Geomagnetic Ap Index

Copyright WDC C1 for STP at RAL.

Geomagnetic Ap Index (Ap Data)

The Ap index is daily, and the ap index is 3-hourly. This data is derived (along with Cp and Kp) from K readings.

Additional information available:

• Availability
• Derivation and Representation
• References
• Further Data Information