抄録
The Telescope Array (TA) project focuses on Ultra-High Energy Cosmic Ray (UHECR) observations.
TA observes the fluorescence of nitrogen excited by secondary cosmic rays with a telescope (fluorescence
detector: FD). The influence of atmospheric transparency in the propagation process must be considered
from the point of its occurrence to FD when analyzing cosmic rays. A bistatic-LIDAR facility was constructed
for TA experiments to estimate the inhibition of fluorescence propagation by aerosols. This facility
is called the Central Laser Facility (CLF). In this paper, we discuss the relative analysis method of
bistatic-LIDAR. The optical thickness of aerosol by this analysis method can be obtained by the numerical
value (VAOD) integrated up to an arbitrary surface altitude in the vertical direction. Following previous
research, this paper records VAOD up to an altitude of 5 km, and the median and distribution
widths in 2015 were 0.042+0.031
−0.014 . We also compared our result with Mie-LIDAR from another year (a
previous experiment) and confirmed that the values are consistent.
