Checking the Alaskan data stations on my laptop, I saw that geomagnetic activity was negligible.

It occurred during an extended period of strong geomagnetic activity in solar cycle 12.

The A-index provides a daily average level for geomagnetic activity.

Therefore, information on their location with respect to the geomagnetic activity is of crucial importance to be able to forecast their impact.

The concentrations were recorded as a function of time, location, and solar and geomagnetic activity.

The maximum in the current solar cycle has passed, but both solar and geomagnetic activity remain high.

The effects of geomagnetic and solar activity over the long term are important factors in planning satellite missions.

In 1852 Wolf was one of four people who discovered the link between the cycle and geomagnetic activity on Earth.

The daily variations during selected days of quiet geomagnetic activity are used to determine a monthly mean.

Both events can be observed only during quiet geomagnetic activity.