Solar Physics Division Meeting 2000, June 19-22 Session 13. Soft X-ray Luminosity and Photospheric Magnetic Field in Quiet Sun. We are using full disk soft X-ray data from Yohkoh and Kitt Peak daily magnetograms to study the coronal luminosity and photospheric magnetic field in the quiet Sun between 1991 November and 1998 December. For every image of our data set we extract three areas 4 by 4 solar degrees in size centered at 00N00W, 50N00W and 50S00W and compute X-ray luminosity and unsigned magnetic flux for each of these areas. A similar tendency is observed for our high latitude samples.
Similar variations are present in the total X-ray irradiance averaged over the solar disk.
On the contrary, the magnetic fluxes from the same areas of quiet Sun show no corresponding variations on this time scale. To further support this conclusion, we show one example of a dramatic change in X-ray luminosity over the entire visible corona that was associated with the emergence of a single small active region.