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Stellar versus Galactic: the intensity of cosmic rays at the evolving Earth and young exoplanets around Sun-like stars
Energetic particles, such as stellar cosmic rays, produced at a heightened rate by active stars (like the young Sun) may have been important for the origin of life on Earth and other exoplanets. Here, we compare, as a function of stellar rotation rate (Ω), contributions from two distinct populations of energetic particles: stellar cosmic rays accelerated by impulsive flare events and Galactic cosmic rays. We use a 1.5D stellar wind model combined with a spatially 1D cosmic ray transport model. We formulate the evolution of ...
Rodgers-Lee, D.; Taylor, A.; Vidotto, A.; Downes, T.;
Published by: Monthly Notices of the Royal Astronomical Society Published on: 06/2021
YEAR: 2021   DOI: 10.1093/mnras/stab935
diffusion; methods: numerical; Sun: evolution; stars: magnetic field; cosmic rays; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - High Energy Astrophysical Phenomena
Subresolution activity in solar and stellar coronae from magnetic field line tangling
Rappazzo, A.~F.; Dahlburg, R.~B.; Einaudi, G.; Velli, M.;
Published by: \mnras Published on: 08/2018
YEAR: 2018   DOI: 10.1093/mnras/sty1132
Parker Data Used; MHD; turbulence; stars: activity; stars: coronae; stars: magnetic field; stars: solar-type; Astrophysics - Solar and Stellar Astrophysics