Accession Number : AD0698060

Title :   TRIGGERING OF HYDROMAGNETIC 'WHISTLERS' BY SFERICS,

Corporate Author : LOCKHEED MISSILES AND SPACE CO PALO ALTO CALIF LOCKHEED RESEARCH LAB

Personal Author(s) : Fraser-Smith,A. C. ; Roxburgh,K. R.

Report Date : 26 NOV 1968

Pagination or Media Count : 4

Abstract : Since 1962, the regularly structured geomagnetic micropulsations which occur within the Pc 1 frequency range (0.2-5 Hz) have aroused continued interest. Commonly known as pearls, or hydromagnetic (hm) emissions, the micropulsations exhibit a repetitive rising fine structure when displayed on a frequency-time spectrogram. It has been shown that the fine structure elements observed at geomagnetically conjugate stations are 180 degrees out of phase, i.e., they alternate between the two stations. Another important characteristic of the micropulsations is a gradual increase of signal strength to some maximum level followed by an equally gradual decay. These observations enable a theory to be formulated for the generation mechanism of the signals. (Author)

Descriptors :   (*WHISTLERS, SOURCES), ATMOSPHERICS, REFLECTION, LIGHTNING, MAGNETOSPHERE, VERY LOW FREQUENCY, CHARGED PARTICLES, CALIFORNIA

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE