Variation in the 160.010 m period of the solar relative difference brightness

This paper reports on the measured results of the difference brightness of the center of the Sun with respect to the limb of the solar disk in 1986, with the wavebands 0.7—0.8 μm being used. Two photoelectric diode arrays (with 16×16, 32×32 pixels) are respectivetlyused as detectors. The data obtained and their power spectra are independently calculated. Results show clearly the period changing in 160m and the average amplitude being 8×10~(-5) solar relative intensity units.The periodic values of the difference brightness observed for 358 days (or 1870 h) from 1976 to 1986 at the Crimean Astrophysical Observatory are also analysed. The results show that the accurate value of the oscillation period is 160_.~m0099 (±16) and the statistically effective value is above 3σ~2. This value is in good agreement with the infrared observed value of 160_.~m0100 (±6) and the observed value of 160_.~m010(±1) obtained at the Doppler difference velocity.