Accession Number : AD0610854

Title :   ASSOCIATION BETWEEN VLF EMISSIONS AND FLICKERING AURORA,

Corporate Author : STANFORD UNIV CALIF STANFORD ELECTRONICS LABS

Personal Author(s) : Ungstrup,Eigil

Report Date : JUN 1964

Pagination or Media Count : 7

Abstract : During a VLF experiment at Fairbanks, Alaska, an unusual chorus type of emission with a warbling or fluttering sound was heard on four different occasions. An example of the spectrum of the emission is presented which shows a series of bursts in the 1000- to 1800-cps range. Some of the bursts, which last for 1 to 3 sec, show a welldeveloped fine structure with several sharply rising tones at irregular spacing, each lasting about 0.1 sec. The emission bursts were associated with active periods in the aurora where groups of flashes or flickerings took place and, in the opinion of the observer, each of the short, sharply rising tones was associated with a flash in the aurora. Also presented is a band of hiss in the 600- to 1200-cps range.

Descriptors :   (*AURORAE, ATMOSPHERICS), (*ATMOSPHERICS, VERY LOW FREQUENCY), MAGNETIC STORMS, ELECTROMAGNETIC RADIATION, SPECTROSCOPY, ALASKA, GEOPHYSICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE