On Sea-Level Change in Coastal Areas

Courtillot, Vincent; Mouël, Jean‐Louis Le; Lopes, Fabrício Martins; Gibert, Dominique

doi:10.3390/jmse10121871

Cited by 3 publications

(2 citation statements)

References 70 publications

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“…There are no other possibilities of natural motion at first order. Inside as well as at its surface the pattern of fluid motion must be the same (cf [33,56]; see [57,58], for some illustrations). We have applied Singular Spectrum Analysis (SSA, eg [61]) in order to extract the trend (this sub-section) and the annual and semi-annual components (next subsection) from the three time series of sea-level at Brest, magnetic field at CLF and length of day.…”

Section: The Magnetostatic Fieldmentioning

confidence: 99%

Is the Earth's magnetic field a constant ? a legacy of Poisson

Mouël¹,

Lopes²,

Courtillot³

et al. 2023

Preprint

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In the report he submitted to the Académie des Sciences, Poisson imagined a set of concentric spheres at the origin of the Earth's magnetic field. It may come as a surprise to many that Poisson as well as Gauss both considered the magnetic field to be constant. We propose in this study to test this surprising assertion for the first time evoked by Poisson (1826). First, we will present a development of Maxwell's equations in the framework of a static electric field and a static magnetic field in order to draw the necessary consequences for the Poisson hypothesis. In a second step, we will see if the observations can be in agreement with Poisson (1826). To do so, we have chosen to compare 1) the polar motion drift and the secular variation of the Earth's magnetic field, 2) the seasonal pseudo-cycles of day length together with those of the sea level recorded by different tide gauges around the globe and those of the Earth's magnetic field recorded in different magnetic observatories. We then propose a mechanism, in the spirit of Poisson, to explain the presence of the 11-year in the magnetic field. We test this mechanism with observations and finally we study closely the evolution of the g10 coefficient *

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Section: The Magnetostatic Fieldmentioning

confidence: 99%

Is the Earth's magnetic field a constant ? a legacy of Poisson

Mouël¹,

Lopes²,

Courtillot³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Inside as well as at its surface, the pattern of fluid motion must be the same (cf. [33,57]; see [58,59] for some illustrations). Possibly the longest series of magnetic measurements is that of declination D compiled for Paris (France) by Alexandrescu et al ([60,61]).…”

Section: On the Drift Of The Magnetic Dipolementioning

confidence: 99%

Is the Earth’s Magnetic Field a Constant? A Legacy of Poisson

et al. 2023

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In the report he submitted to the Académie des Sciences, Poisson imagined a set of concentric spheres at the origin of Earth’s magnetic field. It may come as a surprise to many that Poisson as well as Gauss both considered the magnetic field to be constant. We propose in this study to test this surprising assertion for the first time, evoked by Poisson in 1826. First, we present a development of Maxwell’s equations in the framework of a static electric field and a static magnetic field in order to draw the necessary consequences for the Poisson hypothesis. In a second step, we see if the observations can be in agreement with Poisson. To do so, we choose to compare (1) the polar motion drift and the secular variation of Earth’s magnetic field, (2) the seasonal pseudo-cycles of day length together with those of the sea level recorded by different tide gauges around the globe and those of Earth’s magnetic field recorded in different magnetic observatories. We then propose a mechanism, in the spirit of Poisson, to explain the presence of the 11-year cycle in the magnetic field. We test this mechanism with observations, and finally, we study closely the evolution of the g1,0 coefficient of the International Geomagnetic Reference Field (IGRF) over time.

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On the external forcing of global eruptive activity in the past 300 years

Le Mouël,

Gibert,

Courtillot

et al. 2023

Front. Earth Sci.

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The decryption of the temporal sequence of volcanic eruptions is a key step in better anticipating future events. Volcanic activity results from a complex interaction between internal and external processes, with time scales spanning multiple orders of magnitude. We review periodicities that have been detected or correlated with volcanic eruptions/phenomena and interpreted as resulting from external forces. Taking a global perspective and longer time scales than a few years, we approach this interaction by analyzing three time-series using singular spectral analysis: the global number of volcanic eruptions (NVE) between 1700 and 2022, the number of sunspots (ISSN), a proxy for solar activity, and polar motion (PM) and length of day (lod), two proxies for gravitational force. Several pseudo-periodicities are common to NVE and ISSN, in addition to the 11-year Schwabe cycle that has been reported in previous work, but NVE shares even more periodicities with PM. These quasi-periodic components range from −5 to −130 years. We interpret our analytical results in light of the Laplace’s paradigm and propose that, similarly to the movement of Earth’s rotation axis, global eruptive activity is modulated by commensurable orbital moments of the Jovian planets together with Pluto, whose influence is also detected in solar activity.

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On Sea-Level Change in Coastal Areas

Cited by 3 publications

References 70 publications

Is the Earth's magnetic field a constant ? a legacy of Poisson

Is the Earth's magnetic field a constant ? a legacy of Poisson

Is the Earth’s Magnetic Field a Constant? A Legacy of Poisson

On the external forcing of global eruptive activity in the past 300 years

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