How Can Rocket Exhaust Make a Hole in the Ionosphere?
Rocket exhaust can make a temporary “hole” in the ionosphere by changing its chemistry. Molecules released high above Earth help positive ions recombine with free electrons, reducing the number of charged particles in a region. The word hole describes that local depletion. Air remains present, and the atmosphere has not been ripped open like fabric. Understanding the effect starts with a less visible feature of our planet: some of its upper atmosphere carries an electrical charge. Sunlight supplies much of that charge. Energetic ultraviolet radiation and X-rays can knock electrons away from atoms and molecules, leaving positive ions alongside free electrons. NOAA’s ionosphere overview places this region roughly 50 to 370 miles above Earth. Its electrical properties change with sunlight, location and solar activity. It also contains several layers with different particle densities. A rocket therefore passes through a changing environment rather than a rigid shell with a fixed thickness...
