On the long-term evolution of the PC index
Abstract
A number of geomagnetic indices have been designed to describe the evolution of various current systems developing in the magnetosphere and ionosphere as a consequence of the interaction of the solar wind and heliospheric magnetic field. The Polar Cap (PC) index, a proxy for the electric field and convection in the polar ionosphere, has been only recently introduced (1980). We attempt here to reconstruct the PC index back to 1870, based on a correlation comparison of several geomagnetic indices (aa, AE, Dst, PC) that show common long-term behaviour, characterised by solar activity signature at Hale and Gleissberg cycles time scales.
- Publication:
-
EGU General Assembly Conference Abstracts
- Pub Date:
- April 2012
- Bibcode:
- 2012EGUGA..14.7854D