Difference between revisions of "Grossmugl Lightmeter"
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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. | 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. | ||
| − | [[ | + | [[File:Nachthimmel Grossmugl und Umgebung 9Aug2010 mit Howdii-Messungen.png|thumb|Grossmug Lightmeter and SQM-measurements form http://nightsky.at]] |
= Notes = | = Notes = | ||
Transfered from the old lightmeter wiki: --[[User:GuentherWuchterl|GW]] ([[User talk:GuentherWuchterl|talk]]) 14:34, 11 June 2015 (CEST) | Transfered from the old lightmeter wiki: --[[User:GuentherWuchterl|GW]] ([[User talk:GuentherWuchterl|talk]]) 14:34, 11 June 2015 (CEST) | ||
Revision as of 14:48, 11 June 2015
Contents
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
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()
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)
