ANALYSIS OF CLOUD-TO-GROUND (CG) LIGHTNING DENSITY MAP IN MANADO CITY USING THE INVERSE DISTANCE WEIGHTING (IDW) METHOD IN 2023: ANALISIS PETA KERAPATAN PETIR TIPE CLOUD TO GROUND (CG) DI WILAYAH KOTA MANADO MENGGUNAKAN METODE INVERSE DISTANCE WEIGHTING (IDW) TAHUN 2023

Haifany; Agus Setyo Budi; Wahyudi Nasrul Pratama

doi:10.21009/03.1301.FA02

Authors

Haifany Program Studi Fisika, FMIPA, Universitas Negeri Jakarta
Agus Setyo Budi Program Studi Fisika, FMIPA, Universitas Negeri Jakarta
Wahyudi Nasrul Pratama Pusat Seismologi Teknik, Geopotensial, dan Tanda Waktu (PSGT), BMKG

DOI:

https://doi.org/10.21009/03.1301.FA02

Abstract

Indonesia, located along the equator, experiences a high frequency of lightning strikes. Its geographical position makes the archipelago vulnerable to atmospheric conditions that favor the formation of lightning. The phenomenon of lightning can cause damage to buildings, forest fires, even injury or death if not properly alerted. This research aims to create a map of the density of Cloud to Ground (CG) lightning strikes in the Manado region in 2023. In addition, this research also aims to determine the sub-districts that have the highest lightning density in the Manado City area. The data used is the Manado City boundary obtained from the Badan Pusat Statistik (BPS) and Manado City lightning strike record data during 2023 obtained from the Badan Meteorologi Klimatologi dan Geofisika (BMKG). The method used is Inverse Distance Weighting (IDW) interpolation using QGIS application and Nexstorm Analysis. From the results of the density map made with a 1 km x 1 km grid, Manado City has a very low lightning density level because it is dominated by the color Light Green (1-2). Sub-districts that have the highest lightning density are Wanea and Malalayang which are dominated by Orange (4-5) and Red (>5-9) colors with lightning density levels of 67.133758 (many lightning/km2) and 51.1682243 (many lightning/km2) respectively, while the sub-district with the lowest lightning density is Mapanget with a lightning density level of 6.33165829 (many lightning/km2). The highest number of lightning strikes occurred in May with 869 strikes and the least occurred in February with 15 strikes.

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