FURTHER INVESTIGATIONS OF STORM-TIME SUB ELF EMISSIONS

Autor:	K. D. Amundsen, Lee Tepley, R. C. Wentworth
Rok vydání:	1964
Předmět:	Geography Meteorology Local time Atmospherics Storm Sunset Pacific ocean Occurrence time Line (formation) Exosphere
DOI:	10.21236/ad0623993
Popis:	This report is concerned with the following properties of certain types of sub ELF emissions (delta f = 0.2-5 cps) observed during magnetic storms: (1) The aural characteristics of the emissions obtained from time- compressed magnetic tape; (2) the frequency-time (f-t) characteristics of the emissions as displayed on sonagrams; (3) the degree of simultaniety of emissions observed simultaneously at widely separated locations (the four Lockheed Pacific Ocean Stations); and (4) the relationships between the occurrence times of the emissions and the following quantities: (a) Magnetic Kp index, (b) local time of day, and (c) local sunset. Perhaps the most interesting result of the investigation is the observation that storm-time sub ELF emissions seem to excite natural resonances in the exosphere. This effect is explained in terms of an existing theoretical model. Also of interest is the observation that the signals are most frequently observed near 800 PM local time. The occurrence time seems to indicate that the signal source is asymmetric with respect to the sun-earth line.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8731f4dcef0de2b5c1c3458150c0b980 https://doi.org/10.21236/ad0623993 Zobrazit plný text záznamu