TY - JOUR T1 - Measurement and Determination of Light Pollution: Case Study of Malatya City AU - Yılmaz, Abdulvahap AU - Özdemir, Tuncay PY - 2021 DA - June Y2 - 2021 JF - Turkish Journal of Astronomy and Astrophysics JO - TJAA PB - Türk Astronomi Derneği WT - DergiPark SN - 2757-7295 SP - 38 EP - 43 VL - 2 IS - 1 LA - en AB - In this study, measurements of light pollution in and around Malatya city center were carried out by means of parcelization and mapping method with SQM (Sky quality meter) device. Measurements were carried out in the east, west, north and south directions at 5$^\circ$ intervals between the zenith and horizon in 7 regions in order to determine the effect of angle dependence in 84 points at the zenith references. Measurements which are taken in the lowest (bright) and highest (dark) regions measured are 16.53 mag arcsec$^{-2}$ and 20.68 mag arcsec$^{-2}$, respectively (Puschnig et~al.). Accepting the atmosphere permeability as 73%, the total amount of light lost (escaping into space and scattered back from the atmosphere) was calculated as $\sim3.44\times 10^7$ lm. The angle dependence effect participated in the calculations and the luminous flux emitted towards the upper half space originating from the unnecessary use of artificial light was calculated as $4~540~973$ lm. This value was calculated as 0.56 Mlm h (megalumen-hour) per year. In the city, street lighting, billboards, lighting on the exteriors of the buildings are considered to be active for approximately 12 hours a day and the amount spent was calculated as 441.720 kWh per month. This calculated value corresponds to 26.99% of the approximate monthly electricity amount (1 636 064.2 kWh per month) causing light pollution. KW - light pollution KW - SQM (Sky quality meter ) KW - Calculation of wasted energy amount CR - Chepesiuk, R. (2009). Karanlığın özlenmesi: ışık kirliliğinin sağlık üzerindeki etkileri.: A20-A27. CR - Çetegen, D., & Batman, A. (2005). Light pollution. Journal of İstanbul Kültür University, 2, 29-34. CR - Aslan, B. (2018). Işığın Kirli Yüzü: Işık Kirliliği. Ankara: S.S Ada Eğitim Kooparetifi. CR - Aksoy, M. (2016). Doğu Akdeniz Enerji Rekabeti. İnsani ve Sosyal Araştırmalar Merkezi, İnsamer, 23. CR - Aslan, B. (2017). Nilüfer İlçesi Işık Kirliliği Araştırma Projesi Sonuç Raporu. Nilüfer Belediyesi. Bursa: Nilüfer Belediyesi. CR - Çetin F. D., Gümüş B., Özbudak Y. B., 2004, Elektrik Mühendisliği, 420, 25 CR - Aksoy E., Söğüt Z., 2008, Çukurova Üniversitesi Fen Bilimleri Enstitüsü Yayınları, 18 CR - Aslan Z., Onaygil S., 1999, in Enerji Tasarrufu Haftası Ulusal Enerji Verimliliği Kongresi. No. 18 in Ulusal Enerji Verimliliği Kongresi. Ankara, pp 54–60 CR - Hänel A., et al., 2018, Journal of Quantitative Spectroscopy and Radiative Transfer, 205, 278 CR - Karımı Ansarı B., 2013, Çukurova Üniversitesi Ziraat Fakültesi Dergisi, 28, 11 CR - Pravettoni M., Strepparava D., Cereghetti N., Klett S., Andretta M., Steiger M., 2016, Journal of Quantitative Spectroscopy and Radiative Transfer, 181, 74 CR - Pun C. S. J., So C. W., Leung W. Y., Wong C. F., 2014, Journal of Quantitative Spectroscopy and Radiative Transfer, 139, 90 CR - Puschnig J., Schwope A., Posch T., Schwarz R., 2014, Journal of Quantitative Spectroscopy and Radiative Transfer, 139, 76 CR - Sánchez de Miguel A., Aubé M., Zamorano J., Kocifaj M., Roby J., Tapia C., 2017, Monthly Notices of the Royal Astronomical Society, 467, 2966 UR - https://dergipark.org.tr/tr/pub/tjaa/issue//888847 L1 - https://dergipark.org.tr/tr/download/article-file/1609655 ER -