Transequatorial V.H.F. Transmissions and Solar-Related Phenomena

Radio and ionospheric data are analysed to determine the influences of solargeophysical phenomena on transequatorial v.h.f. transmissions along a EuropeanSouthern African circuit. Results over six years show a close dependence on sunspot number. The observed correlation with sudden ionospheric distu...

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Veröffentlicht in:	Aust. J. Phys., v. 26, no. 6, pp. 797-804 v. 26, no. 6, pp. 797-804, 1973-12, Vol.26 (6), p.797-804
Hauptverfasser:	Heeran, MP, Carman, EH
Format:	Artikel
Sprache:	eng
Schlagworte:	EQUATOR IONOSPHERE- SUDDEN IONOSPHERIC DISTURBANCE MHZ RANGE 01-100 N58100 -Physics (Atmospheric)-Auroral & Ionospheric Phenomena RADIOWAVE RADIATION SEASONAL VARIATIONS SUNSPOTS- SUDDEN IONOSPHERIC DISTURBANCE WAVE PROPAGATION WIND
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Beschreibung
Zusammenfassung:	Radio and ionospheric data are analysed to determine the influences of solargeophysical phenomena on transequatorial v.h.f. transmissions along a EuropeanSouthern African circuit. Results over six years show a close dependence on sunspot number. The observed correlation with sudden ionospheric disturbances indicates periodic solar-dependent defocusing of transequatorial signals by the ionosphere, while the combined effects of neutral winds and the position of the magnetic equator appear to control the seasonal behaviour of the transmissions.
ISSN:	0004-9506
DOI:	10.1071/PH730797