Olaf Scholten^1,2, Joseph R Dwyer³, Steve Cummer⁴, Brian Hare^5,6, Ningyu Liu⁷, Marten Lourens⁶, Christopher Francis Francis Sterpka⁶, Paulina Turekova^5,6, S. ter Veen⁶ and Wu Bin⁸, (1)Retired, Washington, DC, United States, (2)University of Groningen, Kapteyn Institute, Groningen, Netherlands, (3)University of New Hampshire, Department of Physics and Astronomy and the Space Science Center, Durham, NH, United States, (4)Duke University, Electrical and Computer Engineering Department, Durham, United States, (5)University of Groningen, Groningen, Netherlands, (6)Netherlands Institute for Radio Astronomy, Dwingeloo, Netherlands, (7)University of New Hampshire, Department of Physics and Space Science Center, Durham, United States, (8)Chinese Academy of Meteorological Sciences, Beijing, China