Other
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...51..155f&link_type=abstract
Icarus, vol. 51, July 1982, p. 155-163.
Other
29
Early Stars, Solar System, Stellar Evolution, Stellar Radiation, X Ray Sources, Aluminum Isotopes, Lunar Composition, Main Sequence Stars, Meteoritic Composition, Regolith, Solar Activity Effects, Solar Flares, Solar Wind, T Tauri Stars
Scientific paper
Recent observations of soft X-ray emission from solar-type stars obtained with the Einstein X-Ray Observatory indicate that X-ray luminosity is inversely correlated with stellar age. If this result is applied to the sun and if X-ray emission is a valid indicator of other manifestations of solar activity, then past solar wind and flare levels can be inferred. It can qualitatively explain the excess xenon and nitrogen found in the lunar regolith compared to the level expected from the contemporary solar wind. X-ray emission from T Tauri and other low-mass pre-main-sequence stars is both highly luminous and variable, indicating the presence of flares approximately 4000 times stronger than the largest flares seen in the contemporary sun. The proton flux from such solar flares during the one to ten million-year pre-main-sequence phase would be sufficient to account for the Al-26 anomaly in meteorites.
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