Visual Aurora Borealis/Northern Lights and VHF Radio Aurora Indicators Last Updated: 09:00 UTC 

Geomagnetic Storm

 3 Kp index   12 ap index

Quiet, No Geomagnetic Storm


No Aurora

Radio Aurora Indicators

Est. daily  14  Ap index

Quiet, No Geomagnetic Storm


No Radio Aurora

Kp index information

The higher the Kp index (0-9) the greater the chance of seeing the Aurora Borealis. The three-hourly K index data is collected from ground-based magnetometers at 13 mid-latitude observatories. The scale is non-linear.
The ap index (0-400) is the equivalent three-hourly range or amplitude on a linear scale.

Ap index information

This Ap index estimate is the rolling average of the last eight ap indices: the true Ap index is the same average for the UT day. High Kp, ap & Ap indices (caused by strong solar activity) may indicate enhanced VHF radio communication (28-433 MHz) at a range of 1000 miles or more in mid- to high latitudes: the radio-aurora.

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