Credits

Credits and licences.

Cloud. Data Source: Environment and Climate Change Canada. The HRDPS forecast, under ECCC's Data Services End-use Licence, version 2.1.1.

Current conditions: Environment and Climate Change Canada.

Aurora activity. GFZ German Research Centre for Geosciences, the Hp30 index, under CC BY 4.0. Changed: the outlook's typical activity is the month's median of GFZ's Hp30 over dark intervals, computed by us; the nowcast's reading is GFZ's value as published. Data: Matzka et al. 2024, doi:10.5880/Hpo.0003.

Sky brightness, estimated by us from NASA Black Marble. NASA VIIRS Land Science Investigator-led Processing System. (2025). VIIRS/NPP Lunar BRDF-Adjusted Nighttime Lights Yearly L3 Global 15 arc second Linear Lat Lon Grid [Dataset]. NASA Level 1 and Atmosphere Archive and Distribution System Distributed Active Archive Center. https://doi.org/10.5067/VIIRS/VNP46A4.002

Horizons. Terrain from the Terrarium tiles. ArcticDEM: DEM(s) were created from DigitalGlobe, Inc., imagery and funded under National Science Foundation awards 1043681, 1559691, and 1542736. Canada: Contains information licensed under the Open Government Licence – Canada.

The oval on the home page. NOAA Space Weather Prediction Center, the OVATION aurora forecast, public domain. It is smoothed and brightened for the globe, so it is not NOAA's own image, and no call uses it.

The globe's map. Made with Natural Earth, public domain.

Icons from Tabler Icons (MIT licence), and the night switch adapted from Heroicons (MIT licence). The globe and the towns' scenes drawn with three.js (MIT licence) and meshoptimizer (MIT licence). Type in BDO Grotesk (licence) and JetBrains Mono (licence), under the SIL Open Font License 1.1.

The model's methods, as published. Twilight: Patat, Ugolnikov and Postylyakov 2006 (A&A 455, 385). Moonlight: Krisciunas and Schaefer 1991 (PASP 103, 1033). Airmass: Kasten and Young 1989 (Appl. Opt. 28, 4735). Sky brightness: Garstang 1986 and Cinzano et al. 2000 (PASP 98, 364, MNRAS 318, 641). Geomagnetic latitude: Shepherd 2014 (JGR Space Physics 119, 7501), computed with aacgmv2 2.7.1 (doi:10.5281/zenodo.19462137). Solar wind: Newell et al. 2007 and 2008 (JGR 112, A01206, JGR 113, A04218), for an estimate kept beside each call and used in none.

Reusing the forecasts: credits.json names each source's terms, GFZ's licence and what we changed.