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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name. |
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STUDIA AMBIENTUM - Issue no. 1-2 / 2009 | |||||||
Article: |
THE RELATIONSHIP BETWEEN SOLAR ACTIVITY AND THE ANNUAL PRECIPITATION IN THE CLUJ-NAPOCA AREA, ROMANIA. Authors: DUMITRU RISTOIU, SANDU-VALER TAHÂȘ. |
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Abstract: Solar radiation is the driving force for the hydrological cycle. However, there are an insufficient number of measurements of solar radiation for many practical problems. In this paper, we examine the relationship between solar activity and the annual precipitation in the Cluj-Napoca area. The results indicate that annual rainfall is closely related to the variation of number of sunspots and less of variation of global solar radiation, and that solar activity probably plays an important role in influencing the precipitation on land. To estimate the global solar radiation from sunshine hours, it is used the Angstrom-Prescott equation. Also, the proposed research here describes the fact that a solar beam can penetrate the atmosphere more easily when there is no rain and it is attenuated when precipitation intensity is higher. Keywords: Sunspot numbers; global solar radiation; precipitation; Angström–Prescott equation; t-test statistics; correlation |
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