Preface,-
1. Physical backgrounds and origin of the idea,-
2. Concept of the PC index,
3. Unified procedure for on-line calculation of the 1-min PCN and PCS indices,-
4. Validation of the unified procedure,-
5. Differences in summer and winter PC indices and their physical reasons,-
6. Response of PC index to sudden pulses in the solar wind dynamic pressure,-
7. PC index as an indicator of the substorm development,-
8. PC index as an indicator of the magnetic storm development,-
9. PC index as an input to monitor the disturbances in the polar ionosphere,-
10. Relationship between magnetic activity in the polar cap and atmospheric processes in the winter Antarctica,-
11. Solar wind - magnetosphere coupling in the light of the PC dynamics,- Conclusion