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For sky wave propagation of a 10 MHz sig...

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

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A
The critical frequency of a sky wave for reflection from a layer of atmosphere is given by `f_(c)=9(N_("max"))^(1//2)`
where N is the density of electron `"/"M^(3)`.
`10xx10^(6)=9(N_("max"))^(1//2)`
`N_("max")=((10xx10^(6))/(9))^(2)cong 1.2xx10^(12) m^(-3)`.
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