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The Sun reflecting in the es_Montsec Lightmeter on the roof of the COU during the May 2016 COST-LoNNe campaign. G. Wuchterl

Montsec Lightmeters

Lightmeters controlled by a lightrouter run at the Parc Astronòmic Montsec (PAM) at the serra del Montsec.

Stations details coming soon.

es_montsec at the Centre d'Observació de l'Univers (COU)

The es_montsec Lightmeter on the roof of the COU during the intercomparison campaign. Guest lightmeters in the background. G. Wuchterl
 Coordinates:  0:44:12.6 E, 42:01:28.8.0 N , 450 m
 Running since 2014-07-16 11:48:04
 Sensor ID: 918076

The lightmeter is installed on an approximately 50 cm high stone wall running around the roof of the COU and thus about 4m above the ground on the northern end of the COU main building.

The (dark) planetarium dome is about 20m to the S in its "closed" position and about 5m to the S in the opened position.

Some reflected light may be present due to the nearby white housings SQMs, at least during the COST campaign in May 2016.

The cielometer, a 1.5m high blue box is about 6m to the W. It should cast shadows on the lightmeter in the late afternoons a few days before the vernal equinox and after the autumn equinox.

  Centre d'Observació de l'Univers (COU)

es_montsecb at the Observatori Astronòmic del Montsec (OAdM)

The Lightmeter (on the outrigger at the lower centre) at the Montsec Observatoriy near Àger

The lightmeter is installed on an approximately 2m arm to avoid shadows and reflections from the rich instrumnentation on roof of the "environmental" container.

Maintenance visit during the COST-LoNNe inter-comparison campaign. Shielded USB-Ethernet extension cable installed after unstable USB-connection was diagnosed. The lightmeter is back up an running since 11:52 UTC on May 5th 2016.

0° 43' 47,3"E,  42° 03' 06,8"N  Elevation 1560 m (from OSM Hike and Bike)
Observatori Astronòmic del Montsec (OAdM)


TBD: weather data for campaign needed.

Preliminary Calibration


  In [301]: SJD1=(X.JD > mx.DateTime.DateTime(2016,5,5,11,52,0).jdn ) & (X.JD < mx.DateTime.DateTime(2016,5,6,0,0,0).jdn )
  In [302]: SSH=(X.Sunheight_deg_from_JD(X.JD)>30.0)|((X.Sunheight_deg_from_JD(X.JD)<-4)&(X.Sunheight_deg_from_JD(X.JD)>-18))
  In [303]: SJD= SJD1 & SSH
 kali_2_r=X.fit_em1_to_natLight(Lux_range=[0.0001, 2.E5], type='em1c0T',JD_select=SJD, time_correction_seconds=0)

Fit: a,b,c,x0,d,: 1.680e+05,1.374e-03,1.825e-06,-3.236e-03,4.518e-03, (res2/(N-n-1))^1/2 = 0.0575 ,N=34077,n= 5

   a 1.6804e+05 +/- 7.8113e+01
   b 1.3738e-03 +/- 7.6956e-06
   c 1.8248e-06 +/- 1.8765e-09
  x0 -3.2358e-03 +/- 4.9124e-05
   d 4.5179e-03 +/- 9.4022e-06

60s running mean to remove the short-frequency signal

kali_2_60=X.fit_em1_to_natLight(Lux_range=[0.0001, 2.E5], type='em1c0T',JD_select=SJD, time_correction_seconds=0) Fit: a,b,c,x0,d,: 1.681e+05,1.376e-03,1.825e-06,-3.245e-03,4.518e-03, (res2/(N-n-1))^1/2 = 0.0567 ,N=34077,n= 5

  a 1.6806e+05 +/- 7.7115e+01
  b 1.3760e-03 +/- 7.6083e-06
  c 1.8246e-06 +/- 1.8525e-09
 x0 -3.2453e-03 +/- 4.8507e-05
  d 4.5176e-03 +/- 9.2813e-06
 (X.JD > mx.DateTime.DateTime(2016,5,20,10,0,0).jdn ) & (X.JD < mx.DateTime.DateTime(2016,5,21,8,30,0).jdn )
 a,b,c,x0,d= 1.740e+05,2.104e-03,1.718e-06,-1.218e-03,5.121e-03
 f = 110 (+/- 5)
 (res2/(N-n-1))^1/2 = 0.0782 ,N=2581,n= 5 es_montsecb 20/21.Mai 2016 mit Mond
 Final calibration needs clear daytime and a stretch of moonless sky.--GW (talk) 14:39, 24 May 2016 (CEST)

Quicklook at the data

  Approximately daily update

--GW (talk) 12:21, 24 May 2016 (CEST)