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Two nearly identical meteor radars were operated at Koto Tabang\ud(0.20° S, 100.32° E), West Sumatra, and Biak (1.17° S,\ud136.10° E), West Papua, in Indonesia, separated by approximately\ud4000 km in longitude on the Equator. The zonal and meridional momentum flux,\udu′w′ and v′w′, where u, v, and w are the eastward, northward, and vertical wind\udvelocity components, respectively, were estimated at 86 to 94 km altitudes\udusing the meteor radar data by applying a method proposed by Hocking (2005).\udThe observed u′w′ at the two sites agreed reasonably well at 86, 90, and 94 km\udduring the observation periods when the data acquisition rate was\udsufficiently large enough. Variations in v′w′ were consistent between 86,\ud90, and 94 km altitudes at both sites. The climatological variation in the\udmonthly averaged u′w′ and v′w′ was investigated using the long-term radar data\udat Koto Tabang from November 2002 to November 2013. The seasonal variations\udin u′w′ and v′w′ showed a repeatable semiannual and annual cycles, respectively.\udu′w′ showed eastward values in February–April and July–September and v′w′ was\udnorthward in June to August at 90–94 km, both of which were generally anti-phase\udwith the mean zonal and meridional winds, having the same periodicity. Our\udresults suggest the usefulness of the Hocking method

Measurement of momentum flux using two meteor radars in Indonesia