of;
Space;
Science;
and;
Physics,;
Shandong;
University;
at;
WeihaL;
Weihai;
264209,;
China,;
of;
Physics;
Science;
and;
lnformation;
Engineering,;
Hebei;
Normal;
University,;
Shijiazhuang;
050024,;
China;
Astronomical;
Observatories,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100012,;
China;