Reblogged from Spaceweather.com:

Oct. 29, 2021: Imagine waking up to this headline: "Half of Earth's Satellites Lost!" Impossible? It actually happened on an October day in 2003.

Turn back the clock 18 years. Solar Cycle 23 was winding down, and space weather forecasters were talking about how quiet things would soon become when, suddenly, the sun unleashed two of the strongest solar flares of the Space Age.

Quote: "the majority of [low Earth orbiting] satellites were temporarily lost, requiring several days of around-the-clock work to reestablish [their positions]." -- Beware solar flares.