TY  - JOUR
AU  - E. Aristidi, A. Agabi
PY  - 2020//
TI  - Dome C coherence time statistics from DIMM data
KW  - Astrophysics – Instrumentation and Methods for Astrophysics
N2  - We present a reanalysis of several years of DIMM data at the site of Dome C, Antarctica, to provide measurements of the coherence time $\tau_0$. Statistics and seasonal behaviour of $\tau_0$ are given at two heights above the ground, 3m and 8m, for the wavelength $\lambda=500$nm. We found an annual median value of $2.9$ms at the height of 8m. A few measurements could also be obtained at the height of 20m and give a median value of 6ms during the period June--September. For the first time, we provide measurements of $\tau_0$ in daytime during the summer, which appears to show the same time dependence as the seeing with a sharp maximum at 5pm local time. Exceptional values of $\tau_0$ above 10ms are met at this particular moment. The continuous slow variations of turbulence conditions during the day offers a natural test bed for a solar adaptive optics system.
SN  - 0035-8711, 1365-2966
SN  - 0035-8711, 1365-2966
UR  - http://dx.doi.org/10.1093/mnras/staa1862
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=7825), last updated on Sun, 19 May 2024 21:42:22 +0200
ID  - E.Aristidi2020
ER  -