Analytical Estimation of the Scale of Earth-Like Planetary Magnetic Fields

Bologna, Mauro; Tellini, Bernardo

doi:10.1007/s11038-014-9447-5

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…The thermal evolution model supports the possibility of partially differentiated planetesimals that can sustain long‐lived dynamos lasting tens of millions of years (Elkins‐Tanton et al., 2011; Weiss & Elkins‐Tanton, 2013). Moreover, Bologna and Tellini (2014) provided an alternative mechanism driven by the Seebeck effect in the core that could generate an Earth‐like field. While spacecraft missions have not confirmed the existence of partially differentiated asteroids with dynamo activity (or other possible field originating from the Seebeck effect), the high density and chondritic surface composition of asteroid 21 Lutetia make it a notable candidate for a partially differentiated asteroid (Weiss et al., 2012).…”

Section: Introductionmentioning

confidence: 99%

A Non‐Magnetized Chondrite Parent Body Revealed by Paleomagnetic Investigation of LL6 Chondrite NWA 14180

Li,

Wang,

Wen

et al. 2024

JGR Planets

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Magnetic records from meteorites provide valuable information about the formation and evolution of the solar system and planets. The parent planetesimals of chondrites are typically considered to be undifferentiated based on their primary chemical composition and texture. However, recent paleomagnetic investigations of various chondrites indicate that they carry a primary remanence generated by a dynamo, suggesting partial differentiation of their parent planetesimals. The presence of a dynamo within the parent planetesimal of LL chondrites remains uncertain due to the ambiguous origin of the remanent magnetism. Here, we report petrographic, paleomagnetic, and rock magnetic properties for the novel LL6 chondrite NWA 14180. The high metamorphic temperature experienced by NWA 14180 could have removed the pre‐accretionary remanence. The fusion crust baked‐contact test suggests that NWA 14180 preserves primary magnetic information about its parent body. Alternating field demagnetization results from interior subsamples reveal distinct low‐ and medium‐coercivity components that may represent a viscous remanent magnetization acquired in the geomagnetic field. No natural remanent magnetization was unblocked in the high coercivity range, implying that NWA 14180 cooled in zero‐field conditions. Therefore, we suggest that the parent body of NWA 14180 did not have a dynamo. Furthermore, this result suggests that the LL chondrite parent planetesimal accreted later and was smaller in size than other chondrite classes.

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Section: Introductionmentioning

confidence: 99%

A Non‐Magnetized Chondrite Parent Body Revealed by Paleomagnetic Investigation of LL6 Chondrite NWA 14180

Li,

Wang,

Wen

et al. 2024

JGR Planets

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Spontaneous magnetic field in the interactions of transverse plasmons with electron-positron-ion plasma

2019

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The magnetic field generated by transverse plasmons in three-component electron-positron-ion plasma is investigated based on a kinetic model. Nonlinear coupling equations, self-consistently describing the nonlinear behavior of high-frequency transverse plasmons, low-frequency density perturbation, and quasistatic self-generated magnetic fields, are derived considering the nonlinear wave-wave and wave-particle interactions. The governing equations can be easily reduced to the ones obtained in conventional electron-ion and electron-positron plasmas. There will be no spontaneous magnetic field in the pure electron-positron plasma due to the same mass of the electron and the positron. It is shown that the self-generated magnetic field is relevant to the mass difference of plasma particles, which is modulationally unstable. The increase in the amplitude of the pump wave field or the decrease in the ion concentration will lead to a faster growth of the self-generated magnetic field and higher intermittent magnetic flux.

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Analytical Estimation of the Scale of Earth-Like Planetary Magnetic Fields

Cited by 2 publications

References 31 publications

A Non‐Magnetized Chondrite Parent Body Revealed by Paleomagnetic Investigation of LL6 Chondrite NWA 14180

A Non‐Magnetized Chondrite Parent Body Revealed by Paleomagnetic Investigation of LL6 Chondrite NWA 14180

Spontaneous magnetic field in the interactions of transverse plasmons with electron-positron-ion plasma

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