# What portion of the total power emitted by the Sun comes from photons?

We usually talk about luminosity, which is the total power from emitted photons. The other sources are neutrinos and the solar wind (which includes protons and other particles).

I assume that most of the emitted energy comes from photons. What portion comes from the other stuff?

• Did you try the inter web? wiki-P says in the 1st paragraph that the neutrino luminosity is 0.023 L_sun. Likewise with the solar wind: $1.3 \times 10^{36}$particles (protons) per second. Assume 145 km per second and work it out. Gravitation waves? Search for $J_2$ for the sun and use this physics.stackexchange.com/q/33132 . Please report back what you get. – JEB May 31 '18 at 17:43
• I concur with what @JEB said, but the typical (asymptotic) solar wind speed is more like ~300-400 km/s. The speed closer to the sun is, indeed, lower and it accelerates as it passes through the Alfven point (well, this is the current theory which will hopefully be tested by Parker Solar Probe). – honeste_vivere Jun 1 '18 at 13:13