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TARA (Telescope Array Radar) is a cosmic ray radar detection experimentcolocated with Telescope Array, the conventional surface scintillation detector(SD) and fluorescence telescope detector (FD) near Delta, Utah, U.S.A. The TARAdetector combines a 40 kW, 54.1 MHz VHF transmitter and high-gain transmittingantenna which broadcasts the radar carrier over the SD array and within the FDfield of view, towards a 250 MS/s DAQ receiver. TARA has been collecting datasince 2013 with the primary goal of observing the radar signatures of extensiveair showers (EAS). Simulations indicate that echoes are expected to be short induration (~10 microseconds) and exhibit rapidly changing frequency, with rateson the order of 1 MHz/microsecond. The EAS radar cross-section (RCS) iscurrently unknown although it is the subject of over 70 years of speculation. Anovel signal search technique is described in which the expected radar echo ofa particular air shower is used as a matched filter template and compared towaveforms obtained by triggering the radar DAQ using the Telescope Arrayfluorescence detector. No evidence for the scattering of radio frequencyradiation by EAS is obtained to date. We report the first quantitative RCSupper limits using EAS that triggered the Telescope Array FluorescenceDetector.

First Upper Limits on the Radar Cross Section of Cosmic-Ray Induced Extensive Air Showers