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tokens: We would like to thank Dr Marco Milla, the director of Radio Observatorio de Jicamarca, for his help of initiating this experiment and collecting data. We thank JRO staff for performing the observations. We also thank Karim Kuyeng and Ramiro Yanque for clarifying many questions regarding these observations. JRO is a facility of the Instituto Geofisico del Peru operated with support from the National Science Foundation (NSF) grant AGS-0905448 through Cornell University. This effort was supported under NSF grants ATM 07-21613 and AGS 12-02019 to Pennsylvania State University.