TY - JOUR AU - Ibrahim Reda AU - Jinan Zeng AU - Jonathan Scheuch AU - Leonard Hanssen AU - Daryl Myers AU - Boris Wilthan AU - Tom Stoffel C2 - Journal of Atmospheric and Solar-Terrestrial Physics DA - 2012-03-01 00:03:00 LA - en PB - Journal of Atmospheric and Solar-Terrestrial Physics PY - 2012 TI - An absolute cavity pyrgeometer to measure the absolute outdoor longwave irradiance with traceability to International System of Units, SI ER -