Coagulation and accretion of magnetized dust: A source of remanent cometary magnetism?

Nübold, Henrik; Glaßmeier, Karl‐Heinz

doi:10.1016/s0273-1177(99)80210-5

Cited by 8 publications

(2 citation statements)

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“…If magnetic interaction is to change the dust aggregation scenario, we have to assume the existence of a nebular dust component carrying remanent magnetization (Nuth et al 1994, Nübold and Glassmeier 1999. The following paragraphs present evidence as to the extent this assumption seems to be justified.…”

Section: Magnetic Dust In the Solar Nebulamentioning

confidence: 96%

Magnetic Aggregation: Dynamics and Numerical Modeling

Dominik¹,

Nübold

2002

Icarus

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Section: Magnetic Dust In the Solar Nebulamentioning

confidence: 96%

Magnetic Aggregation: Dynamics and Numerical Modeling

Dominik¹,

Nübold

2002

Icarus

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“…Magnetic field measurements performed during the descent and the four surface contacts of Rosetta's Philae lander on November 12, 2014 (Glassmeier et al 2007a;Biele et al 2015;Ulamec & Taylor 2016), made it possible to derive an upper bound for the magnetization of the target comet 67P/Churyumov-Gerasimenko (67P). The magnetization of comets is not only important because magnetic fields may have played a role in the formation of such objects (Nübold & Glassmeier 1999;Fu & Weiss 2012), but also allows us to constrain the strength of the background magnetic field in the early solar system (Wang et al 2017). Using concurrent observations from the magnetometer of the Rosetta Plasma Consortium (RPC-MAG, Glassmeier et al 2007b) and the Rosetta Lander Magnetometer and Plasma Monitor (ROMAP, Auster et al 2007), Auster et al (2015) derived an upper limit for the specific magnetic moment of <3.1 × 10 −5 Am 2 kg −1 for meter-sized homogeneous boulders.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the magnetization of comet 67P/Churyumov-Gerasimenko

Heinisch

Auster

Richter

et al. 2019

A&A

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Context. The landing of the Philae probe as part of the ESA Rosetta mission made it possible to study the magnetization of comet 67P/Churyumov-Gerasimenko (67P) by combining observations from the lander and orbiter. In this work, we revisit the magnetic properties with information gained during the progression of the mission for a comprehensive understanding of the circumstances of Philae's descent and landing. Aims. The aim is to derive a limit for any possible magnetization of the cometary material on the surface of 67P. To achieve this, the surface contacts of Philae were analyzed. Combined with a more detailed understanding of the background magnetic field, this allows us to interpret the underlying magnetic measurements in detail. Methods. We combined magnetic field observations from the ROMAP magnetometer on board Philae with observations from the RPC-MAG instrument on board the Rosetta orbiter. To facilitate this, a correlation analysis was used to correct phase shifts between the observed signals. Additionally, in-flight calibration of the ROMAP offsets was performed using information about the dynamics of Philae during flight. These corrections made it possible to use the orbiter measurements as reference for the comet-based Philae observations. We assumed a simple dipole model and used the magnetic field observations to derive an upper limit for the magnetization of the cometary material.Results. An upper limit of 0.9 nT for the observed magnetic field on the surface of 67P was derived for any contribution from surface magnetization. For homogeneously magnetized pebbles with a size of typical aggregates in the range of ∼5 cm, this translates into an upper limit of ∼5 × 10 −5 Am 2 kg −1 for the specific magnetic moment. Depending on the exact history of formation, this results in an upper limit of 4 µT for the magnitude of the magnetic field in the solar nebula during the formation of comet 67P.

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