Investigation of geomagnetic Pi2 pulsations on the Norilsk 160-th geomagnetic meridian (a reviev)
Abstract
In this paper we summarize the research results on irregular geomagnetic Pi2 pulsations based on material from numerous expeditions on the 160-th geomagnetic Norilsk meridian During the period from 1973 to 1995 our institute conducted experiments on investigating the fine structure of magnetospheric substorm - 10 stations located along 160 meridian in the latitude range 52-74 degrees carried out a discontinuous monitoring of the variable magnetic field of the Earth geomagnetic pulsations auroras and of the state of different atmospheric layers By performing dedicated experiments we were able to identify and investigate some new regularities in the morphology of this unique class of pulsations The study revealed three main zones of observation of these pulsations high-latitude mid-latitude and near-equatorial In high latitudes Pi2 have a primary source located in the auroral zone These pulsations are caused by variations of currents during electrojet development The source of such pulsations is located at the southern boundary of the auroral arc and undergoes latitude-longitude trends in time coincidence with the auroral dynamics The secondary source lies in the zone of plasmapause projection onto the ground and can be caused by the development of a global mode in the Earth s plasmasphere Such pulsations have a global character of excitation in mid-latitudes and their parameters spectral composition polarization and amplitude in the midnight sector of the magnetosphere depend on the latitude of substorm development In the
- Publication:
-
36th COSPAR Scientific Assembly
- Pub Date:
- 2006
- Bibcode:
- 2006cosp...36..781R