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It is required to properly simulate the production and performance of PV plants based on technologies with different spectral characteristics. Spectroradiometers can only sense the solar spectrum within a wavelength range that is usually too short compared to the actual spectral response of some PV technologies. In this work, a new methodology based on the Simple Model of the Atmospheric Radiative Transfer of Sunshine (SMARTS) spectral code is proposed to extend the spectral range of measured direct irradiance spectra and to increase the spectral resolution of such experimental measurements. Satisfactory results were obtained for both clear and hazy sky conditions at a radiometric station in southern Spain. This approach constitutes the starting point of a general methodology to obtain the instantaneous spectral irradiance incident on the plane of array of PV modules and its temporal variations, while evaluating the magnitude and variability of the abundance of atmospheric constituents with the most impact on surface irradiance, most particularly aerosols and water vapor.<\/jats:p>","DOI":"10.3390\/rs15061675","type":"journal-article","created":{"date-parts":[[2023,3,20]],"date-time":"2023-03-20T07:56:37Z","timestamp":1679298997000},"page":"1675","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Increasing the Resolution and Spectral Range of Measured Direct Irradiance Spectra for PV Applications"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0117-6713","authenticated-orcid":false,"given":"Gabriel","family":"L\u00f3pez","sequence":"first","affiliation":[{"name":"Departamento Ingenier\u00eda El\u00e9ctrica y T\u00e9rmica, de Dise\u00f1o y Proyectos, Escuela T\u00e9cnica Superior de Ingenier\u00eda, Universidad de Huelva, 21007 Huelva, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0362-4655","authenticated-orcid":false,"given":"Christian A.","family":"Gueymard","sequence":"additional","affiliation":[{"name":"Solar Consulting Services, Colebrook, NH 03576, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2431-2773","authenticated-orcid":false,"given":"Jes\u00fas","family":"Polo","sequence":"additional","affiliation":[{"name":"Photovoltaic Solar Energy Unit (CIEMAT), 28040 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0902-5680","authenticated-orcid":false,"given":"Joaqu\u00edn","family":"Alonso-Montesinos","sequence":"additional","affiliation":[{"name":"Departamento Qu\u00edmica y F\u00edsica, Universidad de Almer\u00eda, 04120 Almer\u00eda, Spain"},{"name":"CIESOL, Joint Centre of the University of Almer\u00eda-CIEMAT, 04120 Almer\u00eda, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7795-5241","authenticated-orcid":false,"given":"Aitor","family":"Marzo","sequence":"additional","affiliation":[{"name":"Departamento \u00d3ptica, Universidad de Granada, 18071 Granada, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4224-6618","authenticated-orcid":false,"given":"Nuria","family":"Mart\u00edn-Chivelet","sequence":"additional","affiliation":[{"name":"Photovoltaic Solar Energy Unit (CIEMAT), 28040 Madrid, Spain"}]},{"given":"Pablo","family":"Ferrada","sequence":"additional","affiliation":[{"name":"Centro de Desarrollo Energ\u00e9tico Antofagasta (CDEA), Universidad de Antofagasta, Antofagasta 1240000, Chile"}]},{"given":"Martha Isabel","family":"Escalona-Llaguno","sequence":"additional","affiliation":[{"name":"Universidad Aut\u00f3noma de Zacatecas, Zacatecas 98000, Mexico"}]},{"given":"Francisco Javier","family":"Batlles","sequence":"additional","affiliation":[{"name":"Departamento Qu\u00edmica y F\u00edsica, Universidad de Almer\u00eda, 04120 Almer\u00eda, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1002\/pip.995","article-title":"Effects of solar spectrum and module temperature on outdoor performance of photovoltaic modules in round-robin measurements in Japan","volume":"19","author":"Ishiil","year":"2010","journal-title":"Prog. 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