statistical vertical turbulence profiles at the canary...

Alghero, Sardegna ___ September 2008Optical Turbulence: Astronomy meets Meteorology

B. García-Lorenzo1, J.J. Fuensalida1, J. Castro-Almazán1, & M.A.C. Rodríguez-Hernández1

(1) Instituto de Astrofísica de Canarias

www.otri.iac.es/sitesting/principalwww.otri.iac.es/sitesting/principalwww.iac.es/project/gare

Statistical Vertical Turbulence Profiles at Statistical Vertical Turbulence Profiles at the Canary Islands Astronomical Sitesthe Canary Islands Astronomical Sites

Cute-SCIDAR Instrument at Jacobus Kapteyn

Telescope (ORM)

SH-SCIDAR Instrument at Carlos Sánchez

Telescope (OT)


Teide ObservatoryTeide ObservatoryTeide Observatory

Roque de los MuchachosRoque de los MuchachosRoque de los MuchachosObservatoryObservatoryObservatory

~160 km~160 km~160 km


Characterization of the vertical atmospheric structure Characterization of the vertical atmospheric structure with statistical significance for MCAO in ELT:with statistical significance for MCAO in ELT:

⇒ To develop instruments with common user facilities, e.g.:Cute-SCIDAR for Paranal (Vázquez-Ramió et al. 2008, SPIE, 7012, 161)Hybrid Shack-Hartmann/G-SCIDAR for Teide observatory (Rodríguez-Hernández et al. 2007, SPIE, 6747, 28)Cute-SCIDAR- for La Palma (Fuensalida et al. 2004, INGN, 8, 1)

⇒ To develop new software in order to simplify and to speed up the data reduction in real time

Dome seeing correction (Fuensalida, García-Lorenzo & Hoegemann 2008, MNRAS, tmp897)

Wind profiling with wavelet analysis (García-Lorenzo & Fuensalida 2006, MNRAS, 372, 1483)

⇒ Wind statistical results with meteorological archivesV0 versus V200 (García-Lorenzo et al. 2008, this conference)

Site ranking based on tropospheric wind statistics (García-Lorenzo et al. 2005, MNRAS, 356, 849)

Statistics of V200 at the Canary Islands (Chueca et al. 2004, MNRAS, 349, 627)

⇒ Statistics of CN2 profiles

OT since 2002 (e.g. García-Lorenzo, Fuensalida & Rodríguez-Hernández 2007, SPIE, 6747, 11)

ORM since 2004 (e.g. Fuensalida et al. 2007, RMxAC, 31, 86)


Translation stage in theoptical axis for changing theconjugated plane and forsetting purposes.

Translation stages XY axisfor adjusting the CCD tooptical axis.

Electronic diaphragm foralignment purposes.

Graphical interface thatshows a partialautocorrelation in Real Time.

All images are saved.

It is installed at the 1mJKT (ORM)

Operated from the 1mJKT control room.

Rotation.

It is based on the original Generalized-SCIDAR to be used systematically

*Sampling rate= 1-3 ms *Integration time= 2 s *Frame size=256x256 pix with several binning

CuteCute--SCIDAR instrumentSCIDAR instrument


G-SCIDAR + Shack-Hartmann capable of running simultaneously

Contron in the two branches

All images are saved.

It is installed at the 1.5mTCS (OT)

Operated from the 1.5mTCS control room.

Rotation and Translation

GG--SCIDAR+ShackSCIDAR+Shack--Hartmann instrumentHartmann instrument

Shack-Hartmann sensor:* Andor

Camera: Electron Multiplying* CCD detector based on E2V CCD 60.* 128 x 128 pixels, 24x24 µm pixels siz* Three axis translations stages.* Lenslet

array: 34 mm focal length and 312.5 μm

pitch.* 50 mm collimator lens.* Electronic diaphragm for alignment purposes.

Shack-Hartmann sensor:* Andor

Camera: Electron Multiplying* CCD detector based on E2V CCD 60.* 128 x 128 pixels, 24x24 µm pixels siz* Three axis translations stages.* Lenslet

array: 34 mm focal length and 312.5 μm

pitch.* 50 mm collimator lens.* Electronic diaphragm for alignment purposes.


Monitoring of the turbulence structure at ORM and OTMonitoring of the turbulence structure at ORM and OT

⇒ The systematic monitoring began in February 2004

⇒ Frequency: 7-4-8 nights every month

⇒ Data for >165 nights

ORM (La Palma)⇒ The systematic monitoring began in Nov 2002 / July 2005

⇒ Frequency: ~4-6 nights every month

⇒ Data for >140 nights

OT (Tenerife)


Evolution of CEvolution of CNN

22(h) along a night(h) along a night

2006/05/26 ORM

1 2 3 4Universal Time

0

5

10

15

20

25

Alti

tude

abo

ve s

ea le

vel (

km)

2006/05/26 ORM


0

5

10

15

20

25

Alti

tude

abo

ve s

ea le

vel (

km)

-18.5

-18.1

-17.7

-17.3

-16.9

-16.5

-16.1

-15.7

-15.3

-14.9

-14.5

Log

(CN

2 (m

-2/3))

