Mechanism of association between Pi 2 pulsation and magnetospheric substorm.
Abstract
Based on the analysis of the data obtained at the ground and by satellites, the following morphological characteristics of Pi2 are revealed: (1) Pi2 shows a peak amplitude at the auroral oval and a secondary maximum inside the plasmapause latitude, (2) a phase reversal of the NS-component of Pi2 exhibits both at the auroral oval and near the plasmapause latitude, (3) Pi2 occurs associated with a release of the magnetic energy in the magnetotail lobe, (4) Pi2 propagates in a compressional mode in the magnetosphere and is detected as a torsional mode on the ground. Our result obtained above leads us to a Pi2 model that the substorm-associated compressional mode of HM waves excited in the magnetotail is converted to the torsional mode of HM waves propagating along the field-line anchoring at the northern and southern auroral ovals and is observed as magnetic pulsation Pi2 on the dark hemisphere of the earth.
- Publication:
-
Journal of Atmospheric and Terrestrial Physics
- Pub Date:
- December 1976
- DOI:
- 10.1016/0021-9169(76)90135-5
- Bibcode:
- 1976JATP...38.1265S
- Keywords:
-
- Geomagnetic Pulsations;
- Magnetic Effects;
- Magnetic Storms;
- Magnetospheric Instability;
- Auroral Electrojets;
- Magnetic Signatures;
- Magnetic Variations;
- Plasmapause;
- Power Spectra;
- Propagation Modes