Measurements of F2‐region ionization over New Zealand

Abstract
(1) Introduction—Compared with the other two main ionized regions of the upper atmosphere (E‐ and F1‐regions) the highest and most richly ionized region (F2) presents theoretical problems which can be discussed adequately only when data collected in many different places of the Earth's surface can be examined simultaneously. The situation is similar to that of terrestrial magnetism in that the observations at one observatory cannot yield sufficient data upon which a theoretical discussion may be based.Amongst the many observations which can be made with wireless waves reflected from the F2‐region the most fundamental are concerned with the measurement of the maximum charge‐density of this region. In view of the apparently anomalous behavior of this region it is of interest to investigate firstly the diurnal and secondly the seasonal variation of the maximum charge‐density of the region. Thirdly the wide fluctuations of this quantity which occur from day to day are of interest since they appear to be intimately connected with other geophysical occurrences.

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