Characteristic Variation of Region F2 Ionization Throughout the Year

Details Characteristic Variation of Region F2 Ionization Throughout the Year Characteristic Variation of Region F2 Ionization Throughout the Year

Jul 1939

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1939natur.144..151a&link_type=abstract

Nature, Volume 144, Issue 3638, pp. 151-152 (1939).

Computer Science

Scientific paper

In a letter from W. M. Goodall, which appeared in Nature of June 10, p. 977, there is made one further step in the elucidation of the complex behaviour of Region F2 of the ionosphere, in that it is shown that there is a better correspondence be­tween ionization and calcium flocculi figures for the central solar disk than there is between ionization and the usual sunspot numbers. From the determined relation between ionization and solar activity (as expressed by the calcium flocculi figures), it is possible to estimate the average seasonal variation of ionization over a number of years, the varying influence of solar activity being removed. Assuming, for ex­ample, that the solar activity had remained constant at a level expressed by the calcium flocculi char­acter figure 3.0 throughout the period 1935-38 (actually, of course, it was gradually altering), the seasonal variation of the Region F2 critical fre­quency at Washington (lat. 39° N.) is as shown in curve A in the accom­panying figure. The trend of such a curve confirms the observations of Appleton and Naismith1,2, who earlier found a similar variation in the northern hemisphere during sun-spot minimum at both Slough and Tromsø during the Polar Year 1932-33, and at Slough in succeed­ing years. The continuance of the radio work at Tromsø by Harang3 has provided further con­firmatory evidence, and we may now feel confident that a curve of this type represents fairly accurately the seasonal variation of noon critical frequency (and thus ionization) in the absence of marked ionospheric storms.

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