The 0.23‐day (5.5 hours) time lag reported by Jacobs for the response time of the atmosphere to geomagnetic disturbances in the 165–200 km altitude region has been found to give rise to an incorrect interpretation for the time constant of the atmosphere at those altitudes. By re‐examining Jacobs' data and extending his analysis, actual time delays of 0.48‐day by which the atmospheric response physically lags the peak of the geomagnetic disturbances are demonstrated. It is also shown that this time lag is dependent upon the intensity of the geomagnetic perturbation, which for unusually large storms, may be as short as 0.10‐day.
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