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E. CARSTEA1,* , K. FRAGKOS2, M. ADAM1
Longwave downward radiation (LWDR) from the ERA5 reanalysis was validated against pyrgeometer measurements at the Baseline Surface Radiation Network (BSRN) INO station in Magurele, Romania, for 2021–2022. Hourly comparisons show excellent agreement, with R = 0.94, a slope of 0.98 ± 0.003, and a small intercept (1.6 ± 0.9 W m⁻²). The mean bias (+4.8 W m⁻²), MAE (13 W m⁻²), and RMSE (18.5 W m⁻²) confirm ERA5 accuracy. Seasonal differences reveal underestimation during winter, while summer values agree within ±5 W m⁻². ERA5 provides reliable LWDR estimates for South-Eastern Europe, with strong potential for climatological, energy-balance, and optoelectronic applications.
Solar radiation, Longwave irradiance, BSRN station, ERA5 reanalysis.
E. CARSTEA, K. FRAGKOS, M. ADAM, Validation of longwave downward radiation estimated by ERA5 reanalysis using measured BSRN INO station data, Optoelectronics and Advanced Materials - Rapid Communications, 19, 11-12, November-December 2025, pp.549-554 (2025).
Submitted at: Oct. 1, 2025
Accepted at: Dec. 2, 2025
Optoelectronics and Advanced Materials - Rapid Communications
(2024): Impact Factor = 0.4 - Journal Citation Reports (Clarivate Analytics, 2025)
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