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The plot labelled as "Now" shows the present situation. The green zone (if any) indicates the auroral oval estimated by magnetometer recordings. Other plots show forecasts for which green indicates a high probability of auroras and light green refers to a smaller probability. In case of low activity, we use an empirical oval drawn with a grey colour. Cloudiness maps are based on FMI weather forecasts.
25.04.2018 04:46:35 UTC, rise and set times in local time
Previous new Moon: 16.04.2018 - Next full Moon: 30.04.2018
The table shows the maximum 1-min time derivative (dB/dt) of the magnetic field (north or east component) at a few magnetometer stations during the latest hour. The unit is nT/s. The activity codes are defined as follows:
0: auroras unlikely seen at the station (black dot on the first map)
1: auroras likely (red dot)
2: data missing (white dot)
They are empirically determined based on the maximum dB/dt. Sunrise, sunset, moonrise and moonset are given at an accuracy of about 1 minute. If the Sun is shining then the auroral oval just indicates the region where increased geomagnetic activity is probable.
This page is automatically created. There is only a simple automatic quality check of magnetometer data, and we cannot guarantee an error-free service.