A region of Earth's upper atmosphere, roughly 60 to 1000 kilometers above the surface, where solar radiation ionizes gas molecules, creating electrically charged particles. This layer reflects radio waves and plays a crucial role in global communications.
From Greek 'ion' (going, from the verb 'ienai' meaning 'to go') referring to electrically charged particles, and 'sphaira' meaning 'sphere.' The term was coined in 1926 by British physicist Robert Watson-Watt.
The ionosphere is Earth's natural radio station! This electrically charged layer bounces radio signals around the globe, making long-distance communication possible, and it's constantly changing as solar storms create space weather that can disrupt GPS systems and power grids.
Complete word intelligence in one call. Free tier — 50 lookups/day.