Simulating Vertical Profiles of Optical Turbulence at the Special Astrophysical Observatory Site.

Shikhovtsev, Artem Y.; Potanin, Sergey A.; Kopylov, Evgeniy A.; Qian, Xuan; Bolbasova, Lidia A; Panchuk, Asya V.; Kovadlo, Pavel G.

In this paper, we used meteorological data to simulate vertical profiles of optical turbulence at the Special Astrophysical Observatory (SAO) (Russia, 43°40′19″ N 41°26′23″ E, 2100 m a.s.l.), site of the 6 m Big Telescope Alt-azimuthal. For the first time, the vertical profiles of optical turbulence are calculated for the SAO using ERA-5 reanalysis data. These profiles are corrected using DIMM measurements as well as estimations of atmospheric boundary layer heights. We may note that the method basically reconstructs the most important features of the shape of the measured profile under clear sky. Atmospheric turbulent layers were identified, and the strength of optical turbulence in these layers was estimated. The model hourly values of seeing corresponding to the obtained vertical profiles range from 0.40 to 3.40 arc sec; the values of the isoplanatic angle vary in the range from 1.00 to 3.00 arc sec (at λ = 500 nm). The calculated median of seeing is close to 1.21 arc sec. These estimations are close to the measured median of seeing (1.21 arc sec).

ATMOSPHERIC boundary layer; ATMOSPHERIC layers; REFRACTIVE index; TURBULENCE; OPTICAL constants

Atmosphere, 2024, Vol 15, Issue 11, p1346

2073-4433

Academic Journal

10.3390/atmos15111346