Tromsø Geophysical Observatory Faculty of Science and Technology UiT, The Arctic University of Norway
Geomagnetic Activity Index, Tromsø This figure tells the geomagnetic activity as observed from Tromsø (in the auroral zone) during the last 33 days. As a measure of activity, we have used an index describing the average deviation of the horizontal field component from its normal value.
TGO staff Last page update 27.Oct.2014