Data collection

data	digit	unit
datetime
wind speed	2	m/s
wind direction	2	°
pressure	2	hPa
temperature	2	°C
humidity	2	%
is raining	2	boolean
day seeing	2	arcsec
day input signal	2	arbitrary
sky temperature	2	°C

data	digit	unit
datetime
wind speed	2	m/s
wind direction	2	°
pressure	2	hPa
temperature	2	°C
humidity	2	%
is raining	2	boolean
day seeing	2	arcsec
day input signal	2	arbitrary
sky temperature	2	°C
elevation	2	m
corrected day seeing	2	arcsec

#	Name	Description	Variable	Type	Unit
1	datetime	timestamp in UTC	datetime	string
2	status	DIMM status	status	String
3	night seeing	seeing given by the C-DIMM	night_see	float	arcsec
4	night $r_{0}$	Fried parameter $r_{0}$ given by the C-DIMM	night_r0	float	cm
5	night scintillation	standard deviation of maximum value measured by the C-DIMM on a star	scint	float	ADU (0-255)
6	night flux	average flux measured by the C-DIMM on a star (no turbulence parameters if night flux < 40)	transp	float	ADU (0-255)
7	day seeing	seeing value given by the SSM	day_see	float	arcsec
8	day $r_{0}$	Fried parameter $r_{0}$ given by the SSM	day_r0	float	cm
9	day input signal	SSM input level after amplification, measures below .5 at full gain are discarded	tbd_1	float	[0,1]
10	internal temp	internal temperature of the Sky Monitor	temp	float	°C
11	pressure	pressure given by the weather station	press	float	hPa
12	altitude	altitude estimated from pressure	tbd_2	float	m
13	internal humidity	relative humidity in the Sky Monitor	humid	float	%
14	sky temperature	temperature of the sky at zenith given by a LWIR sensor	sky_temp	float	°C
15	sky temp sensor ambient temp	internal temperature given by the LWIR sensor	int_temp	float	°C
16	irradiance	irradiance of the sky at zenith	irrad	float	mag/arcsec²
17	Lux	irradiance of the sky in lux from LDR (not as precise as the Irradiance measurement)	lux	integer	Lux
18	day gain	internal gain of the SSM, from 6 (low amplification) to 14 (high amplification)	ssm_int	integer
19	wind direction	0-360° (North: 0° or 360°, South : 180°)	d_wind_dir	integer	degrees
20	wind speed	instant wind speed	d_wind	float	km/h
21	wind gust	DEPRECATED	d_wind_gust	float
22	temperature	external temperature from the weather station	d_ext_temp	float	°C
23	humidity	external humidity from the weather station	d_humid	float	%
24	rain	cumulated rain, increments over time and drops to 0 when it reaches 500 mm	d_rain	float	mm
25	rain rate	rain rate given by the weather station, response time about 1 minute	d_rain_rate	float	mm/h
26	pyrgeometer temp	temperature of the sky given by the pyrgeometer	pyr_temp	float	°C
27	pyrgeometer ambiant temp	internal temperature given by the pyrgeometer	pyr_amb_temp	float	°C
28	PWC	precipitable water column given by LWIR sensor	wat_col_hei	float	cm
29	downwelling IR	downwelling infrared	down_ir	float	W/m²
30	day seeing stddev	standard deviation of daytime seeing measured on 120 samples per second	day_see_stddev	float	arcsec
31	night isoplanatic angle	nighttime turbulence spatial coherency	isoplan_angle	float	arcsec

¶ Data Generated by the Sky Monitor

¶ Standard acquisition

¶ High speed acquisitions

¶ Data columns definition table