Space physics
Space physics is the study of plasmas as they occur naturally in the Earth's upper atmosphere. As such, it encompasses a far-ranging number of topics, such as heliophysics which includes the solar physics of the sun: the solar wind, planetary magnetospheres and ionospheres, auroras, cosmic rays, and synchrotron radiation. Space physics is a fundamental part of the study of space weather and has important implications not only to understanding the universe, but also to practical everyday life, including the operation of communications and weather satellites. Space physics is distinct from other fields of astrophysics which study similar phenomena, in that space physics utilizes in situ measurements from high altitude rockets and spacecraft.