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- W2916175909 abstract "Ionospheric characteristics at the Huancayo Magnetic Observatory (12° 02′.7 south, 75° 20′.4 west) of the Department of Terrestrial Magnetism, Carnegie Institution of Washington, during the year 1940 have been published in quarterly reports in this JOURNAL [see 1 under 1 “References” at end of paper]. The present paper is a summary of reports on the data of 1940 and is the third of a series of annual papers summarizing ionospheric conditions at Huancayo [2]. Photographic records have been obtained with multifrequency equipment sweeping over a frequency-range of 16.0 to 0.516 Mc/sec every 15 minutes continuously for 24 hours each day since December, 1937. This paper continues the method of presentation used in the annual summaries for 1938 and 1939 [2]. Ionospheric characteristics are presented as contour-maps illustrating mean diurnal variation in critical frequency, minimum virtual height, and height of maximum electron-density for each region. Full lines are contours of frequency or height and dotted lines represent the curve of mean data for the month indicated. These figures afford an effective means of distinguishing general characteristics and month-to-month trends by casual inspection." @default.
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- W2916175909 date "1941-01-01" @default.
- W2916175909 modified "2023-09-25" @default.
- W2916175909 title "Ionospheric Characteristics at Huancayo, Peru, for the Year 1940" @default.
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- W2916175909 doi "https://doi.org/10.1029/te046i004p00435" @default.
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