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2 results for “magnetic field”.

• What Causes Auroras — and How to Predict the Next One
  Solar wind funnels down Earth's magnetic field and paints the sky at 100 km altitude. A guide to the colours, the Kp scale, and how ordinary travellers can plan to see one.
• Earth's Magnetic Field: How a Churning Core Shields the Surface
  A compass points north because the outer core is a molten iron dynamo in motion — and that same invisible field deflects the solar wind that would otherwise strip our atmosphere. Here is how it works, why magnetic north keeps wandering, and what a reversal would actually do.