Aug 27 – 29, 2018
Paris, France
Europe/Paris timezone

Metrology of the Solar Spectral Irradiance at the Top of Atmosphere in the Near Infrared using Ground Based Instruments: The PYR-ILIOS campaign

Aug 28, 2018, 12:00 PM
Charpak room (Paris, France)

Charpak room

Paris, France

Pierre and Marie Curie campus Sorbonne University
talk Session 2: Results from recent space missions Session 2: Results from recent space missions


Mr Nuno José Pereira (BIRA-IASB)


The near infrared (NIR) part of the solar spectrum is of prime importance for the solar physics and climatology, directly intervening in the Earth's radiation budget. Despite its major role, available solar spectral irradiance (SSI) NIR datasets, space-borne or ground based, present discrepancies caused by instrumental or methodological reasons. We present new results obtained from the PYR-ILIOS campaign, which is a replication of the previous IRSPERAD campaign which took place in 2011 at the Iza\~{n}a Observatory (IZO). We used the same instrument and primary calibration source of spectral irradiance. A new site was chosen for PYR-ILIOS: the Mauna-Loa observatory in Hawaii (3397 m asl), approximately 1000 m higher than IZO. Relatively to IRSPERAD, the methodology of monitoring the traceability to the primary calibration source was improved. The results as well as a detailed error budget are presented. We demonstrate that the most recent results, from PYR-ILIOS and other space-borne and ground-based experiments show an NIR SSI lower than ATLAS3 for wavelengths above $1.6 \mu m$.

Primary author

Mr Nuno José Pereira (BIRA-IASB)


Mr David Bolsée (BIRA-IASB) Dr Dominique Sluse (IASB) Dr Gaël Cessateur (BIRA-IASB) Dr Peter Sperfeld (PTB) Mr Sven Pape (PTB)

Presentation materials