Izvorni znanstveni članak
https://doi.org/10.17794/rgn.2026.5.10
TOWARD A GIC HAZARD MODEL FOR INDONESIA: ANALYSING LATITUDINAL EFFECTS OF GEOMAGNETIC STORMS ON THE 210° MAGNETIC MERIDIAN
Setyanto Cahyo Pranoto
; Research Center for Space, National Research and Innovation Agency, Bandung 40173, Indonesia.
Anwar Santoso
; Research Center for Space, National Research and Innovation Agency, Bandung 40173, Indonesia.; Physics Department, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, Indonesia.
*
Sismanto Sismanto
; Physics Department, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, Indonesia.
Eddy Hartantyo
; Physics Department, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, Indonesia.
Rhorom Priyatikanto
; Research Center for Space, National Research and Innovation Agency, Bandung 40173, Indonesia.
Nizam Ahmad
; Research Center for Smart Mechatronics. National Research and Innovation Agency, Bandung, Indonesia.
Silmie Vidiya Fani
; Research Center for Space, National Research and Innovation Agency, Bandung 40173, Indonesia.
Djohar Syamsi
; Research Center for Smart Mechatronics. National Research and Innovation Agency, Bandung, Indonesia.
Kuncoro Wisnu
; Research Center for Space, National Research and Innovation Agency, Bandung 40173, Indonesia.
Mario Batubara
; Research Center for Space, National Research and Innovation Agency, Bandung 40173, Indonesia.
Fitri Nuraeni
; Research Center for Space, National Research and Innovation Agency, Bandung 40173, Indonesia.
Siska Filawati
; Research Center for Space, National Research and Innovation Agency, Bandung 40173, Indonesia.
Muzirwan Muzirwan
; Research Center for Climate and Atmospheric, National Research and Innovation Agency, Jakarta, Indonesia.
* Dopisni autor.
Sažetak
Geomagnetically induced currents (GICs) arise during geomagnetic storms, which alters ionospheric and magnetospheric current systems from auroral to equatorial latitudes. This study examines the latitudinal response of the H component (ΔH) during 91 storm events (56 coronal mass ejection (CME)-driven and 35 corotating interaction regions (CIR)-driven) from 1992 to 1999. This study uses data from 29 observatories along the 210° magnetic meridian (MM), both storm types exhibit a distinct inverted-omega (ω) latitudinal structure, the biggest around the aurora, characterized by a strong auroral electrojet (AE), minima near ~±50° magnetic latitude, and enhanced low-latitude disturbances linked to equatorial electrojet (EEJ) currents. CME-driven storms produce larger ΔH amplitudes and steeper gradients due to impulsive forcing and prompt penetration electric fields (PPEFs), whereas CIR-driven storms show weaker but more persistent responses influenced by disturbance dynamo electric fields (DDEFs) processes. In the Indonesian sector, at Biak and Pontianak (~9°–17° S magnetic latitude), low-latitude responses are comparable to near-equatorial observations, indicating efficient penetration of equatorial electrodynamics. Despite smaller absolute ΔH amplitudes than at auroral latitudes, these responses remain spatially coherent and significant. The transition region near ~±50° magnetic latitude and the distinct day-night asymmetry between storm types provide important constraints for GIC hazard assessment in equatorial power systems. Usually, the large ΔH in CME-driven storms is often accompanied by an enhanced dB/ dt. The geomagnetic storms by CME-driven can generate significant geoelectric fields even at low latitudes. The results show that Indonesia is not immune to the hazards associated with GIC. The observed systematic structure (ω) and associated geoelectric fields provide new evidence that Indonesia’s regions are potentially subject to substantial GIC impacts, particularly with CME-driven storms.
Ključne riječi
geomagnetic storm; equatorial electrojet (EEJ); coronal mass ejection (CME); corotating interaction region (CIR); 210° magnetic meridian
Hrčak ID:
352859
URI
Datum izdavanja:
27.10.2026.
Posjeta: 0 *