"Tesla says that the source of this energy is our Sun. He concluded that the Sun emits small particles, each carrying so small of a charge, that they move with great velocity, exceeding that of light. Tesla further states that these particles are the neutron particles. Tesla believed that these neutron particles were responsible for all radioactive reactions. Radiant matter is in tune with these neutron particles. Radiant matter is simply a re-transmitter of energy from one state to another."
https://www.nuenergy.org/nikola-tesla-radiant-energy-system/
"Solar wind is what's known as a plasma, a heated gas made up of charged particles — primarily protons and electrons, with trace amounts of heavier elements such as helium and oxygen. The amount of heavy elements and their charge state, or number of electrons, differ between the two types of wind.
"The composition and charge state of the slow solar wind is very different from that of fast solar wind," said Nicholeen Viall, a solar scientist at Goddard. "These differences imply that they came from different places on the sun.""
https://www.nasa.gov/feature/goddard/2016/swept-up-in-the-solar-wind
"about 120 hydrogen atoms in a space the size of a quart of milk.
This result confirmed a 2001 study which used Voyager 2 – about 4 billion miles away – to measure how much the solar wind had slowed by the time it arrived at the spacecraft. The slowdown, largely due to intervening interstellar medium particles, suggested a matching interstellar hydrogen density, about 120 hydrogen atoms in a quart-sized space."
https://www.nasa.gov/feature/goddard/2020/new-evidence-our-neighborhood-in-space-is-stuffed-with-hydrogen