USAnumber1

Thank you for a very concise post! When you say "it is a question of which nuclear reactions are possible" you mean if the energy of the cosmic ray is high enough and/or which particles is needed for one specific reaction, right?

Hello everyone! Let me begin with that I am not a student in physics, this is just of general interest. Everytime when I read about cosmic rays and transmutation, the only examples coming up are changes in the Earth's atmosphere. Look at this for example http://en.wikipedia.org/wiki/Cosmic_ray#Changes_in_atmospheric_chemistry My questions are: -Are there any limits on which atoms cosmic rays can transmutate? -Is the earths magnetic field limiting the reaction products of cosmic rays? -How about in space, are there any limitations there?