Analisis Tomografi Tiga Dimensi Gangguan Ionosfer selama Siklon Tropis Senyar 2025 di Sumatra

Cahyaningrum, Vivi (2026) Analisis Tomografi Tiga Dimensi Gangguan Ionosfer selama Siklon Tropis Senyar 2025 di Sumatra. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ionosfer dapat mengalami gangguan akibat gelombang atmosfer yang dibangkitkan oleh cuaca ekstrem di atmosfer bawah. Penelitian ini menganalisis karakteristik dan distribusi tiga dimensi gangguan ionosfer selama Siklon Tropis Senyar 2025 di Sumatra menggunakan data GNSS dari 64 stasiun Ina-CORS pada 26 November 2025 pukul 00:00 dan 06:00 UTC. Anomali TEC (dTEC) diperoleh melalui detrending polinomial orde 8, kemudian dianalisis melalui lintasan Sub-Ionospheric Point, spektrum frekuensi, travel-time diagram, Checkerboard Resolution Test (CRT), dan tomografi tiga dimensi pada ketinggian 100–600 km. Hasil menunjukkan variasi dTEC hingga −1,136 s.d. +0,794 TECU dengan frekuensi dominan 1,111 mHz (±15 menit) dan kecepatan propagasi 0,259 km/s (00:00 UTC) serta 0,100 km/s (06:00 UTC), konsisten dengan Traveling/Concentric Traveling Ionospheric Disturbances akibat Atmospheric Gravity Waves. Indeks Dst, Kp, dan F10.7 tidak menunjukkan badai geomagnetik kuat atau aktivitas Matahari ekstrem. Uji CRT menghasilkan persentase inversi 29,75–61,16% (00:00 UTC) dan 40,17–56,41% (06:00 UTC). Model tomografi menurunkan RMS dari 0,098 menjadi 0,034 TECU (00:00 UTC) dan dari 0,198 menjadi 0,084 TECU (06:00 UTC), dengan anomali kerapatan elektron yang bergeser ke selatan seiring bertambahnya ketinggian pada kedua epoch.
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The ionosphere can be disturbed by atmospheric waves generated by extreme weather in the lower atmosphere. This study analyzes the characteristics and three-dimensional distribution of ionospheric disturbances during Tropical Cyclone Senyar 2025 in Sumatra using GNSS data from 64 Ina-CORS stations on 26 November 2025 at 00:00 and 06:00 UTC. TEC anomalies (dTEC) were obtained through eighth-order polynomial detrending, then analyzed through Sub-Ionospheric Point trajectories, frequency spectrum analysis, travel-time diagrams, Checkerboard Resolution Test (CRT), and three-dimensional tomography at altitudes of 100–600 km. The results showed dTEC variations up to −1.136 to +0.794 TECU, a dominant frequency of 1.111 mHz (±15 minutes), and propagation velocities of 0.259 km/s (00:00 UTC) and 0.100 km/s (06:00 UTC), consistent with Traveling/Concentric Traveling Ionospheric Disturbances generated by Atmospheric Gravity Waves. The Dst, Kp, and F10.7 indices indicated no strong geomagnetic storm or extreme solar activity. The CRT yielded inversion percentages of 29.75–61.16% (00:00 UTC) and 40.17–56.41% (06:00 UTC). The tomographic models reduced RMS values from 0.098 to 0.034 TECU (00:00 UTC) and from 0.198 to 0.084 TECU (06:00 UTC), with electron density anomalies shifting southward with increasing altitude in both epochs.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	GNSS, Ionosfer, Siklon Tropis Senyar, STEC, Tomografi Tiga Dimensi, GNSS, Ionosphere, STEC, Three-Dimensional Tomography, Tropical Cyclone Senyar
Subjects:	Q Science > QC Physics > QC881.2.I6 ionosphere
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Vivi Cahyaningrum
Date Deposited:	02 Sep 2026 04:31
Last Modified:	02 Sep 2026 04:31
URI:	http://repository.its.ac.id/id/eprint/138898

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