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Title: A study on the zonal movements of ionospheric irregularities using two simultaneous geo-stationary satellite signals
Authors: Rao, P V S Rama
Rao, B V Ramana
Prasad, D S V V D
Issue Date: Apr-2000
Publisher: NISCAIR-CSIR, India
Abstract: The simultaneous recordings of the amplitude scintillations of VHF radio signals from two nearby geostationary satellites, FLEETSAT (73°E) and SIRIO (65°E), received at a low latitude station, Waltair (17.7°N, 83.3°E), have revealed systematic time-shifts in the onset and decay of the individual similar scintillation patches. A total of 143 individual similar patches identified in the simultaneous scintillation data recorded at 136 MHz and 244 MHz during a low solar activity period from September 1983 to August 1984 at Waltair are used to compute the velocity components and size of the irregularities. The sub-ionospheric points [SIRIO (16.9°N, 81.9°E) ; FLEETSAT(16.4°N, 82.6°E)] of the two ray-paths were separated by only about 80 km in the east-west (E-W) direction, in which distance the structure of the irregularities do not change much. The E-W drift of plasma irregularities thus computed from the onset time delays of these events revealed a drift velocity of 140 m/s in the early hours of night and decreasing to about 90 m/s during the later part of the night. Using the drift velocities and the corresponding patch durations, the sizes of the irregularities (cast-west extent) are computed and are found to vary from a minimum of 50 km to a maximum of 1000 km with most probable values ranging between 50 and 250 km, which compare well with the results reported earlier.
Page(s): 66-70
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.29(2) [April 2000]

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