K-indices of 5 or greater indicate storm-level geomagnetic activity around earth.
Geomagnetic Storms: Probabilities for significant disturbances in Earth’s magnetic field are given for three activity levels: active, minor storm, severe storm. The geomagnetic storm probabilities are the estimated chances of at least one 3-hour K index, at the indicated level, for each of the next 3 days.
Active: K = 4
Minor storm: K = 5
Major or Severe storm: K > 6
The “K index” is a 3-hourly quasi-logarithmic local index of geomagnetic activity relative to an assumed quiet-day curve for the recording site. Range is from 0 to 9. The K index measures the deviation of the most disturbed horizontal component of the magnetic field.
speed: 520.9 km/sec
density: 5.0 protons/cm3
Interplanetary Mag. Field
Btotal: 9.9 nT
Bz: 6.7 nT north
Now: Kp= 5 storm
24-hr max: Kp= 5 storm
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