What would happen to earth without the magnetosphere?

Without the magnetosphere, Earth would be exposed to harmful solar and cosmic radiation, leading to increased radiation levels at the surface. This could severely impact the atmosphere, potentially stripping it away over time and making the planet inhospitable to life. Additionally, technological systems reliant on satellites and other electronics could be disrupted, leading to widespread communication and navigation failures. Overall, the loss of the magnetosphere would create a dramatically more hostile environment for both life and technology on Earth.