Solar irradiance measurements with the DIFOS-photometer aboard the sat
ellite CORONAS-I were compared with short term variations of solar act
ivity. The sunspot blocking effect was confirmed and an anticorrelatio
n with the 2600 MHz radio flux is very pronounced. Furthermore a close
relation to the large scale structure of the magnetic field existed d
uring the observational period from 1994, March 16 to May 7.