A daytime region of the Earth’s ionosphere roughly between the altitudes of 90 and 160 km. E region characteristics (electron density, height, etc.) depend on the solar zenith angle and solar activity
. The ionization in the E layer is caused mainly by x-rays in the range 0.8 to 10.4 nm. (See also sporadic E.)
The region between the event horizon and the stationary limit of a rotating Kerr black hole. It is possible for a particle falling inside the ergosphere to break into two parts, one of which will fall
into the black hole and the other will come out.