Impulses of the geomagnetic secular variation (jerks) at vassouras magnetic observatory detected by wavelet analysis

Pinheiro, Katia; Travassos, Jandyr M.

doi:10.1590/s0102-261x2010000100003

Cited by 5 publications

(3 citation statements)

References 12 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally the proportionality of the geomagnetic jerks energy to the phase of 6-yr Alfvén wave is experienced in the Fig. 3 (Nevanlinna, 2004;Balasis et al, 2016;Qamili et al, 2013;Duka et al, 2012;Pinheiro and Travassos, 2010;Alexandrescu et al, 1996;De Michelis et al, 2005;Ducruix et al, 1983;Chambodut and Mandea, 2005;Cafarella and Meloni, 1995;Macmillan, 1996;Brown et al, 2013;Chulliat and Maus, 2014).…”

Section: Modulational and Decay Instabilities Of The Slow MC (And Ros...mentioning

confidence: 99%

Clockwise and counter clockwise 6 & 9 year geostrophic MC (& Rossby) waves in centre of the mechanism of geomagnetic jerks and relevant LODs

Lutephy

ISMAILOV

Abdulkadhim³

2022

Contrib. Geophys. Geod.

View full text Add to dashboard Cite

Versus the theory of fully stochastically mechanism of geomagnetic jerks based on the buoyant force driven Quasi-Geostrophic (QG) dynamo, the torsional waves in realistic condition of the Earth's core evolve in the intradecadal time scales. Geostrophic slow MC (& Rossby) waves as entanglement of inertial and Alfvén waves are the source of 6 & 9 year geomagnetic secular variations inferred with intradecadal variations in the Earth's rotation rate defined by length of day. From MHD equations in the Earth's liquid metal core, we find a suit of equations equivalent with Hall-MHD in plasma physics with variables and coefficients defined merely in the system of Earth's core dynamo. On reductive perturbation theory, it is deduced derivative nonlinear Schrödinger (DNLS) equation which describes torsional Alfvén waves. In nonlinearity, Modulational and decay instabilities of torsional Alfvén waves in the Earth's core maintain and control occurrences of the geomagnetic jerks and relevant LODs via perturbation theory. Instability induced from a small amplitude perturbation of the plane Alfvén wave can lead to an exponential growth or decay of nonlinear structures to maintain large amplitude turbulences, reasonable to produce the geomagnetic jerks and relevant LODs. Then interplanetary tiny electromagnetic inductions on the Earth's core dynamo via perturbation theory in nonlinearity can produce the jerks and relevant LODs. Also the first-order perturbation of 6-yr Alfvén wave for modulational instability yields to the localized wave-packets called Kuznetsov-Ma breather coincided to 14-yr periodicity for jerk's reports in the years 1902, 1916, 1930, 1944, 1958, 1972, 1986, 2000, 2014. We don't deny the random turbulences but we find that the random driven jerks have lower energies.

show abstract

Section: Modulational and Decay Instabilities Of The Slow MC (And Ros...mentioning

confidence: 99%

Clockwise and counter clockwise 6 & 9 year geostrophic MC (& Rossby) waves in centre of the mechanism of geomagnetic jerks and relevant LODs

Lutephy

ISMAILOV

Abdulkadhim³

2022

Contrib. Geophys. Geod.

View full text Add to dashboard Cite

show abstract

“…Geomagnetic jerks of a global nature have been investigated using both frequency analysis [28] and wavelet analysis [29]. For the individual observatories the initial research was conducted on the bases of annual mean values of measurements, from which the temperature drift of electronic measuring instruments is eliminated.…”

Section: Geomagnetic Jerksmentioning

confidence: 99%

Accelerations in the Local Magnetic Field on the Adriatic Tectonic Microplate

Čop¹,

Rasson²,

Bilc³

2021

OJER

View full text Add to dashboard Cite

The high level of noise is a special feature of the geomagnetic field on the territory of Slovenia. The tension of the Adriatic tectonic microplate, on which Slovenia entirely lies, was recognized as one of its sources. The interior of the Earth is also the source of geomagnetic jerks. They are impulses in the secular variation calculated on the basis of monthly or annual mean values of variation of the geomagnetic field. The paper presents an analysis of accelerations in a local magnetic field calculated on the bases of daily mean values of the magnetic field measured at PIA geomagnetic Observatory (Piran, Slovenia) in 2020. These accelerations indicate geomagnetic impulses at the regional level over days or weeks. Then these results are compared with the registered seismic activity in the West Balkans.

show abstract

“…Algunos de los autores mencionados han analizado los impulsos seculares estudiando los promedios mensuales en lugar de los promedios anuales de los registros de las estaciones. Esta elección depende de lo que se intente estudiar, de acuerdo con Pinheiro y Travassos [15]: si se desea atenuar las contribuciones externas se toman los promedios anuales mientras que si se desea precisar el momento del impulso secular se toman los promedios mensuales [15]. Más aún, distintos impulsos observados en una misma región pueden comportarse en forma diferente (ver Kotzé [11] y referencias en ese trabajo).…”

Section: Introductionunclassified

Secular Behavior in the Geomagnetic Data at Permanentobservatories in Argentina

Sallago

2024

AnAFA

View full text Add to dashboard Cite

The secular variation of the geomagnetic field is the temporal variation that takes place in the field on time scales between few years to hundreds or thousands of years. On the other hand, impulses or ”geomagnetic jerks” indicate a rapid change in the slope of the secular variation. The origin of these phenomena is linked to the behavior of the geodynamo and the contribution of the outer mantle-core interaction.ROMP (acronym from spanish “ Red de Observatorios Magnéticos Permanentes”) is composed by the following observatories: ”Las Acacias ”(LAS) at Buenos Aires,” Trelew ”(TRW) at Chubut,” Pilar ”(PIL) at Córdoba and ”Orcadas”(ORC) at the Argentine sector in Antartic; the first two depend on the National University of La Plata and the latter on the National Meteorological Service. In the present work one analyzes the secular variation and the determination of jerks in the geomagnetic elements recorded at the ROMP stations, in historical times up to the present.

show abstract

Impulses of the geomagnetic secular variation (jerks) at vassouras magnetic observatory detected by wavelet analysis

Cited by 5 publications

References 12 publications

Clockwise and counter clockwise 6 & 9 year geostrophic MC (& Rossby) waves in centre of the mechanism of geomagnetic jerks and relevant LODs

Clockwise and counter clockwise 6 & 9 year geostrophic MC (& Rossby) waves in centre of the mechanism of geomagnetic jerks and relevant LODs

Accelerations in the Local Magnetic Field on the Adriatic Tectonic Microplate

Secular Behavior in the Geomagnetic Data at Permanentobservatories in Argentina

Contact Info

Product

Resources

About