For the Schumann resonances of Section 8.9 calculate the Q values on the assumption that the earth

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For the Schumann resonances of Section 8.9 calculate the Q values on the assumption that the earth has a conductivity σe and the ionosphere has a conductivity σi, with corresponding skin depths 8e and δi.

(a) Show that to lowest order in h/a the Q value is given by Q = Nh/(δe + δi) and determine the numerical factor N for all.

(b) For the lowest Schumann resonance evaluate the Q value assuming σe = 0.1 (Ωm)–1, σi = 10–5 (Ωm)–1, h = 102 km.

(c) Discuss the validity of the approximations used in part a for the range of parameters used in part b.

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