Grossmugl Lightmeter

General Metadata

 Location: Grossmugl (Lower Austria)
 Sensor-position: 1) Downtown Grossmugl, roof of http://www.charlys.at, 
                  2) northern chimney top (decommissioned), moved
                  3) S-end of the main-building roof.
  x.Observer.long="16:13:50"; x.Observer.lat="48:29:57";x.Observer.elev=217 # Grossmugl
   

AT_Groszmugl_2

Information

  First light 26th November 2013
  Lightmeter Mark2.3L,

Calibration

 a,b,c,x0,d=1.163e+05,1.218e-07,3.638e-06,-4.142e-03,3.774e-03 #at_groszmugl_2, c fuer [lx]

so für den dritten wiener lichtbereicht (zweiter jahresbericht) verwendet.

--Nero2401 12:46, 23. Jan. 2014 (UTC)

AT_Groszmugl_1

Information

  First light 20th October 2009
  Lightmeter Mark2.3, "IYA", # L002

  Note: Non-horizontal (slipped from nominal position): March/April to June 26th 2010

  2011-08-18: Sensor posistion checked (binocular + telefoto-images); --GuentherWuchterl 20:54, 30. Aug. 2011 (UTC)

Ursprünglich mit "Charly's Laptop" betrieben. Dieser verstarb im März (?) 2013 an einem Hardwaredefekt (Festplatte + weitere Komponenten). Wurde ab 11. August '13 mit einem Lightrouter betrieben. Sensor wurde am 26.11.'13 getauscht, da durch Wackelkontakte viele Daten verloren gegangen waren. Gehäuse von L002 dürfte leck geworden sein.

Calibration

Kalibration - Morgenstunden des 3. August

thumb|Kalibration erstellt am 31.8.2011

 In [37]: x=lies_Verzeichnis('/home/lightmeter1/Desktop/LIGHT/atmugl2011-08-30/kali1/', Datenschritt=10, timezone=1);
 In [38]: x.Observer.elev=217; x.Observer.lat="48:29:17.5"; x.Observer.long="16:13:22.8"; # grossmugl Leeberg
 In [39]: x.plot_NatLight(); x.plot_Mond_GR_Lux_h_extinction()
 In [40]: x.plot(5e-6)
 In [42]: ssh1=(x.Sunheight_deg_from_JD(x.JD)>30)|((x.Sunheight_deg_from_JD(x.JD)<0)&(x.Sunheight_deg_from_JD(x.JD)>-18))
 In [48]: snd1=(x.JD>mx.DateTime.DateTime(2011,8,3,1,12,0).jdn) & (x.JD<mx.DateTime.DateTime(2011,8,3,1,15,0).jdn)
 In [51]: sjd1=(x.JD>mx.DateTime.DateTime(2011,8,3,0,0,0).jdn) & (x.JD<mx.DateTime.DateTime(2011,8,3,8,48,0).jdn)
 In [52]: sjd2=(x.JD>mx.DateTime.DateTime(2011,8,3,10,4,0).jdn) & (x.JD<mx.DateTime.DateTime(2011,8,3,10,30,0).jdn)
 In [53]: SELECT=(sjd1|sjd2)&ssh1&(~(snd1))
 In [59]: x.fit_em1_to_natLight(JD_select=SELECT, Lux_range=[0.00001,300000]);
 Fit: a,b,c,x0,d,: 1.303e+05,1.696e-02,1.713e-07,-1.232e-03,5.046e-03, (res2/(N-n-1))^1/2 = 0.0289 ,N=1769,n= 5
 In [60]: a,b,c,x0,d= 1.303e+05,1.696e-02,1.713e-07,-1.232e-03,5.046e-03
 In [68]: x.plot_Sunlight_Watt_per_square_meter_from_JD_DM(surface_pressure=1010.0, T_dew_C=15.0, factor=110, c='c', marker=',' , linestyle=':')
 In [69]: legend(prop=matplotlib.font_manager.FontProperties(size='small'),loc='center left')
 In [70]: x.set_simple_time_axis_format()

thumb|Die August-Kalibration auf März-Daten angewandt.

a , b , c , x0 , d = 1.303e+05 , 1.696e-02 , 1.713e-07 , -1.232e-03 , 5.046e-03

--Nero2401 21:45, 31. Aug. 2011 (UTC)

Kalibration 27/28Juni mit Mond (outdated)

In [58]: SJD1=(X.JD > mx.DateTime.DateTime(2010,6,27,15,30).jdn) & (X.JD < mx.DateTime.DateTime(2010,6,27,20,45).jdn) In [59]: SJD2=(X.JD > mx.DateTime.DateTime(2010,6,28,5,00).jdn) & (X.JD < mx.DateTime.DateTime(2010,6,28,12,00).jdn) In [60]: SSH=(X.Sunheight_deg_from_JD(X.JD)>25)|((X.Sunheight_deg_from_JD(X.JD)<0)&(X.Sunheight_deg_from_JD(X.JD)>-16)) In [61]: SJD=(SJD1|SJD2)&SSH

In [62]: X.fit_em1_to_natLight(Lux_range=[0.001, 200000], JD_select=SJD, type='em1c0T') Fit: a,b,c,x0,d,: 1.34853e+05,4.28114e-02,1.23346e-07,-1.44545e-03,6.44011e-03,res2/(N-n-1) = 0.121 ,N = 523, n= 5

Grossmugl - Lightmeter compared to nearby SQM-measurements

These measurements show a typical time-dependence of night sky brightness in a relatively good summer night. Note the time-variations as compared to measurements on various observing sites about 30km to the North of Vienna on, August 9th 2010. This example is to meant illustrate the importance of continuous measurements for site comparison to distinguish between temporal variations (light weahter) and site specific differences.

Notes

Transfered from the old lightmeter wiki: --GW (talk) 14:34, 11 June 2015 (CEST)