2006/05/26 OT


0

5

10

15

20

25

Alti

tude

abo

ve s

ea le

vel (

km)

2006/05/26 OT


0

5

10

15

20

25

Alti

tude

abo

ve s

ea le

vel (

km)

-18.0

-17.7

-17.4

-17.1

-16.8

-16.5

-16.2

-15.9

-15.6

-15.3

-15.0

Log

(CN

2 (m

-2/3))


Statistical coverage of profiles at the ORMStatistical coverage of profiles at the ORM

Jan04 Feb04 Mar04 Apr04 May04 Jun04 Jul04 Aug04 Sep04 Oct04 Nov04 Dec04

--- 3 6 8 6 5 7 7 9 2 4 4

--- 2323 5942 9586 5953 5702 7530 8186 8867 1260 3847 3191


7 1 3 4 4 7 4 3 3 3 2 2

10451 381 1218 4692 4061 5392 4372 1357 1791 3292 1084 2170


2 2 2 3 4 --- 3 2 1 1 --- ---

2459 2912 1640 2710 4363 --- 3203 1933 1329 275 --- ---


--- --- --- --- --- --- --- --- --- --- --- ---

--- --- --- --- --- --- --- --- --- --- --- ---


4 1 5 2 3 6 5 7

2860 961 4426 671 3200 6433 3208


Monthly statistical Monthly statistical behaviourbehaviour

of Cof CNN

22(h) at the ORM(h) at the ORM


Statistical coverage of profiles at the OTStatistical coverage of profiles at the OT


--- 1 2 3 4 --- 2 3 5 3 --- ---

--- 1142 1281 2451 2507 --- 1493 876 3064 1454 --- ---


1 --- 3 3 5 4 4 7 7 2 --- ---

467 --- 680 1865 4389 2496 1622 4785 4793 1203 --- ---


1 2 3 4 3 4 3 5 2 --- --- 1

103 1113 2151 2703 1669 2945 1379 3339 1765 --- --- 766


--- --- 6 6 --- --- --- 3 3 --- --- ---

--- --- 3483 3259 --- --- --- 2014 2186 --- --- ---


--- 1 --- 4 --- 4 --- 4

--- 381 --- 3160 --- 2341 ---


--- 2 --- 1 3 2 2 8 2 --- --- ---

--- 635 --- 308 1507 797 1342 5254 1448 --- --- ---

Nov02 Dec02

1 4

593 4201


Monthly statistical Monthly statistical behaviourbehaviour

of Cof CNN

22(h) at the OT(h) at the OT


Comparison of the statistical CComparison of the statistical CNN

22(h) at the OT and ORM(h) at the OT and ORM

Teide ObservatoryTeide ObservatoryTeide Observatory

Roque de los MuchachosRoque de los MuchachosRoque de los MuchachosObservatoryObservatoryObservatory

~160 km~160 km~160 km


Comparison of the statistical CComparison of the statistical CNN

22(h) at the OT and ORM(h) at the OT and ORM


Definition of parameters for adaptive opticsDefinition of parameters for adaptive optics

5/3)(21)(cos7.16

02

−

⎟⎟⎠

⎞⎜⎜⎝

⎛∫

−=

∞dhhNCro λ

γ FriedFried’’ss parameterparameterOptimal number of sub-aperturesto evaluate the wave-front

5/3

2

0

3/52

)(

)()(31.0

⎥⎥⎥⎥

⎦

⎤

⎢⎢⎢⎢

⎣

⎡

∫

∫

=Γ

∞

∞

oN

N

oo

dhhC

dhhVhC

rCoherenceCoherence timetimeFrequency of evaluation

5/3

0

3/521

)()(cos9.114−

∞−

⎥⎥⎦

⎤

⎢⎢⎣

⎡∫= dhhhC No λ

γθIsoplanaticIsoplanatic angleangle

FoV

corrected


Statistical Statistical behaviourbehaviour

of of isoplanaticisoplanatic

angleangle

<AO>OT

= 2.68 +/-

1.34 <AO>ORM

= 2.01 +/-

0.97


Application to an astronomical instrument: Application to an astronomical instrument: EDiFiSEEDiFiSE

EDiFiSE: Equalized and Diffraction-limited Field Spectrograph ExperimentPrototype instrument for the observation of high-contrasted objects

García-Lorenzo et al. 2008, SPIE, 7014, in press

AO+

fiber-coupled lens array+

EIFS


B. García-Lorenzo1, J.J. Fuensalida1, J. Castro-Almazán1, & M.A.C. Rodríguez-Hernández1

(1) Instituto de Astrofísica de Canarias

www.otri.iac.es/sitesting/principalwww.otri.iac.es/sitesting/principalwww.iac.es/project/gare

Statistical Vertical Turbulence Profiles at Statistical Vertical Turbulence Profiles at the Canary Islands Astronomical Sitesthe Canary Islands Astronomical Sites

Cute-SCIDAR Instrument at Jacobus Kapteyn

Telescope (ORM)

SH-SCIDAR Instrument at Carlos Sánchez

Telescope (OT)

statistical vertical turbulence profiles at the canary...

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