It nevertheless provides a good idea of what to expect. It’s important to note that the Kp-index does not definitively predict the strength of the Northern Lights. Most often caused by powerful coronal mass ejections. Kp 9 – Intense storm – Aurorae seen around 40° latitude.Kp 8 – Severe storm – Bright, dynamic and colourful aurorae.Kp 7 – Strong storm – Bright, dynamic and colourful aurorae.Kp 6 – Moderate storm – Bright, dynamic and colourful aurora display.Kp 5 – Minor storm – Bright, constant and colourful aurora display, red and purple colours appear.Kp 4 – Active – Bright, constant and dynamic northern lights visible.Kp 3 – Unsettled – Bright auroras visible at zenith.Kp 2 – Quiet – Auroras readily visible and become brighter and more dynamic.Kp 1 – Quiet – Aurora oval over Iceland, faint and quiet aurorae visible to the unaided eye low in the northern sky. ![]() Faint aurorae visible in photographs, low in the northern sky Kp 0 – Quiet – Aurora oval mostly to the north of Iceland.The following information – from the book Your Guide to the Northern lights and night sky above Iceland (published in early 2019)– describes how different Kp-indices look like as seen from Iceland: The faster the solar wind blows, the greater the turbulence. The index ranges from 0, for low activity, to 9, which means that an intense geomagnetic storm is under way. The Kp-index describes the disturbance of the Earth’s magnetic field caused by the solar wind.
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