Geomagnetic activity at Northern Hemisphere's mid-latitude ground stations: How much can be explained using TS05 model

Castillo, Yvelice Soraya; Pais, Maria Alexandra; Fernandes, J.; Ribeiro, Paulo; Morozova, Anna; Pinheiro, F. J. G.

doi:10.1016/j.jastp.2017.11.002

Cited by 23 publications

(9 citation statements)

References 39 publications

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“…The Y component variability, being strongly dependent on the FAC current system because of its poloidal symmetry, is expected to be significantly affected by the unrealistic closure of FAC through the Earth's center in the TS05 model. Statistical results reported by Castillo et al (2017) confirmed that TS05 model performs better in reproducing the X than the Y variability. For this reason, only TS05 simulations for the X-component were used to compute the T-indices.…”

Section: Simulations Of Magnetospheric Contributionsmentioning

confidence: 64%

“…Since, in the TS05 model, the inner ring current and the more distant tail current sheet form a current system circulating close and parallel to the geomagnetic equator, the variability associated to these currents is more clearly retrieved in the X-component of the geomagnetic field (Castillo et al, 2017). We computed estimates of hourly values for the X component at the four northern hemisphere mid-latitude geomagnetic observatories of Coimbra (Portugal), Panagurishte (Bulgary), Novosibirsk (Russia) and Boulder (USA) (see Castillo et al (2017)), for the period 2009-2016, keeping separate contributions from different sources. Table 1 shows the geographic and geomagnetic coordinates of the four observatories.…”

Section: Simulations Of Magnetospheric Contributionsmentioning

confidence: 99%

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Relating 27-day Averages of Solar, Interplanetary Medium Parameters and Geomagnetic Activity Proxies in Solar Cycle 24

Rosales

Pais

Fernandes

et al. 2021

Preprint

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Correlations between solar, interplanetary medium parameters and geomagnetic activity proxies in 27-day averages (a Bartels’ rotation) were analysed for the 2009-2016 time interval. In this analysis, two new proxies were considered: 1) B ZS GSM, calculated as the daily percentage of the IMF southward component along the GSM Z-axis and then averaged every 27 days; 2) four magnetospheric indices (T-indices), calculated from the local North-South (X) contributions of the magnetosphere's cross-tail (TAIL), the symmetric ring current (SRC), the partial ring current (PRC) and the Birkeland current (FAC), derived from Tsyganenko and Sitnov 2005 (TS05) semi-empirical magnetospheric model. Our results suggest that, among the parameters tested in this study, solar facular areas, interplanetary magnetic field intensity and new proxies derived from TS05 model could be taken into account in an empirical model, with a 27-day resolution, to explain geomagnetic activity felt on the Earth's surface in terms of solar surface features and the IMF condition. We further retrieve a clear annual oscillation in series of 27-day-mean values of toward/away asymmetries of geomagnetic activity indices, which can be interpreted in the light of Russell-McPherron hypothesis for the semiannual variation of geomagnetic activity.

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Section: Simulations Of Magnetospheric Contributionsmentioning

confidence: 64%

Section: Simulations Of Magnetospheric Contributionsmentioning

confidence: 99%

Relating 27-day Averages of Solar, Interplanetary Medium Parameters and Geomagnetic Activity Proxies in Solar Cycle 24

Rosales

Pais

Fernandes

et al. 2021

Preprint

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“…Submitted for publication. Castillo, Y., Pais, M.A., Fernandes, J., Ribeiro, P., Morozova, A.L., Pinheiro, F.J.G. 2017.…”

Section: Discussionmentioning

confidence: 99%

The Magnetic Observatory of Coimbra (COI): Past, Present Operating Status and Future Developments

Ribeiro¹,

Pais²,

Morozova³

2018

Proceedings of the II PAN AMERICAN WORKSHOP ON GEOMAGNETISM – II PANGEO

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“…Amm & Viljanen, 1999), distant magnetospheric sources are the main contributors to geomagnetic activity at mid-latitudes (e.g. Dubyagin et al, 2014;Castillo et al, 2017). The assumption of uniform driving sources is used in this study, since the distance to the auroral and equatorial electrojets is large (Boteler & Pirjola, 2017).…”

Section: Geomagnetic Field Datamentioning

confidence: 99%

“…Contrary to high latitude observatories, where non-uniform ionospheric sources contribute strongly to GICs (e.g., Amm & Viljanen, 1999), distant magnetospheric sources are the main contributors to geomagnetic activity at mid-latitudes (e.g., Castillo et al, 2017;Dubyagin et al, 2014). The assumption of uniform driving sources is used in this study, since the distance to the auroral and equatorial electrojets is large .…”

Section: Geomagnetic Field Datamentioning

confidence: 99%

First Estimations of Geomagnetically Induced Currents in the South of Portugal

2021

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Geomagnetic storms induce electric fields in the conducting Earth, which are the source of geomagnetically induced currents (GICs) in grounded power lines. In this study, we compute time‐varying geoelectric fields induced in the southern region of the Portuguese mainland at the time of the strongest geomagnetic storms during solar cycle 24, using a plane‐wave approximation. The driving geomagnetic storm signals are obtained from series recorded at the Coimbra magnetic observatory. Magnetotelluric impedance tensors used to compute the induced electric field are obtained using a conductivity model that takes into account general features of the local lithology and the proximity to the sea. The first GIC simulations for Portugal are presented, using data from the national high voltage power network. Starting with an a priori standard uniform electric field to compute electromotive forces, we first assess the susceptibility of the power system network given only its topology and resistance parameters. For real storms, we report (i) the clustering of the horizontal geomagnetic time variation around the northwest‐southeast direction, (ii) the simulation of the effect of the western and southern coastlines of the territory over the induced electric field, and (iii) the spotting of the substations most sensitive to storms in the studied region.

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Geomagnetic activity at Northern Hemisphere's mid-latitude ground stations: How much can be explained using TS05 model

Cited by 23 publications

References 39 publications

Relating 27-day Averages of Solar, Interplanetary Medium Parameters and Geomagnetic Activity Proxies in Solar Cycle 24

Relating 27-day Averages of Solar, Interplanetary Medium Parameters and Geomagnetic Activity Proxies in Solar Cycle 24

The Magnetic Observatory of Coimbra (COI): Past, Present Operating Status and Future Developments

First Estimations of Geomagnetically Induced Currents in the South of Portugal

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