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Title: Nature of Equatorial Spread-F Irregularities Derived from Spaced Fading Records at Thumba
Authors: Chandra, H
Rastogi, R G
Issue Date: Oct-1978
Publisher: NISCAIR-CSIR, India
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.
Page(s): 266-268
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.07(5) [October 1978]

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