Advancements of the studies on the relationships between air temperature and solar activity with diseases;

The oscillation modes in the atmospheric stratosphere and its relationship with solar activity;

Quasi-periodic fluctuations of solar activity in scale of thousand years;

Solar activities as main sources of disturbances in the system may be divided into two groups: gradual activities and explosive activities.

Floods rather frequently occur in the region of the Poyang Lake: among the years 1755 to 2008,which are about 23 cycles of solar activities,the fraction with flood occurrences is 39.