Regional geomagnetic core field and secular variation model over the Iberian Peninsula from 2014 to 2020 based on the R-SCHA technique

Puente-Borque, Marina; Pavón-Carrasco, F. Javier; Núñez, Alberto; Tordesillas, José Manuel; Campuzano, Saioa A.

doi:10.1186/s40623-023-01873-w

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…At the end of 2021, the agonic line crossed the Royal Observatory of Madrid (ROM) changing the declination on this place from west values to east values. According to the Geomagnetic Reference Model for the Iberian Peninsula and Balearic Islands (also named as Geomagnetic Iberian Model, Puente-Borque et al, 2023;more information in Supplementary Material) this event occurred on 12 September 2021 (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…To get the real time declination at ROM, we translated the declination data observed at San Pablo de los Montes Observatory (SPT), the closest Spanish observatory (110 km far away from ROM). The spatial translation of the declination data from SPT site to ROM coordinates was carried out using the current spatial gradient provided by the Geomagnetic Iberian model (Puente-Borque et al, 2023). Original daily mean declination data from SPT and the translation data to ROM are plotted in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Historical evolution of the geomagnetic declination at the Royal Observatory of Madrid

Tordesillas,

Pavón-Carrasco,

Nuñez

et al. 2024

Preprint

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Abstract. The agonic line, representing geomagnetic declinations of 0°, recently crossed the Royal Observatory of Madrid (ROM) in December 2021, causing a shift in declination values from west to east. This event constitutes a notable milestone for this significant place, where the first geomagnetic observation series in Spain commenced around 1855. Consequently, a thorough investigation into the historical evolution of the declination has been undertaken to decipher prior occurrences of the agonic line crossing at the ROM. Despite the ROM hosted the first series of geomagnetic measurements in Spain, the present lack of geomagnetic measurements in this observatory makes necessary to extend the declination measurements to other observatories distributed throughout the Iberian Peninsula to better define the passage of the agonic line since 1855 up to the present. For periods prior to 1855, a bibliographic search for declination measurements conducted in the Iberian Peninsula has been carried out, complemented by historical data from the HISTMAG database. As a result, a time-continuous curve of geomagnetic declination is generated from 1590 to 2021 at the ROM coordinates. The declination curve reveals that the agonic line also crossed the ROM 400 years ago (around 1600) passing from west to east declination values.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Historical evolution of the geomagnetic declination at the Royal Observatory of Madrid

Tordesillas,

Pavón-Carrasco,

Nuñez

et al. 2024

Preprint

View full text Add to dashboard Cite

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Improved high-precision regional marine geomagnetic anomaly field model using Legendre polynomial expansion

Zhu,

Li,

Zhu

et al. 2024

AIP Advances

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Regional geomagnetic field models can provide detailed insights into the geomagnetic field and are of substantial value for precise maritime navigation and the detection of marine targets. In light of the polynomial model’s numerous advantages, including straightforward computation, rapid computation speed, and high model resolution, this study delves into the polynomial modeling method. To address the challenges of enhancing solution precision, selecting the optimal polynomial function, and determining the optimal truncation degree, it introduces an improved method based on singular value decomposition to enhance the model’s accuracy at higher degrees. A comparison of the Taylor polynomial model, the Laguerre polynomial model, and the Chebyshev polynomial model revealed the superiority of the Legendre polynomial model in terms of truncation degree, modeling accuracy, and boundary effect. In addition, by employing K-fold cross-validation, the complete dataset is effectively leveraged for both fitting and validation, thereby facilitating the identification of the optimal truncation degree for each polynomial model. The superior accuracy of the regional geomagnetic field models is validated through a comparative analysis of the calculation results derived from the EMM2017 model.

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Historical evolution of the geomagnetic declination at the Royal Observatory of Madrid

Tordesillas,

Pavón-Carrasco,

Nuñez

et al. 2024

Hist. Geo Space. Sci.

View full text Add to dashboard Cite

Abstract. The agonic line, which represents geomagnetic declinations of 0°, recently crossed the Royal Observatory of Madrid (ROM) in December 2021, causing a shift in declination values from west to east. This event constitutes a notable milestone for this significant observatory, where the first geomagnetic observation series commenced around 1855 in Spain. In this work, taking advantage of the occurrence of this event, a detailed study has been conducted to investigate the historical evolution of the magnetic declination at the ROM to decipher prior occurrences of the agonic line crossing this place. Despite the ROM having hosted the first series of geomagnetic measurements in Spain, the present lack of geomagnetic measurements in this observatory makes it necessary to extend the declination measurements to other observatories distributed throughout the Iberian Peninsula to better define the passage of the agonic line since 1855 up to the present. For epochs prior to 1855, a bibliographic search for declination measurements conducted in the Iberian Peninsula has been carried out, complemented by historical data from the HISTMAG database. As a result, a time-continuous curve of geomagnetic declination is generated from 1590 to 2022 at the ROM coordinates. The declination curve reveals that the agonic line also crossed the ROM 400 years ago (around 1600), passing from western to eastern declination values.

show abstract

Regional geomagnetic core field and secular variation model over the Iberian Peninsula from 2014 to 2020 based on the R-SCHA technique

Cited by 3 publications

References 21 publications

Historical evolution of the geomagnetic declination at the Royal Observatory of Madrid

Historical evolution of the geomagnetic declination at the Royal Observatory of Madrid

Improved high-precision regional marine geomagnetic anomaly field model using Legendre polynomial expansion

Historical evolution of the geomagnetic declination at the Royal Observatory of Madrid

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