IYEAR       i5       4-digit year
IDAY        i4       Day of year (IDAY=1 is January 1)
IHOUR       i3       UT hour (0 - 23)
MIN         i3       UT minute (0 - 59)
Xsm         f10.4    Re, a spacecraft X-position in SM coordinates
Ysm         f10.4    Re, a spacecraft Y-position in SM coordinates
Zsm         f10.4    Re, a spacecraft Z-position in SM coordinates
Tilt        f10.5    geodipole tilt angle (radians!) in GSW coordinate system
Bx          f9.1     nT, external field X-component in SM coordinates, 5-min average
By          f9.1     nT, external field Y-component in SM coordinates, 5-min average
Bz          f9.1     nT, external field Z-component in SM coordinates, 5-min average
Pdyn        f7.2     solar wind flow ram pressure, nPa
W1          f8.3     dynamical variable with the timescale T1=4 hour and B-index as the driving function (see Eq.(7))
W2          f8.3     dynamical variable with the timescale T1=20 hour and B-index as the driving function (see Eq.(7))
dW1/dt      f9.4     time derivative of W1
dW2/dt      f9.4     time derivative of W2
<By IMF>    f8.2     nT, in GSW coordinates, average over preceding 30-min trailing interval