Magnetic pulsation Pi2 as a sensitive indicator of magnetospheric substorm |
| |
| Authors: | T Saito K Yumoto Y Koyama |
| |
| Institution: | Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University, Sendai 980, Japan |
| |
| Abstract: | The identification of substorm onset is quite important in studying the mechanism of excitation of substorm disturbances. At present, one of the most practical methods to identify accurately the onset of substorms is to use low-latitude Pi2, which is sensitively related to the plasma instability in the magnetosphere, that triggers the substorm disturbances. This method is applied to examine the onset times of three substorm events which were already defined by various methods other than the low-latitude Pi2 method. Preceding the onset times, other evident substorm onsets are clearly determined with Pi2 onsets for all the three events by examining only the H-component of rapid-run magnetogram from a single low-latitude station in the dark hemisphere. Cooperative monitoring of Pi2 at three low-latitude stations on three well-separated meridians, therefore, is really effective in detecting most substorms. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
