(adsbygoogle = window.adsbygoogle || []).push({}); The electron densities, ne, at any height h < 300 km on the lower side of an F2 layer can be described by a scale height relationship:

[tex] n_{e}(h) = n_{e}(300) \exp\left(\frac{0.75(h-300)}{H_{O}}\right) [/tex]

where HO is the neutral atomic oxygen scale height. If the ionosphere has an isothermal temperature of 1500 K and a 9 MHz ionosonde pulse is reflected from 200 km, calculate the electron density at 300 km. [Magnetic field effects may be ignored and you may assume that we only have an F2 layer]

i can easily calculate the scale height Ho. The problem is... how does the EM pulse relate to the density of electrons in the atmosphere?

am i missing something... some formula that sohuld be used?

should it be

[tex] f = 9 \times 10^{-3} \sqrt{N_{e}} [/tex]

where Ne is the density of electrons in the atmosphere (F2 region)? That represents a critical frequency. Typically teh F2 region's threshold is 3-30 Mhz isnt it ?

your help is greatly appreciated! Thank you

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# Homework Help: Radio waves

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