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Relationships of the Auroral Precipitating Particle Power with AE And Dst Indices

The data of the estimated power input (EPI) of auroral particles from NOAA/POES (Polar orbiting environmental satellite) for some 30 years have been analyzed. The annual variation of EPI shows equinox peaks, and an asymmetric activity with a higher peak in the winter-hemisphere than in the summer-hemisphere. The variation tendencies of the EPI generally coincide with aa, AE and Dst indices. Studies on the correlations of the hourly average of EPI, Pa, with AE and Dst indices show a correlation coeffcient r = 0.74 of Pa and AE and r = -r0.55 of Pa and Dst. The EPIs for north and south polar regions, NPa and SPa, show a north-south asymmetry with a higher correlation of SPa and AE (or Dst). Time delays of EPI with respect to magnetic indices are examined, the maximum correlation coeffcient of Pa with AE (r = 0.78) occurs when the time delay τ = 0, suggesting a synchronous activity of auroral electrojet and auroral precipitating particles, while τ = 1 ~ 2 hours, the correlation coeffcient of P a with Dst is maximum (r = 0.57), suggesting that the activity of auroral particle precipitation may influence the ring current to some extent.