Implantation in Interplanetary Dust of Rare-Gas Ions from Solar Flares
Measurements of excess Ar 36 + Ar 38 (released mainly at 1200°C) in magnetic concentrates of Pacific sediments and in a dense concentrate of Greenland dust agree within an order of magnitude with expected concentrations implanted by solar-flare ion streams of energy less than 10 Mev per atomic-mass...
| Published in: | Science |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
American Association for the Advancement of Science (AAAS)
1966
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1126/science.153.3739.981 https://www.science.org/doi/pdf/10.1126/science.153.3739.981 |
| Summary: | Measurements of excess Ar 36 + Ar 38 (released mainly at 1200°C) in magnetic concentrates of Pacific sediments and in a dense concentrate of Greenland dust agree within an order of magnitude with expected concentrations implanted by solar-flare ion streams of energy less than 10 Mev per atomic-mass unit. The agreement implies that more than 10 percent of each concentrate may be extraterrestrial, depending on size distribution and flare spectra. Rare-gas measurements on fine-grained dust can provide data on: solar-flare "paleo-ion" fluxes, energy spectra, and isotopic abundances; identification, mineralogy, and chemistry of interplanetary dust; influx rates to Earth and sedimentation rates of oceanic cores; and lunar-surface residence and mixing times. |
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