OSA-ESO ADAPTIVE OPTICS TOPICAL MEETING, OCT95, Ed. M. Cullum

PARSCA: Results from balloon borne measurements (A. Fuchs, PHD Thesis, Nice University, April 1995)

Here is a brief summary of the balloon borne measurements at Paranal:

Flight
(UT)		L0
(m)		R0
(cm) 		ThAO
(")		ThSI
(") 		TauAO
(ms)		TauSI
(ms) 		Vmax
(m/s)		V0
(m/s)		H2O
(mm)

09/3/92 3h30
10/3/92 3h30
11/3/92 4h45
12/3/92 1h30
14/3/92 3h30
15/3/92 1h00
15/3/92 5h00
16/3/92 4h10
24/3/92 8h12
25/3/92 2h43
25/3/92 7h11
29/3/92 4h10
29/3/92 9h15
TOTAL

1.55
1.18
4.10
2.38
6.76
2.09
1.70
2.11
2.40
2.51
1.30
1.48
1.92

26.5
29.3
12.1
17.2
6.7
18.5
21.7
13.7
12.1
18.1
15.9
16.1
10.9
16.8

3.0
3.8
4.1
3.5
0.4
2.0
1.7
2.5
1.6
2.0
2.2
2.8
1.7
2.4

4.1
4.8
4.3
3.8
0.8
2.9
3.2
2.7
2.1
2.6
2.5
3.2
1.9
3.0

-
-
10.9
14.5
1.2
5.2
3.4
7.9
3.9
3.3
3.5
4.9
3.3
5.6

-
-
14.8
20.5
2.2
7.4
6.2
13.3
4.9
5.8
6.3
17.7
11.6
10.1

-
-
28
18
42
48
55
25
43
45
58
20
18
36

-
-
3.9
4.2
18.0
11.1
19.7
6.6
10.0
22.1
16.8
11.1
9.8
12.1

1.9
2.9
2.9
2.5
4.3
5.5
4.3
3.7
3.4
1.6
3.4
4.9
5.0
3.6


Meaning of parameters:
L0: outer scale of turbulence (using Coulman Vernin Model)
R0: Fried Parameter
ThAO: Isoplanatic angle for Adaptive Optics
ThSI: Isoplanatic angle for Interferometry
TauAO: Coherence time for Adaptive Optics
TauSI: Coherence Time for Interferometry
Vmax: Maximum wind velocity (in the troposphere)
V0: Average wavefront Velocity (frozen Atmosphere)
H2O: precipitable water vapour content

PARSCA (PARanal Seeing CAmpaign) is a collaboration between ESO and the Department of Astrophysics of Nice University.