1. the branch of atmospheric science that studies the upper atmosphere, especially the region above about 20 kilometers where dissociation and ionization are important
Usage: scientific

Examples

• The scientist specialized in aeronomy, studying how solar radiation affects the ionosphere.
• Aeronomy research helps us understand space weather and its impact on satellites.
• The university’s aeronomy department investigates atmospheric layers beyond the stratosphere.
• Modern aeronomy uses both ground-based instruments and spacecraft to collect data.
• Advances in aeronomy have improved our ability to predict auroral activity.
• The aeronomy conference featured presentations on mesospheric chemistry.