The E and F region apparent and true drifts over the equatorial station Thumba are studied for the period 1964-69 in relation to the solar activity. The apparent drift is found to reduce slightly while the true drift is reduced considerably, with the increasing solar activity. This result is interpreted by comparing the sensitivity factors for Ne and the solar daily range RH of the earth's magnetic field.
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Misra et al. (1971) studied this question.
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