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|Title:||Nature of Equatorial Spread-F Irregularities Derived from Spaced Fading Records at Thumba|
Rastogi, R G
|Abstract:||Spaced fading records of nighttime F-region echoes over Thumba are compared on spread-F days and non-spread-F days. The fading rate is considerably low on non- spread-F days. The daytime westward drift (or the eastward electric field) reversed about one hour later on spread-F days than on non-spread-F days. Diffraction patterns due to the irregularities associated with the spread-F are more closely field-aligned with higher elongation and smaller E-W size than those on non-spread-F days. It is suggested that the necessary condition for equatorial spread in the evening hours is the persistence of eastward electric field after the sunset for duration long enough to trigger the irregularities.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.07(5) [October 1978]|
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