1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, 02138, USA
2. Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito Exterior, C. U., Coyoacán, CDMX, 04510, México
3. Comisión de Investigaciones Científicas (CIC), Provincia de Buenos Aires - Universidad Tecnológica Nacional (UTN), Colón 332, San Nicolás, Buenos Aires, Argentina
4. Department of Geophysics, College of the Geology Engineering and Geomatics, Chang’an University, Xi’an, 710064, China; and Key Laboratory of Geospace Environment, Chinese Academy of Sciences, University of Science and Technology of China, Hefei, 230026, China
5. Retired, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
6. High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307-3000, USA
7. Center of Excellence in Information Systems, Tennessee State University, Nashville, TN 37209, USA
8. Institute of Geophysics, Academy of Sciences, Praha 4, 141 31, Czech Republic