Carl G Schmitt, National Center for Atmospheric Research, NESL-MMM, Boulder, CO, United States, Martin Stuefer, University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States, Juan Jose Zuñiga Negron, Universidad Nacional San Antonio Abad del Cusco, Cusco, Peru, Maxwell Rado, UNSAAC, Cusco, Peru and Julio Warthon, University San Antonio Abad, Physics, Cusco, Peru