lost in space
It decreases.
As the sun's rays heat up the earth, the radiation hits the atmosphere. Then the radiation heads back to the sun.
The sun.
Our Sun
Most of the solar radiation is absorbed when it reaches the surface of the earth. Some of the solar radiation is also absorbed in the atmosphere.
In the radiation zone of the Sun, electromagnetic radiation (primarily in the form of photons) is the most prevalent type of radiation. This radiation is produced by nuclear reactions in the core of the Sun and gradually makes its way towards the surface through the radiation zone.
Earth is exposed to the dangerous radiation of the sun.
Convection and radiation (internally) and radiation (externally).
UV radiation hits the earth coming from the sun.
The Sun's light (all forms of radiation from radio to heat to light to xrays are electromagnetic radiation) is radiated outward in pretty-much equal measure in all directions. Some tiny part of the Sun's radiation impacts the Earth, warming the planet, causing weather, plant growth and sunburns.
Assuming you mean electromagnetic radiation, once it leaves the Sun it will go outwards at the speed of light (300,000 kilometers per second).
radiation