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Title: Characteristics of Travelling Ionospheric Disturbances over Thumba
Authors: Nagpal, O P
Issue Date: Sep-1977
Publisher: NISCAIR-CSIR, India
Abstract: Characteristics of wavelike perturbations in the daytime F-region electron density are deduced from the 15-min ionograms obtained from the vertical incidence ionosonde over Thumba, an equatorial station. For periods ranging from 30 min to 3 hr occurrence, peaks in the distribution are observed between 30 and 90 min. The amplitudes of electron density fluctuations are estimated to be in the range 2.0-8.0 %, which are comparatively smaller when compared to those observed at mid-dip latitude stations. This has been attributed to the way these waves manifest themselves in an anisotropic ionosphere. The iso¬∑ionic contours of h' as a function of time yields the vertical component of the wave velocity which is consistent with the gravity wave theory.
Page(s): 180-183
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.06(3) [September 1977]

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