1. The space coordinate is established which are used to describe the macroscopic instability in the ionospheric F region at mid and low latitude.

2. 16 The results mentioned above are important for studying the characteristics of low latitude ionosphere and are significant to develop an ionospheric prediction model.

3. "There were low-latitude Auroras for 9 nights in a row." During the 1770 storm, extremely bright red Auroras blanketed Japan and parts of China

4. World-wide glacial event in an ice age not only contributes to eustatic sea level changes but also penetrates to the shelf carbonate environments and sedimentation coeval low latitude area.