It missed us by 9 days

@Physicsgirl , correct me if I'm wrong, but it's called the magnetosphere, the thing that surrounds the Earth and protects us from the solar winds, right? If I understand this correctly, our magnetic field has been declining for millenia, and there are people who have been measuring and following this, so if our magnetic field is weakening, more of the coronal ejection mass is going to be affecting our planet in unexpected ways. Is that generally a correct understanding?