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During the spacecraft from geospace penetrating into the atmosphere, a plasma sheath can be formed around the external surface due to shock heating which subsequently leads to the interruption of radio communications between the space vehicle and ground-based stations, i.e., the blackout problem. Many techniques have been developed to mitigate the blackout problem, and the attachment chemicals releasing is considered as an effective method. Previously, halogenides and water have been widely investigated both theoretically and experimentally. In this work, we reported the mitigation of the reentry plasma sheath through releasing carbon dioxide, which reduces the electron density through different mechanisms and processes from that of the halogenides. Controlled experiments have been performed to investigate the carbon dioxide released in the arc wind tunnel and the high-frequency plasma wind tunnel. Results suggest that the electron density could be significantly decreased in the simulated plasma sheath environment, which provides a potential approach to solve the communication blackout problem encounter during the reentry processes.

Electron density depletion by releasing carbon dioxide in plasma wind tunnel