Ap index

| .eps file of image | Data used to drive models | Large Plot |

Data Description:

Vsw is the daily-averaged magnitude of the solar--wind velocity in GSM coordintates. The data were obtained from OMNIWeb. This data is based on measurements from both the WIND and ACE satellites.
Related Links and Publications

Description of Models:

AR All Ap:  This model and the data used to generate it was described in McPherron 1998, 1999. The model is a linear AR model that uses the 36 preceding daily-average values of Ap to predict Ap on a given day. The model was generated using all of the data described in these references (from the years 1932-1996).
Related Links and Publications

Solar-wind velocity measurements

ACE Satellite Page
ACE SWEPAM Instrument page
Real time ACE data at NOAA

Ap index

- McPherron, R.L., Determination of linear filters for predicting Ap during Jan. 1997, GRL, Vol. 25, No. 15, 3035, 1998
- McPherron, R.L., Predicting the Ap Index From Past Behavior and Solar Wind Velocity, Phys. Chem. Earth (C), Vol. 24, No. 1-3, 45-56, 1999.

Model 1: 


Model 2: