On the day-to-day variation of foF2 and M(3000)F2

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Adv Space Res | / 6卷 / 873-876期
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Studying the relative deviations of the hourly daily values of the critical frequency foF2 from their corresponding monthly median we are lead to define as 'disturbed' those days for which the absolute value of the 3-hour average of the relative deviation at least once exceeds 0.3. The relative deviations of foF2 and of the propagation factor M(3000)F2 are evaluated for quiet days in this sense. Furthermore some examples of disturbed ionosphere are examined and their dependence on season, solar activity and location is pointed out.
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