Second VarSITI General Symposium (VarSITI-2017) was held with the financial support of the Russian Foundation for Basic Research, Project No. 17-05-20306.
Baolin Tan, Wei W, Yihua Yan, Jing Huang,, <pre>Key Laboratory of Solar Activity, National Astronomical Observatories Chinese Academy of Sciences, Beijing 100012, China
</pre>, China
