English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the zaia usage as premium feature

ZAIA

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the access of premium content as premium feature

Premium Content

Zendy Tools

Zendy Open

Anthropogenic skyglow dominates views of the natural night sky in most urbansettings, and the associated emission of artificial light at night (ALAN) intothe environment of cities involves a number of known and suspected negativeexternalities. One approach to lowering consumption of ALAN in cities isdimming or extinguishing publicly owned outdoor lighting during overnighthours; however, there are few reports in the literature about the efficacy ofthese programs. Here we report the results of one of the largest municipallighting dimming experiments to date, involving $\sim$20,000 roadway luminairesowned and operated by the City of Tucson, Arizona, U.S. We analyzed bothsingle-channel and spatially resolved ground-based measurements of broadbandnight sky radiance obtained during the tests, determining that the zenith skybrightness during the tests decreased by ($-5.4\pm0.9$)% near the city centerand ($-3.6\pm0.9$)% at an adjacent suburban location on nights when the outputof the street lighting system was dimmed from 90% of its full power draw to 30%after local midnight. Modeling these changes with a radiative transfer codeyields results suggesting that street lights account for about ($14\pm1$)% oflight emissions resulting in skyglow seen over the city. A separate derivationfrom first principles implies that street lighting contributes only 2-3% oflight seen at the zenith over Tucson. We discuss this inconsistency and suggestroutes for future work.

Recovering the city street lighting fraction from skyglow measurements in a large-scale municipal dimming experiment