Taiwan Astroparticle Radiowave Observatory for Geo‐synchrotron Emissions
劉宗哲1*, 陳志清1, 陳勁豪1, 陳政維3, 陳丕燊1,3, 許世穎1, 黃建中1, 黃明輝2, 南智佑1, 蕭宇劭4,3, 王名儒1, 王士豪1
1物理系, 國立台灣大學, 台北, Taiwan
2能源工程系, 國立聯合大學, 苗栗, Taiwan
3梁次震宇宙學與粒子物理學中心, 國立台灣大學, 台北, Taiwan
4國家奈米中心, 新竹, Taiwan
* presenting author:tsungche liu, email:tcliu@ntu.edu.tw
TAROGE is an antenna array on the high mountains of Taiwan’s east coast for the detection of ultra‐high energy cosmic ray (UHECR) in an energy round 10^19 eV. The antennas will point toward the ocean to detect radiowave signals emitted by the UHECR‐induced air‐shower as a result of its interaction with the geomagnetic field. Looking down from the coastal mountain, the effective area is enhanced by
collecting both direct‐emission as well as the ocean‐reflected signals. This instrument also provides the capability of detecting Earth‐skimming tau‐neutrino through its subsequent tau‐decay induced shower. A prototype station with 12 log‐periodic dipole array antennas for 110‐300MHz was successfully built at 1000 m elevation near Heping township in July 2014 to prove the detection concept. It has been operating smoothly for radio survey and optimization of instrumental parameters. We also built another station with 6 dual polarization antennas on a higher mountain in Dec 2015. In this report, we discuss the design of TAROGE, the performance of the stations, and the future prospect.

Keywords: cosmicray, radiowave, neutrino