Since November 2004, site testing campaigns for a monitoring of the
vertical distribution of the optical turbulence are on-going at Mount
Graham with a Generalized SCIDAR (GS) on
the Vatican Advanced Technology Telescope (VATT).
Analysis of the optical turbulence
will be posted in this Web Page as they happen.

Measurements have been taken with a Generalized SCIDAR (D. Mc
Kenna), an optical
instrument that measures the scintillation maps produced by binary
stars on the pupil of the telescope (at least 1 m size). The optical
turbulence vertical distribution (C_{N}^{2}
profiles) is retrieved from the auto-correlation of
the scintillation maps. The binary stars have the following properties:
a
separation θ within the (3" - 14") range; m1, m2 ≤ 5.8 mag;
Delta(m)
≤ 1.5 mag. Wind speed vertical profiles can be retrieved from the
cross-correlation of
scintillation maps taken with a time lag of typically 20 - 40
msec.

Since May 2005 we are also running the GS in a new modified
configuration
suitable to obtain a high-vertical resolution (~ 25 m) C_{N}^{2}
profiles in
the first 600 m.

Below is the summary of the data analysis: the nightly
astroclimatic parameters (seeing and isoplanatic angle) and composite
turbulence profiles. We hope to progressively achieve
a useful database for as many as possible applications. It is,
indeed, our wish to support in the best way
LGS, GLAO and MCAO programs on-going at LBT. Readers can find some
complementary outputs also in scientific publications.

Please read carefully the Policy for data usage.

- 25/11/2004 - 28/11/2004

- 04/12/2004

- 27/04/2005

- 20/5/2005 - 27/5/2005

- 07/12/2005 - 11/12/2005

- 14/12/2005 - 15/12/2005

- 28/05/2007 - 04/06/2007

- 15/10/2007 - 28/10/2007

Next run: 21/2/2008 - 3/3/2008

Nightly seeing and isoplanatic angle statistics:

A graphical representation of the above nightly statistics:

Seeing related to all data-sets Isoplanatic angle related to all data-sets

Caption: dashed line: median for the whole data set; dotted line: 1st and 3rd quartiles

Composite Profiles - Inputs for AO Simulations (LGS/GLAO system)

Standard GS data reduction

Legenda: The three groups of discretized profiles represent the good, typical and bad components of the GL and FA. The atmosphere is divided in 9 vertical slabs i. The boundaries of the vertical slabs are: [-1000,1000,2000,4000,6000,8000,10000,12000,14000,22000] [m].

- The factor Ji is the integral of the C

to convert J to: r0 in [m] at 0.5 microns = 5.07e-9 * J^(-3./5)

to convert J to: e0 in ["] at 0.5 microns = 1.99e+7 * J^(3./5)

- In the first column, h* [m] is the average height calculated as: h* = Integral[ hxCn2xdh] / Integral[Cn2xdh]

"Good": The mean of the C

"Typical": The mean of the C

"Bad": The mean of the C

ALL data sets - Average discretized vertical turbulence distribution

Summer [March-August] - Average discretized vertical turbulence distribution

Winter [September-February] - Average discretized vertical turbulence distribution

Data reduced and treated by Jeff Stoesz

E.Masciadri, 1/2008