Mars' Magnetosphere Swells as Solar Wind Vanishes

On Christmas Day 2022, the solar wind, a constant stream of charged particles from the Sun, suddenly vanished completely for a couple of days. NASA's MAVEN spacecraft orbiting Mars detected this anomaly, which caused the Red Planet's magnetosphere to triple in size. The ionosphere also transitioned from a magnetized to an unmagnetized state. The event provided scientists with a rare opportunity to study how Mars responds when the solar wind is effectively removed, offering insights into what the planet would be like if it orbited a less "windy" star. The drop-off in the solar wind was attributed to a rare interaction between waves, with a fast-moving wave overtaking a slower one and leaving a less dense region behind.