8.20 For an invariant latitude of 65°on the Earth, (a) determine the I-shal number and (b) values of the magnetic flux density B at latitudes of 0 30, 45, and 65° on the field line for Bo = 30,500 nT. %3D Answers: (a) L= 5.60; (c) B(0°) = 174 nT, B(30°) = 545 nT, etc.
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