Grossmugl Lightmeter

From hms.sternhell.at
Revision as of 12:17, 13 April 2016 by GuentherWuchterl (Talk | contribs)

Jump to: navigation, search
The Großmugl Lightmeter - View towards NW. Orion is visible near the horizon and trees and clouds show the residual uplight of Großmugl that contributes less then 10% to the light at night under clear moond less condition as measured by the station in 2015. Image: G. Wuchter, kuffner-Sternwarte.at 2016-04-10 app 22h MESZ. Exposure Value -7. All rights reserved by the author.

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)

Maintainance 2015-07-10

Diagnostics: The Lightmeter sent empty data files since mid May.

  • Visit showed that the local backup storage was full preventing further loggin;
  • data moved to netbook and station-function checked;
  • lightrouter restartet after network check;
  • sensor position OK;
  • sensor shows some dirt; cleaning before winter intended;
  • on/off timer reset to MEZ; on/of set to 14:30 to 15:00
  • Panorama taken from sensor position;
  • back Lightmeter up and running at 21 MESZ

Data preview (by nero)

--GW (talk) 21:01, 10 July 2015 (CEST)

Maintainance 2016-04-10

FL + GW; nach Astr. Dämmerung; Untergehender junger Mond; teilweise Cirrus

Sensor checked; Sensor cleaned; Foto before/after; Panorama; Lightrouter reboot; Dark-current (sensor covered):

                             mean   sig   median
    Best covered (darkest): 1111 +/- 26;  1100   2016-04-10 18:28:20 bis 2016-04-10 18:30:30
    Long stretch            1160 +/- 50;  1150   2016-04-10 18:18:20 bis 2016-04-10 18:36
    Second Method (+hand)   1556     32;  1543   2016-04-10 18:45:00 bis 2016-04-10 18:49

--GW (talk) 11:58, 12 April 2016 (CEST)

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

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()
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.

Grossmug Lightmeter and SQM-measurements form http://nightsky.at

Notes

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