Accession Number : AD0422949

Title :   ELECTRON DENSITY PROFILE IN THE IONOSPHERE D-REGION. CONSTRUCTION OF A MODEL ACCOUNTING FOR CERTAIN CHARACTERISTICS OF THE LARGE, NIGHTTIME, PHASE AND AMPLITUDE FLUCTUATIONS OF VLF SIGNALS IN ARIZONA DURING SUMMER,

Corporate Author : NAVY ELECTRONICS LAB SAN DIEGO CALIF

Personal Author(s) : Gossard,E. E. ; Paulson,M. R.

Report Date : 23 AUG 1963

Pagination or Media Count : 37

Abstract : In an effort to find the cause of the wellknown abnormal nighttime fluctuations in the ionosphere D-region, vlf measurements were made over short paths in the southwestern United States. The data can be explained by postulating a model in which the base of a nighttime E-layer occurs at 100 km, with a ledge of electron density of about 180 electrons/milliliter extending downward to a height of 90-95 km. Horizontally moving perturbations of the boundry layer would then cause large phase and amplitude fluctuations. (Author)

Descriptors :   (*IONOSPHERE, ELECTROMAGNETIC PROPERTIES), (*ELECTRON DENSITY, MEASUREMENT), ELECTROMAGNETIC WAVE REFLECTIONS, VERY LOW FREQUENCY, ATMOSPHERE MODELS, DIPOLE ANTENNAS, POLARIZATION, MAGNETIC FIELDS, ANTENNA RADIATION PATTERNS, RADIO SIGNALS, PHASE MEASUREMENT, PERIODIC VARIATIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE