Astroclimatology of Paranal

Monthly Statistics (99-02) Tau0 vs. Hbar Annual Statistics ( 2005 2004 2003 2002 2001 2000 1999 )

Tau0 at Paranal: Annual Statistics

Coherence Time statistics 1999-2003 (10mn averages, 535000 samples)

Photometric Nighttime (23h-10hUT)	median (ms)	tau0 > 3ms (%)
January	4.4	77
February	5.2	86
March	4.5	78
April	3.8	66
May	2.9	47
June	2.5	39
July	2.8	44
August	2.9	46
September	2.4	33
October	3.0	49
November	3.0	50
December	3.2	56
Year	3.3	56

Relation of tau0 to the turbulence characteristic altitude (km above the site)

Statistics 2005 (10mn averages)

Statistics 2004 (10mn averages)

Statistics 2003 (10mn averages)

Statistics 2002 (10mn averages)

Statistics 2001 (10mn averages)

Statistics 2000 (10mn averages)

Statistics 1999 (10mn averages)