UVB contributes to, and is indicative of: the UV index.



The UV index measures the intensity of the solar radiation caused by the invisible spectrum.



The uvb/uv index causes a ramp up in the heat effect.




One last time here:

the temp is 95 degrees out





I pull the dragon out of the direct sun. Uv index drops off majorly.

Ambient temp drops little, couple degrees at most.



The uv index measures the amplifying effect of solar radiation caused by exposure to the sun.


High uv index induces a quick kill.





Heat kills... heat plus a high solar uv index... kills faster.




When an animal receives light from the sun it also is exposed to cosmic radiation.


Cosmic Radiation:
A stream of ionizing radiation of extraterrestrial origin, consisting chiefly of protons, alpha particles, and other atomic nuclei but including some high-energy electrons, that enters the atmosphere, collides with atomic nuclei, and produces secondary radiation, principally pions, muons, electrons, and gamma rays.



High-speed particle (atomic nucleus or electron) that travels through the Milky Way Galaxy. Some cosmic rays originate from the Sun, but most come from outside the solar system. Primary cosmic rays that reach Earth's atmosphere collide with nuclei in it, creating secondaries. Because lower-energy primaries are strongly influenced by the interplanetary magnetic field and Earth's magnetic field (see geomagnetic field), most of those detected near Earth have very high energy, corresponding to speeds about 87% that of light or more.




The sun's heat amplifying effects through direct exposure are more complicated than just saying...

the dragon was killed by the heat.




The electromagnetic radiation and particles (electrons, protons, alpha particles, and rarer heavy atomic nuclei) emitted by the Sun. The electromagnetic radiation covers a wavelength range from x-rays to radio waves, that is, from about 0.01 nanometer to 30 km. The annual mean irradiance at Earth, integrated over the whole spectrum, amounts to 1365 W · m−2, and 99% of its energy is carried by radiation with wavelengths between 278 and 4600 nm, with the maximum at 472 nm. See also Electromagnetic radiation; Solar constant.

The Sun also emits a continuous stream of particles, the solar wind, which originates in coronal holes and the upper corona. Explosive events on the Sun, the solar flares and coronal mass ejections, emit particles that are much more energetic and numerous than those of the solar wind. Solar flares are produced by the most powerful explosions, releasing energies of up to 1025 joules in 100–1000 s and high-speed electrons that emit intense radiation at radio and x-ray wavelengths. They also produce nuclear reactions in the solar atmosphere with the emission of gamma rays and of neutrons that move nearly at the speed of light. Coronal mass ejections expand away from the Sun at speeds of hundreds of kilometers per second, becoming larger than the Sun and removing up to 5 × 1013 kg of coronal material. Both events are believed to be ignited by the reconnection of magnetic fields. If the emitted particles reach the Earth, they give rise to the aurora at high latitudes, and they can damage satellites, endanger humans in space, and on the Earth disturb telecommunications and even disrupt power systems.

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