Ionospheric characteristics at Huancayo, Peru, December, 1937, through December, 1938

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Abstract
The first automatic multifrequency ionospheric equipment developed by the Department of Terrestrial Magnetism of the Carnegie Institution of Washington, was installed at the Huancayo Magnetic Observatory in the latter part of 1937 [see 1 under “References” at end of paper]. Continuous recordings over a limited range were started in November and operations over the entire frequency‐range, namely, 16.0 to 0.516 me/sec, were initiated in December, 1937 [2]. Since then the apparatus has operated continuously for 24 hours each day except for occasional short intervals necessary for maintenance to the equipment. The data, therefore, are entirely homogeneous. Quarterly reports on results of these investigations appear regularly in this Journal.
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