Geomagnetic Activity Indices Niemegk of past 81 days

The K indices show the local disturbance of the earth's magnetic field. They are displayed for an 81-day period and are updated on workdays. 81 days correspond to three (synodic) rotations of the sun. During strong disturbances, a 27-day repetition tendency is observed.

The K index is a quasi-logarithmic measure of the maximum disturbance in steps of 0 to 9 for three hours (UTC) each; 500nT is the lower limit for K = 9 at Niemegk. Large indices point to a correspondingly higher penetration of corpuscular radiation.

Niemegk and Wingst are among the 13 observatories whose K indices are used to determine the planetary activity index Kp.


Profile photo of  Dr. Jürgen Matzka

Dr. Jürgen Matzka

Lindenstr. 7
Building H 1, room 101
14823 Niemegk
tel. +49 33843 624-18