Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsa44a..01b&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #SA44A-01
Astronomy and Astrophysics
Astronomy
2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2487 Wave Propagation (6934), 6954 Radio Astronomy
Scientific paper
The marked day-to-day variability of equatorial ionospheric irregularities (scale lengths of tens of m to hundreds of m) has been investigated by performing multi-frequency scintillation observations at specific locations by many investigators worldwide. In addition to such temporal variability, multi-satellite observations from one station reveal extreme spatial variability when a region with intense irregularities may remain separated from a benign region by only 500 km over an entire night. In this paper, we show that the GUVI sensor on the TIMED satellite can image the equatorial anomaly on a global scale and such images can be used to specify in space and time the scintillating and non-scintillating regions. We present a case study of GUVI images on two successive nights during an equinoctial period. On one night the equatorial anomaly was well-developed at all longitudes when the crests of the equatorial anomaly were widely separated in latitude. This indicated the presence of a strong zonal electric field at the magnetic equator, which is also a pre-requisite for the formation of ionospheric irregularities. It is shown that on this night scintillations were indeed observed at widely separated locations around the globe. The adjacent day showed the collapse of the equatorial anomaly over a wide longitude swath implying that irregularities are not likely to be formed in these regions. The scintillation observations at Calcutta, India and at Singapore located in this region indicate the absence of scintillation. The study reveals that the GUVI images of the equatorial anomaly can be used to specify scintillating and non-scintillating regions on a global scale.
Basu Sarbani
Christensen A.
Dasgupta Arup
Groves K.
Makela Jarmo
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