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|Title:||Characteristics of Travelling Ionospheric Disturbances over Thumba|
|Authors:||Nagpal, O P|
|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.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.06(3) [September 1977]|
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