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Title: | Simultaneous radar observations of meter-scale F region irregularities at and off the magnetic equator over India |
Authors: | Patra, A.K. Tiwari, D. Sripathi, S. Rao, P.B. Sridharan, R. Devasia, C.V. Viswanathan, K.S. Subbarao, K.S.V. Sekar, R. Kherani, E.A. |
Keywords: | F region irregularities Magnetic equator Equatorial F region Magnetic field Radar observations |
Issue Date: | 2005 |
Citation: | Journal of Geophysical Research, v.110/A2, 2005, doi: 10.1029/2004JA010565 |
Abstract: | [1] Simultaneous observations of equatorial spread F irregularities made with an 18 MHz radar from Trivandrum, located at the geomagnetic equator, and a 53 MHz radar from Gadanki, located at a magnetic latitude of 6.5°N, corresponding to nearly the same longitude zone, are presented. The observations correspond to 8.3 and 2.8 m irregularities, respectively. The spread F irregularities at both the locations are found to occur nearly at the same time but are observed for longer duration at Gadanki than at Trivandrum. The spread F structures as observed in the intensity maps corresponding to Gadanki are characterized by multiple periodic plumes in contrast to a limited number of plumes observed over Trivandrum. The Doppler velocities associated with these irregularities corresponding to Trivandrum are in the range of −100–150 m s−1, whereas they are in the range of −100–250 m s−1 at Gadanki. Further, the fluctuating velocity fields are much stronger in the Gadanki observations than in the Trivandrum observations. Remarkably, the spectral widths are <100 m s−1 in Trivandrum observations in contrast to those observed at Gadanki with values as high as 300 m s−1. The observations are compared with those made elsewhere and are discussed in the light of current understanding of the meter-scale irregularities responsible for the radar backscatter. |
URI: | http://localhost:8080/xmlui/handle/123456789/300 |
Appears in Collections: | UAS_Reprints |
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File | Description | Size | Format | |
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SripathiS_etal_JGR_2005.pdf | 524.88 kB | Adobe PDF | View/Open |
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