ASCII table providing soft x-ray irradiance in 4 bands 
(.2-.8, .8-2, 2-3, .1-3 nm) in units of W/m^2.  

Description:  The following table are the soft x-ray irradiance at
   the top of the earth atmosphere in the indicated bands.  These
   are daily averages derived from the Yohkoh Soft X-ray Telescope
   images as described in

   "Deriving solar X ray irradiance from Yohkoh observations",
    Acton, L. W., Weston, D. C. and Bruner, M. E., J. Geophys.
     Res., vol. 104, pp. 14,827-14,832 (1999).

   In this case, the temperature used to convert instrumental
   units to physical units was derived for each day from the
   signal ratio of the 2 thinnest (Al and AlMg) SXT filters.
        These irradiances have not been screened for obviously
   incorrect values.  Minor changes are to be expected as we
   finish work on the Yohkoh Legacy data Archive (YLA),
   http://solar.physics.montana.edu/ylegacy.  You will note that
   some days are missing.  Also, data coverage is much better for
   some days than others for the averaging process.  If this
   information is ever needed it can be supplied.
        The most unreliable channel is the 2-3 nm channel as
   this extends beyond the range of good SXT sensitivity.  For
   times of hgh coronal temperature this channel may well give 
   an irradiance somewhat smaller than actual.
        Please note that during solar flares the full-sun images
   used to compute these irradiances were not acquired.  Thus,
   they reflect primarily the so-called "quiet sun" irradiance.
        Units of the table are watts per square meter.