Where does solar radiation come from?

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We continue to answer questions about readers, this time they sent the following question:

By definition, radioactivity is spontaneous transformations (decay) of atomic nuclei, which are accompanied by the emission of elementary particles, electromagnetic waves or more lung nuclei. As part of the Sun, there are mainly stable hydrogen atoms, deuterium, helium-3 and helium-4; And the content of tritium and heavy radioactive elements is very small, compared with the level of radiation that the sun radiates. So where does the same radiation come from?

Radiation has various definitions in different sectors of physics, in astrophysics under radiation means the flow of ionizing radiation, that is, protons, photons, atomic nuclei, all that can ionize the substance and are born these particles not only as a result of nuclear decay.

The reaction of thermonuclear synthesis is in the sun, under which a huge number of protons and helium nuclei are ejected with huge speeds, as well as high-energy photons. These photons are capable of ionizing the substance and are the main part of solar radiation.

Under the influence of particles dropped in the reactions and radiation, protons and helium nuclei occurs from the surface of the Sun, after which they can receive additional acceleration due to strong magnetic fields of the star and go to space. This flow of particles is also part of solar radiation, but it carries a significantly smaller energy contribution to ionization than high-energy photons.