SIMULATING THE EARLY SOLAR RADIATION ENVIRONMENT: X-RAY RADIATION DAMAGE EXPERIMENTS

摘要

Astrophysical studies inside the "Sun in Time" program indicate that solar-type young stars underwent highly active phases. The studied stars are single G-type stars with ages ranging from 70 million years to 9 billon years and have X-ray luminosities ranging from 1 to 1000 times that of our quiet Sun. Therefore, the proto-planetary nebula and after planetary formation the gas, dust, comets and meteoroids which travelled through interplanetary space were exposed during the period of the heavy asteroid bombardment by these large X-ray fluxes. Such high X-ray intensities should have affected the organic chemistry in the planetary nebula, organic molecules on comets, meteorites and asteroids. For getting an idea how the large X-ray fluxes or present solar Flares may have affected organic or inorganic matter in the early solar system, we plan to expose samples with comparable short wavelength radiation in the laboratory.