Validating the LDi and LCi Indices in the Southern Hemisphere
Authors
Nahayo, Enmanuel; Guerrero Ortega, Antonio; Lotz, Stefan; Cid Tortuero, Consuelo; Tshisaphungo, Mpho; [et al.]Identifiers
Permanent link (URI): http://hdl.handle.net/10017/57171DOI: 10.1029/2022SW003092
ISSN: 1542-7390
Publisher
AGU
Date
2022-09-18Funders
Agencia Estatal de Investigación
Bibliographic citation
Nahayo, E. [et al.] 2022, "Validating the LDi and LCi Indices in the Southern Hemisphere", Space Weather, vol. 20, no. 10, pp. 1-16.
Project
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-119407GB-I00/ES/AVANZANDO EN LA ALERTA DE FENOMENOS PROVOCADOS POR LA INTERACCION CON EL SOL ACTIVO/
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
https://doi.org/10.1029/2022SW003092Rights
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Access rights
info:eu-repo/semantics/openAccess
Abstract
The validation of the Local Disturbance index (LDi) and its first time derivative Local Current index (LCi) is performed in the Southern Hemisphere. Two South African magnetic observatories, Hermanus and Hartebeesthoek contributed data for this study, and two South African power stations, Grassridge and Matimba, provided geomagnetically induced current (GIC) data. This validation focused on two major geomagnetic storms, Halloween and Saint Patrick's Day events that occurred in October 2003 and March 2015, respectively. The comparative evaluation of the LDi and LCi indices was executed with the help of the local horizontal component (H) and also comparing them to the global index SYM-H. A direct comparison to measured GIC shows that LCi performs slightly better than dH/dt as a proxy for GIC. The comparison of the LDi 1-hr magnetic disturbances values to ones calculated applying a Linear phase Robust Non-Smoothing method to the H component yields a Pearson correlation coefficient R greater than 0.960 for different groups of magnetic storms based on intensity. The estimated SYM-H index from LDi data showed a possible difference of about 300 nT from the published SYM-H index values around 20:00 UT on 29 October 2003, during the Halloween storm. This study has shown that the LDi and LCi indices, developed in the Northern Hemisphere, can be calculated at similar latitudes in the Southern Hemisphere for studying local space weather conditions and now-casting successfully local geomagnetic events.
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