Detrital remanent magnetization in the solar nebula
We introduce the theoretical basis of a new form of remanent magnetization that likely formed on primitive bodies in the solar system. Accretional detrital remanent magnetization (ADRM) operates via “compass needle”-type alignment of ferromagnetic solids with locally uniform background fields in the...
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Geophysical Union (AGU)
2012
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| Online Access: | http://hdl.handle.net/1721.1/74216 https://orcid.org/0000-0003-3113-3415 https://orcid.org/0000-0003-3635-2676 |
| _version_ | 1811086437067522048 |
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| author | Fu, Roger Rennan Weiss, Benjamin P. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Fu, Roger Rennan Weiss, Benjamin P. |
| author_sort | Fu, Roger Rennan |
| collection | MIT |
| description | We introduce the theoretical basis of a new form of remanent magnetization that likely formed on primitive bodies in the solar system. Accretional detrital remanent magnetization (ADRM) operates via “compass needle”-type alignment of ferromagnetic solids with locally uniform background fields in the solar nebula. Accretion of coherently aligned magnetic particles should have formed aggregates up to centimeters in size with significant net magnetic moment. We quantify several processes that constrain the likelihood of ADRM formation, finding that rotational gas damping and background field intensities expected for the solar nebula are sufficient to mutually align magnetic particles with diameters between ∼30 μm and several cm. The lower bound is dictated by Brownian motion or radiative torque while the upper bound is set by aerodynamic torque on non-spherical particles. Processes important for interstellar dust dynamics such as Larmor-type precession and Purcell torque are less significant in the solar nebula. ADRM can be potentially observed as zones of coherent magnetization in primitive chondrites and may be detected by spacecraft magnetic field observations on the surfaces of small bodies. Observational identification and characterization of ADRM would constrain the strength and geometry of magnetic fields in the early solar system, the accretion process of sub-meter sized objects, the formation regions of chondrite parent bodies, and the alteration history of chondritic components. |
| first_indexed | 2024-09-23T13:25:54Z |
| format | Article |
| id | mit-1721.1/74216 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:25:54Z |
| publishDate | 2012 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/742162022-10-01T15:14:32Z Detrital remanent magnetization in the solar nebula Fu, Roger Rennan Weiss, Benjamin P. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Fu, Roger Rennan Weiss, Benjamin P. We introduce the theoretical basis of a new form of remanent magnetization that likely formed on primitive bodies in the solar system. Accretional detrital remanent magnetization (ADRM) operates via “compass needle”-type alignment of ferromagnetic solids with locally uniform background fields in the solar nebula. Accretion of coherently aligned magnetic particles should have formed aggregates up to centimeters in size with significant net magnetic moment. We quantify several processes that constrain the likelihood of ADRM formation, finding that rotational gas damping and background field intensities expected for the solar nebula are sufficient to mutually align magnetic particles with diameters between ∼30 μm and several cm. The lower bound is dictated by Brownian motion or radiative torque while the upper bound is set by aerodynamic torque on non-spherical particles. Processes important for interstellar dust dynamics such as Larmor-type precession and Purcell torque are less significant in the solar nebula. ADRM can be potentially observed as zones of coherent magnetization in primitive chondrites and may be detected by spacecraft magnetic field observations on the surfaces of small bodies. Observational identification and characterization of ADRM would constrain the strength and geometry of magnetic fields in the early solar system, the accretion process of sub-meter sized objects, the formation regions of chondrite parent bodies, and the alteration history of chondritic components. United States. National Aeronautics and Space Administration. Origins Program 2012-10-23T17:31:45Z 2012-10-23T17:31:45Z 2012-02 2011-08 Article http://purl.org/eprint/type/JournalArticle 0148-0227 http://hdl.handle.net/1721.1/74216 Fu, Roger R., and Benjamin P. Weiss. “Detrital Remanent Magnetization in the Solar Nebula.” Journal of Geophysical Research 117.E2 (2012). ©2012 American Geophysical Union https://orcid.org/0000-0003-3113-3415 https://orcid.org/0000-0003-3635-2676 en_US http://dx.doi.org/ 10.1029/2011je003925 Journal of Geophysical Research Planets Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Geophysical Union (AGU) MIT web domain |
| spellingShingle | Fu, Roger Rennan Weiss, Benjamin P. Detrital remanent magnetization in the solar nebula |
| title | Detrital remanent magnetization in the solar nebula |
| title_full | Detrital remanent magnetization in the solar nebula |
| title_fullStr | Detrital remanent magnetization in the solar nebula |
| title_full_unstemmed | Detrital remanent magnetization in the solar nebula |
| title_short | Detrital remanent magnetization in the solar nebula |
| title_sort | detrital remanent magnetization in the solar nebula |
| url | http://hdl.handle.net/1721.1/74216 https://orcid.org/0000-0003-3113-3415 https://orcid.org/0000-0003-3635-2676 |
| work_keys_str_mv | AT furogerrennan detritalremanentmagnetizationinthesolarnebula AT weissbenjaminp detritalremanentmagnetizationinthesolarnebula |