Journal ArticleDOI
Seasonal variations of equatorial spread-F
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In this paper, the authors investigated the growth rate of irregularities by the generalized collisional Rayleigh-Taylor (GRT) instability mechanism, including the gravitational and cross-field instability terms.Abstract:
. The occurrence of spread-F at Trivandrum (8.5°N, 77°E, dip 0.5°N) has been investigated on a seasonal basis in sunspot maximum and minimum years in terms of the growth rate of irregularities by the generalized collisional Rayleigh-Taylor (GRT) instability mechanism which includes the gravitational and cross-field instability terms. The occurrence statistics of spread-F at Trivandrum have been obtained using quarter hourly ionograms. The nocturnal variations of the growth rate of irregularities by the GRT mechanism have been estimated for different seasons in sunspot maximum and minimum years at Trivandrum using h'F values and vertical drift velocities obtained from ionograms. It is found that the seasonal variation of spread-F occurrence at Trivandrum can, in general, be accounted for on the basis of the GRT mechanism.read more
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Occurrence characteristics of plasma bubble derived from global ground‐based GPS receiver networks
TL;DR: In this article, the authors studied the physical characteristics of plasma bubble occurrence using ground-based GPS receiver networks from 2000 to 2006, and found that the occurrence was high and constant for a station whose height on the dip equator (HODE) was less than 700 km.
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Equatorial spread F/plasma bubble irregularities under storm time disturbance electric fields
TL;DR: In this paper, a comprehensive analysis and discussion of the processes of ESF development, suppression or disruption under different phases of a storm activity sequence is presented, and the consequences for ESF occurrence from undershielding and over-shielding penetration electric fields as well as from the disturbance winds and wind dynamo electric field occurring in different local time sectors of the night, as also the irregularity dynamics and longitude extension.
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On seeding equatorial spread F during solstices
TL;DR: In this paper, seasonal migration and latitudinal alignment of the inter-tropical convergence zone (ITCZ) with the magnetic dip equator is suggested as the missing source, and shown able to fill that void.
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On the occurrence of postmidnight equatorial F region irregularities during the June solstice
TL;DR: In this article, the GPS total electron content (TEC) fluctuations obtained from a global GPS network and spread F in ionograms from Jicamarca (283°E, 12°S, Dip 1°N) in the American longitude sector and Kwajalein (167°E and 9°N, Dip 4°N).
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On the plausible linkage of thermospheric meridional winds with the equatorial spread F
TL;DR: In this paper, some of the characteristic features of thermospheric meridional winds during equinoctial period, associated with equatorial spread F and their possible role in the triggering of ESF are presented through case studies of observational events under different geophysical conditions that essentially control the post-sunset F-layer height (h'F) rise.