Is it possible to get irradiances closer to the current epoch, nowcast, or forecast irradiances in addition to the Research grade version?
Yes, there are system, operational, and professional grade SOLAR2000 versions that produce all these irradiances. For more information, including high time resolution data, please contact SpaceWx or visit the products and services link at http://SpaceWx.com. Additionally, NOAA/SEC hosts the daily nowcast SOLAR2000 irradiances on their server at http://sec.noaa.gov.