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