Mauna Kea VLBA Site Data

In 1995 and 1996, a 225 GHz tipping radiometer, which measures atmospheric transparency and temporal emission fluctuations, and a 12 GHz interferometer, which measures atmospheric phase fluctuations, were operated at the VLBA site (3720 m altitude) on Mauna Kea, Hawaii.

1995 March to 1996 June

	Quartiles			Summary		Variations
	25%	Median	75%	c. dist.	time	Seasonal	Diurnal	Combined
225 GHz Transparency [t₂₂₅]	0.074	0.125	0.246	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz
Phase Stability [µm]†				gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz
Temperature [°C]	3.9	6.2	8.5	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz
Dew Point [°C]	-22.6	-15.0	-4.7	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz
Pressure [mbar]	653.0	654.4	655.6	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz
Wind Speed [m s^-1]	2.8	4.7	7.0	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz	gif, ps.gz
Wind Direction				gif, ps.gz

† R. m. s. path length fluctuations in 10 min intervals on 300 m baseline. 1994 December to 1996 July.

Yearly and monthly summaries

1996

Month	225 GHz Transparency	Phase Stability	Temperature	Dew Point	Pressure	Wind Speed	Wind Direction
year	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
July		gif,ps.gz
June	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
May	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
April	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
March	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
February	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
January	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz

1995

Month	225 GHz Opacity	Phase Stability	Temperature	Dew Point	Pressure	Wind Speed	Wind Direction
year	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
December	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
November	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
October	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
September	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
August	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
July	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
June	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
May	gif,ps.gz		gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
April	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
March	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz	gif,ps.gz
February		gif,ps.gz
January		gif,ps.gz

1994

Month	225 GHz Transparency	Phase Stability	Temperature	Dew Point	Pressure	Wind Speed	Wind Direction
December		gif,ps.gz

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Last modified 2000 September 14

Simon Radford