Ion drift velocity data in the ionosphere derived from incoherent scatter measurements with the MU radar (Initial analysis version: text, netCDF and png format) Description: The 1-hour average observation data of ion drift velocity in the ionosphere (220--450km) taken by the MU radar at Shigaraki in Shiga Prefecture, Japan (34.86N, 136.11E, 385m MSL), which has been operated in the incoherent scatter observation mode. Data and file name: Text: (YYYYMMdd)_drift.txt NetCDF: (YYYYMMdd)_drift.nc PNG: (YYYYMMdd)_drift.png Details are described in the metadata (text, netcdf and png). Data format (text data) YYYY MM dd hh dv1 dv2 dv3 dv4 dv5 dv6 dv7@@dv8 dv9@ 2012 3 15 0 -2.8 42.5 54.6 51.9 86.4 -13.2 19.1 -11.5 21.0 2012 3 15 1 -61.0 78.5 12.5 46.1 74.0 0.1 -12.4 -35.6 29.3 2012 3 15 2 -62.8 59.3 6.1 23.2 62.4 -25.1 -23.9 -53.5 19.1 2012 3 15 3 -55.6 114.1 -34.1 27.1 67.3 1.8 -16.8 -73.0 21.2 2012 3 15 4 -60.3 75.4 -2.1 33.9 59.7 -9.0 -25.6 -49.4 15.7 YYYY: Year MM: Month dd: Day hh: Hour(0-23) dv1--dv9: Ion Drift Velocity (m/s) dv1: Eastward direction perpendicular to the magnetic field line dv2: Northward/upward direction perpendicular to the magnetic field line dv3: Southward/upward direction parallel to the magnetic field line dv4: Vertical direction calculated from northward and southward beams dv5: Vertical direction calculated from eastward and westward beams dv6: Beam 1 direction (az, ze) = (355, 20) dv7: Beam 2 direction = ( 85, 20) dv8: Beam 3 direction = (175, 20) dv9: Beam 4 direction = (265, 20) Data revision: Initial version was released on October 15, 2012. Revision history: 15OCT2012 : Updated metadata file. 15OCT2012 : Initial version for numerical data. Updated PNG data.