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Title: Equatorial Spread F & F-layer Height
Authors: Subrahmanyam, V
Rao, M Srirama
Issue Date: Jun-1978
Publisher: NISCAIR-CSIR, India
Abstract: From a study of h' Fvariations under non-spread F, short duration spread F, spread F with subsequent reappearance and long duration spread F conditions at Ibadan, Trivandrum and Singapore, the following conclusions have been drawn: (i) The onset of spread F does not necessarily associate always with either the marked rise or reversal of vertical upward movement of the layer (ii) there does not seem to be any threshold height for the occurrence of spread F and (iii) the significant height fluctuations do not always associate with long duration spread F only; consequently it appears that the fluctuating east-west electric field need not necessarily be a pre-requisite for the generation and sustenance of the irregularities. It is suggested that there could be more than one physical process which may cause instabilities in the F-region and produce irregularities that result in spread F.
Page(s): 166-170
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.07(3) [June 1978]

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