Time variations in the UV background
  We have found variations in the diffuse ultraviolet background on the scale
about 10 days over the 10 year life of the GALEX mission. These variations are
only apparent in the near-ultraviolet band of GALEX and are most likely related
to variations in the zodiacal light due to brightness variations of the solar
NUV flux. The variations can be as high as 200 photon units in the NUV,
amounting to about 15 % of the zodiacal light or < 10 % of the total NUV
diffuse radiation. There is no effect on the far-ultraviolet band of GALEX.
Further work will require better observations chosen specifically for the
purpose of investigating this component and will be difficult to obtain.
