Physics
Scientific paper
Feb 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..107k&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 2, pp. 107-115
Physics
Scientific paper
It is shown that on non-stormy days the relationship at night between the equivalent planetary daily amplitude, Ap, and the amount of ionization present at the maximum of the F-layer at temperate latitudes is a striking inverse one, except for a short "anomalous" period during the three mid-winter months when the relationship becomes positive. This relationship suggests a daily correlation of critical frequencies at northern and southern temperate latitudes of the kind which is shown to exist. The seasonal variation of this daily correlation of critical frequencies is explained. It is shown that the general seasonal relationship between [latin small letter f with hook]0F2 and Ap is similar over a wide range of latitudes, and also for both day and night-time data. It appears that effects on storm days can be predicted by simply extrapolating the data for non-stormy days, indicating that magnetic effects produce a certain amount of ionospheric disturbance at all times. Because magnetic activity produces a decrease of [latin small letter f with hook]0F2 below the normal value in summer, and an increase in winter, the ratio of mean [latin small letter f with hook]0F2 winter/mean [latin small letter f with hook]0F2 summer is substantially bigger than that for the undisturbed ionosphere. The relationship between Ap and [latin small letter f with hook]0F2 gives rise to an equation standard deviation of [latin small letter f with hook]0F2 = 0.7 × standard deviation of K-index which is applicable to night-to-night variations during a month. It is shown that the apparent general night-time and day-time relationships between Ap and [latin small letter f with hook]0F2 are different. The regular diurnal variation of the correlation between the critical frequencies observed at two stations having the same longitude and situated 1700 km apart is indicated and an explanation suggested. It is shown that Ap exhibits marked auto-correlation from day to day; this phenomenon is probably partly responsible for the day-to-day correlation of [latin small letter f with hook]0F2 observed at a single station.
Graham Carl
King John W.
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