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Title: Prompt Effects of Solar Flare Observed Simultaneously on the Radio Wave Propagation Characteristics in the LF, VLF & HF Bands
Authors: Sen, A. K.
Saha, B.
Trehan, S. K.
Chatterjee, S. K.
Issue Date: Jun-1974
Publisher: NISCAIR-CSIR, India
Abstract: Simultaneous observations of the field strength of If and hf signals and the integrated field intensity of vlf atmospherics made in Calcutta (lat., 22°34'N; long., 88°24'E) and that of the frequency deviation of a standard frequency hf signal made in the ionospheric field station at Haringhata (lat., 22°58'N; long., 88°30'E) revealed some interesting features of the association between the ionospheric effects of a solar flare, in the three frequency bands. The results indicate that a great majority of SIDs observed by SWF, SES and SEA methods are not associated with SFD phenomena and that an SFD tends to be associated with a relatively weak SID observed by the other methods. The observations suggest that the majority of flares producing a D-region effect are not accompanied by EUV emission sufficient for producing an SFD, while flares producing a large EUV emission are relatively weak emitters of X-rays responsible for a D-region effect.
Page(s): 140-141
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.03(2) [June 1974]

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