| ELAYER | Strongly ionised region of upper atmosphere (1,5) |
| ROT | Southern tributary of the Danube in the region of Upper Swabia in Baden-Wurttemberg, Germany |
| OZONELAYER | Part of upper atmosphere that is gradually disappearing (5,5) |
| PLASMA | Hot ionised gas consisting of positive ions and free electrons, a conductor of electricity (6) |
| NEBULA | Interstellar cloud of dust, hydrogen, helium and other ionised gases (6) |
| STRUVE | Otto -; Russian-born US astronomer noted for his studies in stellar spectroscopy and discovery of ionised interstellar hydrogen (6) |
| AURORA | The name for the luminous phenomenon of Earth's upper atmosphere that occurs primarily in high latitudes of both hemispheres. (6) |
| EITHER | One of two I encountered in upper atmosphere |
| AETHER | The upper atmosphere, the heavens |
| STOCKY | To large number in upper atmosphere, it is sturdy (6) |
| OLIVERHEAVISIDE | English physicist who predicted the existence of an ionised gaseous layer in the upper atmosphere |
| IONOSPHERE | Ionised part of Earth's atmosphere (10) |
| INDONESIA | An ionised country of South East Asia (9) |
| IGNITION | Some sign it ionised, creating spark (8) |
| ELECTROLYTE | Ionised liquid typically used in batteries |
| ARCLAMPS | Lights that use ionised gas to produce light waves (3,5) |
| OZONE | ____ layer, region of the upper atmosphere absorbing ultraviolet radiation from the sun (5) |
| MESOSPHERE | Region of the upper atmosphere ranging from 50 to 80 km above Earth's surface |
| LAYER | Ozone ___ (area of the upper atmosphere) |
| RAT | A form of life in the upper atmosphere (3) |
