Variability of solar/stellar activity and magnetic field and its influence on planetary atmosphere evolution

摘要: It is shown that the evolution of planetary atmospheres can only be understood if one recognizes fact radiation and particle environment Sun or a planet’s host star were not always on same level as at present. New insights latest observations research regarding solar radiation, plasma solar/stellar magnetic field derived from proxies with different ages will given. We show extreme environments young Sun/stars have important implications for may responsible planets low gravity like early Mars most likely never build up dense atmosphere during first few 100 Myr after their origin. Finally we present an innovative new idea how hydrogen clouds energetic neutral atom (ENA) around transiting Earth-like exoplanets by space observatories such WSO-UV, used validating addressed atmospheric studies. Such would enhance our understanding impact activity Venus, Earth, other Solar System bodies well exoplanets.