Horizontal wind data in the mesosphere and lower thermosphere estimated from 
the meteor wind observation of the MU radar at Shigaraki (text 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 text file named 
W(year)(month)(day).(resolution).txt or W(year)(month).(resolution).txt. 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 1km and 60 minutes. The text file includes year, day 
of year, time (local time), height, zonal and meridional winds, standard deviations of zonal 
and meridional winds, number of meteors used for the weighted average of the horizontal wind 
and two internal values. 
  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-text.html


Data revision:

  Initial version was released on July 30, 2012. 

Text data format:

yydddhhmmhhh  u (m/s)  v (m/s)  sigma-u  sigma-v  N-of-m    int1     int2
9013817 0 81   -26.0     36.7     46.3     56.8     5.0    1675.7    11.2
9013817 0 82   -12.3     39.3     32.1     43.3     6.0     747.4    19.8
9013817 0 83   -17.9     19.9     20.6     26.5     5.0     203.1    17.7
9013817 0 88    48.2     22.6     62.4     62.6     5.0    1897.6    12.0
9013817 0 89    41.1     34.9     48.9     44.4     8.0    1372.7    28.4

              yy: year
             ddd: day of year
              hh: hour (local time = 9+UT for Japan)
              mm: minute
        hhh (km): height
      u, v (m/s): zonal and meridional winds 
sigma-u, v (m/s): standard deviations of zonal and meridional winds
          N-of-m: number of meteors used for the weighted average of the horizontal wind
            int1: internal check value
	    int2: internal check value
                  (The parameters "int1" and "int2" are not required for analysis 
                   of the wind data.)

Revision history:

30JUL2012  A. Shinbori  :  Updated metadata file.
30JUL2012  A. Shinbori  :  Initial version.