Real time three hours K index is here (to be used in apps for example): http://www.irf.se/maggraphs/preliminary_real_time_k_index_secondary
Real time 15 minutes K index is here (to be used in apps for example): http://www.irf.se/maggraphs/preliminary_real_time_k_index_15_minutes_secondary
IRF Kiruna magnetometer page: http://www.irf.se/mag


K-indicesDeflection in nTProbability for aurora
00 - 15Low
115 - 30
230 - 60
360 - 120Medium
4120 - 210
5210 - 360
6360 - 600
7600 - 990High
8990 - 1500
91500 and more