Abstract
Today’s Sun is a mere shadow of its former self. Four and one-half billion years ago the Sun was a fully convective, rapidly-rotating K star, with about 3 times its present radius. By all indications, it was magnetically active, with profound implications for the evolution of planetary atmospheres and the establishment of a an environment suitable for life on Earth. The Sun today retains no information on this stage of its evolution: we must explore it vicariously by observing low mass pre-main sequence (PMS) stars 4.5 billion years younger than our Sun. These studies afford the opportunity to explore what is possibly a distinctly non-solar-like dynamo.
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