Normally the solar wind flows about 300-500 km/sec but from a coronal hole, the solar wind can flow to 800 km/sec. A feature on the sun called a coronal hole is associated with strong background solar wind. Early scientists made the connection between an increase in sunspots (active regions on the sun) and an increase in the intensity and frequency of the aurora.ĭuring solar minimum, when CMEs are less likely, it is still possible to have a strong aurora. The accelerated electrons are still confined to follow the magnetic field lines of Earth but now they travel down the field line and collide with the atmosphere. All of this shaking and reconfiguring can accelerate electrons that are normally trapped within the magnetosphere. Even though much of the mass is deflected around Earth, the impact can jar the magnetosphere and shake it up, causing it to change configuration. When it reaches Earth, the magnetic field of Earth deflects much of the CME around Earth but some of the more energetic particles can enter the Earth's magnetic field or Magnetosphere. If the CME is directed toward Earth, it will take one to three days for it to travel the 150 million km (96 million miles) from sun to Earth. A CME is a billion tons of material traveling at up to 2000 km/sec (or 4.5 million miles/hour). When the sun is active (near solar maximum), it can eject large blobs of plasma called Coronal Mass Ejections (CMEs). The process of accelerating electrons into the atmosphere starts at the sun.
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