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

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

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Hayes,Daniel P, Sales,Gary S
Format: Report
Sprache:eng
Schlagworte:
Atmospheric Physics
CANADA
D REGION
ELECTRON DENSITY
IONIZATION
IONOSPHERE
IONOSPHERIC PROPAGATION
LYMAN ALPHA RADIATION
NITROGEN OXIDES
OXYGEN
RADIO WAVES
Radiofrequency Wave Propagation
SKY BRIGHTNESS
SOLAR RADIATION
SUNRISE
TRANSMITTER RECEIVERS
ULTRAVIOLET RADIATION
VERY LOW FREQUENCY
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Beschreibung
Zusammenfassung: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) Presented at the Conference on Meteorological and Chemical Factors in D-Region Aeronomy (3rd) Chicago, Ill., 23 Sep 68.