摘要: A young magnetically active Sun, with enhanced ionizing radiations and an elevated solar wind, might have contributed to erosion of the primordial atmosphere Mars (which is particularly vulnerable dissociative recombination sputtering by wind pickup ions). Spacecraft ground-based observations solar-type dwarfs in galactic clusters yielded a unified view early evolution subsequent systematic decline magnetic activity age. Rotational braking coronal ultimately quenches spin-catalyzed dynamo at heart stellar magnetism. Decay 10 6 -10 7 K corona much faster than 4 chromosphere, but XUV emissions both can be predicted reliably, photoionization key planetary atmospheric constituents modeled. The Martian (age 1 Gyr) probably was subjected rates ∼5 times contemporary peak values (sunspot maximum), possibly more if ages been underestimated.
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