I usually work with daytime satellite images to do some image classification (mostly Landsat data from the USGS EarthExplorer). Right now I'd like to check at some night time images to work on city lights but I don't know which data sets or web services I should take a look at. Ideally, I'd like it to be a data set with long historical data 1970s-now but everything is welcome. Any ideas please?
You can use data from the Suomi National Polar-orbiting Partnership, but it is quite recent (since 2012). e.g ftp://ftp-npp.class.ngdc.noaa.gov/20150611/VIIRS-SDR/VIIRS-Day-Night-Band-SDR/
For longer time series, you can use NOAA DMSP datasets (1992-2013)