Geomagnetic Activity At Low Latitudes: Periodicity And Predictability

The sun has progressed past the minimum of the<br>current 11-year sunspot cycle and solar activity,<br>which is the energy source of terrestrial magnetic<br>disturbance, is on the increase. One can therefore<br>expect that human technological activities<br>affected by geomagnetic disturbance will be<br>increasingly affected during the next 3 to 7 years.<br>In geophysical surveying this effect can be<br>beneficial (e.g. magneto telluric surveying which<br>relies on the occurrence of natural geomagnetic<br>disturbance as a signal input) or detrimental<br>(aero-magnetic surveying which is adversely<br>affected by natural magnetic disturbance -<br>especially at the resolution currently being pursued).