Question:

For sky wave propagation of $10\, MHz$ signal, what should be the minimum electron density in ionosphere?

Updated On: Jul 28, 2022
  • $\sim1.2 \times 10^{12} m^{-3}$
  • $\sim 10^{6} m^{-3}$
  • $\sim 10^{14} m^{-3}$
  • $\sim 10^{22} m^{-3}$
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The Correct Option is A

Solution and Explanation

The critical frequency of sky wave undergoing reflection from a layer of atmosphere is $f_{c}=9 \sqrt{N_{\max }}$ where $N$ is electron density per $m ^{3}$. $\therefore N_{\max } =\frac{f_{c}^{2}}{81}=\frac{\left(10 \times 10^{6}\right)^{2}}{81}$ $=1.2 \times 10^{12} m ^{3}$
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