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Title: Meridional wind derived from HF doppler radar and ionosonde over the magnetic equator
Authors: Nayar, S R Prabhakaran
Bhuvanendran, C
Jyoti, N
Devasia, C V
Subbarao, K S V
Keywords: HF doppler radar;Doppler radar;Radar;Ionosonde;F-region;Magnetic equator
Issue Date: Dec-2004
Publisher: NISCAIR-CSIR, India
IPC Code: G 01 S 1/38
PACS No.: 94.20. Ji : 84.40 Xb
Abstract: The nature of plasma motion in the F-region at the magnetic equator is such that they are driven by the neutral air wind along the geomagnetic field. The meridional wind at the equatorial F-region is evaluated using HF Doppler radar of the Kerala University. Trivandrum (8.6° N, 77° E, dip 0.5° N) operated in spaced receiver configuration and ionosonde at equatorial station Trivandrum and an off-equatorial station Sriharikota (SHAR. 13.7° N, 80.2 °E, dip 10° N) for a few days during 1994- 1995. The meridional component of the plasma drift at the magnetic equator is determined from the HF Doppler radar data by finding the time delay between the signals received at the central and north antennae by cross-correlation method. The thermospheric meridional wind is also determined by using hʹF values obtained from the ionograms of both Trivandrum and Sriharikota. The temporal variation of meridional wind at the magnetic equator as determined by using both the HF Doppler and ionosonde methods show similar pattern. These results are compared with that obtained using HWM93. It was found that the magnitude of the poleward wind and its time of reversal depend on the altitude of the ionospheric layer.
Page(s): 367-372
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.33(6) [December 2004]

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