Funding for this research was provided by:
Division of Atmospheric and Geospace Sciences (1435785, 1460179, 1433213)
National Aeronautics and Space Administration (NNX15AB87G, NNX16AO04G)
NSFC (41131065, 41574165)
Austrian Science Fund (V195-N16)
Article History
Received: 15 September 2016
Accepted: 3 April 2017
First Online: 10 April 2017
Disclosure of Potential Conflicts of Interest
: The authors declare that they have no conflicts of interest.