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Title: Phase & Amplitude Variations of 22·3 kHz Signal over Transequatorial Path of NWC Australia-New Delhi
Authors: Jain, S L
Subrahmanyam, C V
Issue Date: Dec-1977
Publisher: NISCAIR-CSIR, India
Abstract: Amplitude and phase of a vlf stabilized transmissions on 22·3 kHz from North West Cape, Australia are recorded at New Delhi over a transequatorial path, This path is particularly interesting as the reflection of the vlf signals takes place from the equatorial latitudes (mid-point latitude is 3·69° N). The diurnal variations of the amplitude and phase are described and the variation of reflection height has been computed from the phase records. The reflection heights during night and daytime are found to be 85-90 and 70 km, respectively. The experimental and theoretical electron density profiles have been used to compute the phase and reflection height variation with solar zenith angle and compared with those obtained in the present investigation, An interesting phenomenon of cycle slipping is observed around sunrise at the midpoint of the path, which is near the equator, This is explained in terms of modal interference pattern during sunrise transition.
Page(s): 261-264
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.06(4) [December 1977]

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