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DC Field | Value | Language |
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dc.contributor.author | Kishore, P. | |
dc.contributor.author | Namboothiri, S.P. | |
dc.contributor.author | Igarashi, K. | |
dc.contributor.author | Gurubaran, S. | |
dc.contributor.author | Sridharan, S. | |
dc.contributor.author | Rajaram, R. | |
dc.contributor.author | Ratnam, M. Venkat | |
dc.date.accessioned | 2015-08-27T06:42:06Z | |
dc.date.accessioned | 2021-02-12T09:27:37Z | - |
dc.date.available | 2015-08-27T06:42:06Z | |
dc.date.available | 2021-02-12T09:27:37Z | - |
dc.date.issued | 2004 | |
dc.identifier.citation | JASTP, v.66/6-9, p.507-515, 2004, doi: 10.1016/j.jastp.2004.01.026 | en_US |
dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/293 | - |
dc.description.abstract | Wind measurements made during January 1995 through December 1997 using Partial Reflection Radar located at Tirunelveli (8.7°N, 77.8°E), a tropical station in India, have been used to monitor the long-period planetary wave activity in mesosphere and lower thermosphere. Lomb-scargle periodogram analysis and wavelet techniques are used to study the temporal development of these oscillations and their vertical structure. The observed amplitude and power spectrum show a broad peak near 5–7 days, which corresponds to 6.5-day wave reported earlier. The 6.5-day wave is observed to be an equinoctial phenomenon when background wind is westward, being strong during April/May and September/October months. This shows possible effect of semi annual oscillation on this wave. The 6.5-day oscillation is particularly strong in the zonal wind component, and seems to be present almost continuously in the 84–Full-size image (<1 K) height region. The wave activity is found to maximize during the weak-quasi biennial oscillation year. However, this observed feature need to be examined with a much longer dataset and we have initiated some efforts towards this direction. Mean climatology of these variations observed during three years (1995–1997) has been presented and found that there exists a strong interannual variability. The observed wave activity and its possible source mechanisms are compared and discussed with the available literature. | en_US |
dc.language.iso | en | en_US |
dc.subject | Equatorial dynamics | en_US |
dc.subject | Planetary waves | en_US |
dc.subject | Nonlinear interaction | en_US |
dc.subject | Mesosphere | en_US |
dc.subject | MF radar | en_US |
dc.subject | Equatorial mesosphere | en_US |
dc.title | MF radar observations of 6.5-day wave in the equatorial mesosphere and lower thermosphere | en_US |
dc.type | Article | en_US |
dc.identifier.accession | 090782 | |
Appears in Collections: | UAS_Reprints |
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File | Description | Size | Format | |
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GurubaranS_RajaramM_JASTP_2004.pdf Restricted Access | 864.86 kB | Adobe PDF | View/Open Request a copy |
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