NDLI: Noise Levels in the American Sub-Arctic

Content Provider	IEEE Xplore Digital Library
Author	Gerson, N.C.
Copyright Year	1931
Abstract	On the basis of six months' data, a comprehensive study was instituted of the atmospheric static intensity at a frequency of 150 kc in northern and southern Canada. Three noise levels, the average (a measure of the mean atmospheric noise level), quasi peak (a measure of the highest noise bursts indicated by the recorder), and absolute quasi peak (a measure of the maximum value of the highest noise bursts indicated by the recorder) were determined. The average level furnished a record of the average noise caused by bursts and background rumble; the quasi-peak level of atmospherics furnished a record of noise bursts (superimposed upon the usually negligible background); and the absolute quasi-peak level supplied the highest value of the bursts. Various temporal and spatial distribution studies of the intensity of atmospherics were effected, such as diurnal, seasonal, latitudal, and the like. The diurnal trend is absent or small during winter but increases markedly as summer is approached. The familiar rise and decline of noise intensity about sunset and sunrise, respectively, is found. Toward summer the increase in noise level rise occurs earlier and earlier, sometimes taking place shortly after noon, local standard time (LST). The daily cycle usually attains a minimum after sunrise and a maximum after sunset, although exceptions are found. Seasonally, the static intensity is higher in June than January. At southern stations noise increased progressively from January to June.
Starting Page	905
Ending Page	916
Page Count	12
File Size	2762111
File Format	PDF
ISSN	00968390
Volume Number	38
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1950-08-01
Access Restriction	Subscribed
Rights Holder	The Institute of Radio Engineers, Inc. (IRE)
Subject Keyword	Noise level Atmospheric measurements Noise measurement Frequency measurement Instruments Background noise Lakes Standardization Atmospheric waves Phase noise
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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