About 99% of the matter in the observable universe is in the plasma state,
In our solar system, the Sun, the interplanetary medium, the magnetospheres and ionospheres of the Earth and other planets, as well as the ionospheres of comets and certain planetary moons all consist of plasmas.
While the temperatures of the "cooler" plasmas of the ionosphere and plasma sphere are typically given in degrees Kelvin, those of the "hotter" magnetospheric plasmas are more commonly expressed in terms of the average kinetic energies of their constituent particles measured in "electron volts."
As a rule of thumb, plasmas with temperatures less than about 100 eV are "cold," while those with temperatures ranging from 100 eV to 30 keV can be considered "hot." (Particles with higher energies--such as those that populate the radiation belt--are termed "energetic.")