The Middle Atmosphere and the Geospace (from the mesosphere to the exobase) are experiencing multi-decadal change due to increasing carbon dioxide. These effects have been predicted for several decades and are now becoming apparent in multiple data records. The cooling of the Middle Atmosphere and the Geospace was anticipated to result in a contraction of the atmosphere and result in a permanent reduction of density at fixed altitude. Variable solar activity complicates the assessment of Geospace change. The ongoing change has implications for the growing space economy, international space policy and law, and the space insurance industry.

We welcome papers on all topics related to Middle Atmosphere (stratosphere, mesosphere) and Geospace change: modeling of the effects of multi-decadal change, observations, and new technologies for systematic investigation of such changes. We particularly welcome contributions from members of the space industry to discuss their needs for knowledge of Geospace change.

• AE - Atmospheric and Space Electricity
• SA - SPA-Aeronomy