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|Title:||Study of Solar Flare Signatures on If Field Strength over Tashkent-Delhi Path|
|Authors:||Subrahmanyam, C. V.|
Sastri, J. Hanumath
Deshpande, S. D.
|Abstract:||Field strength data of If transmissions from Radio Tashkent (164 kHz) as received at Delhi over a period of six years (1963-68)have been examined for signatures of solar flare events (Sudden field anomaly: SFA). A study of the observed SFA patterns indicates that the solar flare signatures can be classified into six distinct types, viz. I, la, Ib, II III and IV. It is noticed that the trend of the monthly frequency of occurrence of type Ia - SFA signature bears resemblance to that of monthly total ozone content observed at the mid-point of the path. From simultaneous multi-frequency SCNA observations available for a couple of SFA events, it Is inferred that type la-SF A signature is due to a considerable lowering of the reflecting region while type I is due to a change in the electron density gradient at the bottom of tile D-region.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.03(2) [June 1974]|
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