Research on Cosmic Rays in Lunar-based Ultraviolet Telescope Images during Eclipse of September 28, 2015

On September 28, 2015, the Lunar-based Ultraviolet Telescope (LUT) experienced the only complete lunar eclipse during its mission, which provided a rare opportunity to study whether the Earth's geometric shielding of sunlight would affect the lunar radiation environment. Firstly, the count of cosmic rays in CCD astronomical images that lasted for 2 hours and 27 minutes during the eclipse was statistically analyzed, and it was found that there was no significant change. Within the 30 second exposure time, the average count of cosmic rays is 129.27(±15.78). Secondly, the count of cosmic rays in dark field images collected in August and October to December were analyzed, which were 119.92(±6.37), 117.00(±10.90), 118.61(±8.94), 123.90(±8.92). Within 1σ error, it is consistent with the count of cosmic rays during the eclipse, indicating that the Earth's geometric shielding of the sun has no significant effect on the moon's radiation environment. Finally, the above results were analyzed and discussed.