|Level||Effect||Physical measure||Average Frequency
(1 cycle =
Power systems: weak power
grid fluctuations can occur.
Spacecraft operations: minor impact on satellite operations possible.
Other systems: migratory animals are affected at this and higher levels; aurora is commonly visible at high latitudes (northern Michigan and Maine)**.
|Kp = 5||1700 per cycle
(900 days per cycle)
Power systems: high-latitude
power systems may experience voltage alarms, long-duration storms may
cause transformer damage.
Spacecraft operations: corrective actions to orientation may be required by ground control; possible changes in drag affect orbit predictions.
Other systems: HF radio propagation can fade at higher latitudes, and aurora has been seen as low as New York and Idaho (typically 55° geomagnetic lat.)**.
|Kp = 6||600 per cycle
(360 days per cycle)
Power systems: voltage
corrections may be required, false alarms triggered on some protection
Spacecraft operations: surface charging may occur on satellite components, drag may increase on low-Earth-orbit satellites, and corrections may be needed for orientation problems.
Other systems: intermittent satellite navigation and low-frequency radio navigation problems may occur, HF radio may be intermittent, and aurora has been seen as low as Illinois and Oregon (typically 50° geomagnetic lat.)**.
|Kp = 7||200 per cycle
(130 days per cycle)
possible widespread voltage control problems and some protective systems
will mistakenly trip out key assets from the grid.
Spacecraft Operations: may experience surface charging and tracking problems, corrections may be needed for orientation problems.
Other Systems: induced pipeline currents affect preventive measures, HF radio propagation sporadic, satellite navigation degraded for hours, low-frequency radio navigation disrupted, and aurora has been seen as low as Alabama and northern California (typically 45° geomagnetic lat.)**.
|Kp = 8, including a 9-||100 per cycle
(60 days per cycle)
Power systems: : widespread
voltage control problems and protective system problems can occur, some
grid systems may experience complete collapse or blackouts. Transformers
may experience damage.
Spacecraft operations: may experience extensive surface charging, problems with orientation, uplink/downlink and tracking satellites.
Other systems: pipeline currents can reach hundreds of amps, HF (high frequency) radio propagation may be impossible in many areas for one to two days, satellite navigation may be degraded for days, low-frequency radio navigation can be out for hours, and aurora has been seen as low as Florida and southern Texas (typically 40° geomagnetic lat.)**.
|Kp = 9||4 per cycle
(4 days per cycle)