflection from the F2 layer of the ionosphere. Estimate the maximum electron densities of the F1 and F2 layers on that day.

Answer:

Expression fpor the maximum frequency is:

fmax = 9(Nmax)1/2

According to the question, for Layer F1, fmax = 5 MHz

{{N}_{\max }}=\frac{F_{\max }^{2}}{9\times 9}=\frac{5\times {{10}^{6}}\times 5\times {{10}^{6}}}{9\times 9}

{{N}_{\max }}=3.086\times {{10}^{11}}

For layer F2, fmax = 8 MHz

{{N}_{\max }}=\frac{F_{\max }^{2}}{9\times 9}=\frac{8\times {{10}^{6}}\times 8\times {{10}^{6}}}{9\times 9}

{{N}_{\max }}=7.9\times {{10}^{11}}

 

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