Open Access
Research Article
J. Space Weather Space Clim.
Volume 9, 2019
Article Number A25
Number of page(s) 13
Published online 16 July 2019

© C. Xiong et al., Published by EDP Sciences 2019

Licence Creative CommonsThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.