Oxygen gives off green light when it is hit 60 miles above the Earth, while at 100-200 miles, rare, all-red auroras are produced. At a minimum, the Kp level needs to be at 5+ for lights to be seen on the horizon. It is under these circumstances that the lights can be seen in the UK.”ĭepending on which gas molecules are hit and where they are in the atmosphere, different amounts of energy are released as different wavelengths of light. Solar activity is measured on a Kp scale ranging from 0-9. The arrival of a coronal mass ejections from the Sun can cause the annulus to expand, bringing the aurora to lower latitudes. Auroras usually occur in a band called the annulus (a ring about 1,865 miles across) centred on the magnetic pole. When the magnetic polarity of the solar wind is opposite to the Earth’s magnetic field, the two magnetic fields combine allowing these energetic particles to flow into the Earth’s magnetic north and south poles. Back in the day we gave gods and magical creatures credit for the Northern Lights, today we are using science to maximize. The Met Office explains: “Solar winds are charged particles that stream away from the Sun at speeds of around one million miles per hour.
Forecast lead time is an important factor when it comes to. The Northern Lights occur as a consequence of solar activity and result from collisions of charged particles in the solar wind colliding with molecules in the Earth’s upper atmosphere. As a general rule of thumb, you will want to see an HPI of at least 90.
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