Accession Number : AD0706635

Title :   D-REGION AERONOMICAL CHANGES DEDUCED FROM STEEP INCIDENCE SUNRISE VLF PROPAGATION DATA,

Corporate Author : LOWELL TECHNOLOGICAL INST RESEARCH FOUNDATION MASS

Personal Author(s) : Hayes,Daniel P. ; Sales,Gary S.

Report Date : 1970

Pagination or Media Count : 12

Abstract : Some 12 months of near vertical incidence, mid-latitude VLF data, spanning the period April 1965 through June 1966, have been reduced and analyzed. Analysis of seasonal variations in sky wave amplitude prior to ground sunrise is presented here. These amplitude changes are accounted for in terms of D-region aeronomy variations. It is shown that early morning changes in Lyman-alpha radiation, nitric oxide and atomic oxygen can explain these preground sunrise amplitude effects. (Author)

Descriptors :   (*IONOSPHERE, ELECTRON DENSITY), (*RADIO WAVES, IONOSPHERIC PROPAGATION), SOLAR RADIATION, TRANSMITTER RECEIVERS, NITROGEN OXIDES, OXYGEN, IONIZATION, ULTRAVIOLET RADIATION, SKY BRIGHTNESS, VERY LOW FREQUENCY, CANADA

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE