Space Weather
The Bz component of the initial CME is strongly positive at +15nT, so don't expect much auroral activity to start with (for anyone with darkness at this time). For strong aurora, the Bz, or magnetic component, needs to be the opposite polarity of Earth's magnetic field - meaning it must be negative.
Let's hope that the following CMEs, which are pancaked behind, will have some negative Bz.














