| This data file consists of Kp indices, Ap indices, Cp indices, C9 indices, sunspot
number, and 10.7 cm flux. The most often requested parameter of this file are the
Kp indices. These planetary indices are derived from the K indices ( a quasi-logarithmic
three-hourly measure of magnetic activity ranging from 0 for the least disturbed periods
to 9 for the most disturbed) from 12 observatories located between 46 degrees north
geomagneticlatitude and 63 degrees south geomagnetic latitude. |