Horizontal wind data in the mesosphere and lower thermosphere estimated from the meteor wind observation of the MU radar at Shigaraki (netCDF format) Notes: 1. During three periods (2000/10/20-26, 2001/3/23-4/1, and 2001/7/8-15), the MU radar was operated in alternate meteor and ionosphere observation modes, with 30 minutes for meteor mode and 1 hour for ionosphere mode. Therefore, the number of meteors becomes apparently smaller, compared to that of regular meteor wind observations, and it varies with time. For example, the number of meteors of 'min00' data changes discontinuously at 3n+1(n = 0, 1, 2,...7) hours in all heights. 2. The wind data in 2004 are not available due to the problem of the MU radar interferometer. Description: The horizontal wind data in the mesosphere and lower thermosphere (70-110 km) estimated from the meteor wind observation of the MU rdar at Shigaraki MU Observatory in Shiga Prefecture, Japan (34.86N, 136.11E, 385m MSL). The wind data are calculated from the original observation data with a weighting function. They are stored in the netCDF (network Common Data Form) file named W(year)(month)(day).(resolution).nc or W(year)(month).(resolution).nc. The resolution abbreviations are h1t60min00, h1t60min30, h2t60min00 and h2t60min30. For example, the h1t60 means weighted average with Gaussian factors over +/-1 km in height and +/-60 minutes in time. The min00 shows that the center of the Gaussian window corresponds to 00 minute of every hour. The intervals of the wind data are every 1 km and 60 minutes. The netCDF file includes time, height, zonal and meridional winds, standard deviations of zonal and meridional winds, and number of meteors used for the weighted average of the horizontal wind. If you want to know more information of this data, please access the metadata URL. Link to Metadata: http://www.rish.kyoto-u.ac.jp/mu/meteor/to_meta/mur-meteor-netcdf.html Data revision: Initial version was released on July 30, 2012. Revision history: 30JUL2012 A. Shinbori : Updated metadata file. 30JUL2012 A. Shinbori : Initial version.