Deutsche Version

Geomagnetic Activity Indices Niemegk
of past 81 days

GFZ Potsdam | Section 2.3 | Current Data Branch

available also as [postscript] or [pdf]

  • 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; 500 nT 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 .

If you have any questions or suggestions please contact Joachim Linthe, Niemegk
GFZ Potsdam | Section 2.3 | Current Data Master
Last modified: Wed Nov 10 22:23:54 CET 2010 Martin Rother