Supplementary material from "Transport of dust across the Solar System: Constraints on the spatial origin of individual micrometeorites from cosmic-ray exposure" ...
The origin of micrometeorites (MMs) from asteroids and comets is well-established, but the relative contribution from these two classes remains poorly resolved. Likewise, determining the precise origin of individual micrometeorites is an open challenge. Here, cosmic-ray exposure ages are used to res...
Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
The Royal Society
2024
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Subjects: | |
Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.7218770 https://rs.figshare.com/collections/Supplementary_material_from_Transport_of_dust_across_the_Solar_System_Constraints_on_the_spatial_origin_of_individual_micrometeorites_from_cosmic-ray_exposure_/7218770 |
Summary: | The origin of micrometeorites (MMs) from asteroids and comets is well-established, but the relative contribution from these two classes remains poorly resolved. Likewise, determining the precise origin of individual micrometeorites is an open challenge. Here, cosmic-ray exposure ages are used to resolve the spatial origins of twelve MMs collected from urban areas and Antarctica. Their 26Al and 10Be concentration, produced during cosmic-ray irradiation in space, were measured by accelerator mass spectrometry. These data are compared to results from a model simulating the transport and irradiation of the MM precursors in space. This model, for the first time, considers a variety of orbits, precursor particle sizes, compositions, and densities and incorporates non-isotropic solar and galactic cosmic-ray flux profiles, depth-dependent production rates, as well as spherical evaporation during atmospheric entry. While the origin for six MMs remains ambiguous, two MMs show a preferential tendency towards an origin ... |
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