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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20100408T000000
DTEND;TZID=Atlantic/Canary:20100408T010000
UID:iactalks-12
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/12
CREATED:2010-04-08T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Using artificial sky glow to retrieve night time aerosol optical de
 pth
DESCRIPTION:Using artificial sky glow to retrieve night time aerosol optica
 l depth\nDr. Martin Aubé\n\nMeasuring the Aerosol Optical Depth (AOD) is 
 of particular importance in monitoring aerosol contributions to global rad
 iative forcing and air quality. Most measuring methods are based on direct
  or indirect observation of sunlight and thus are only available for use d
 uring daylight hours. Attempts have been made to measure AOD behavior at n
 ight from star photometry, and more recently moon photometry. Star photome
 try method uses spectrally calibrated stars as reference targets this prov
 ides somewhat more flexibility than a sun photometer but there are low-sig
 nal and calibration issues which can make these measurements problematic. 
 Moon photometry is only possible when the moon is present in the sky. We s
 uggest a complementary method, based on the observation of artificial sky 
 glow generated by light pollution. The methodology requires (1) the implem
 entation of an heterogeneous 3D light pollution model and (2) the design o
 f an automated light pollution spectrometer which will be presented here. 
 The instrument designated as the Spectrometer for Aerosol Night Detection 
 (SAND) is now in its third version. Basically, SAND-3 is an automated CCD 
 based, long-slit spectrometer protected from inclement weather by an acryl
 ic dome. SAND have been used successfully in many astronomical sites along
  with some urban sites. Our first day/night (continuity) AOD measurements 
 comparisons with AERONET/AEROCAN sunphotometer data will be shown for Sher
 brooke university (Quebec, Canada) atmospheric optical observatory.
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