IPA: /ˌɛəˈrɒnəmɪk/
KK: /ɛəˈrɒnəmɪk/
Related to the study of the upper atmosphere, especially the behavior and properties of gases in that region.
The aeronomic studies have revealed new insights into atmospheric dynamics.
Aeronomic is formed from "aero-" (from Greek "aēr", meaning air) and "-nomy" (from Greek "nomia", meaning management or distribution). The word refers to the management or study of air and its properties.
Think of 'air' ('aero-') being 'managed' or studied ('-nomy') — that's what aeronomic means.