Towards a Telescope Array 10 Year FD Monocular Energy Spectrum

The Telescope Array (TA) cosmic ray observatory in Millard County, Utah has passed 10 years of Fluorescence Detector (FD) operation with its 3 detector sites. These FD sites image the cascade of particles created by a cosmic ray entering the atmosphere. This cascade of particles excites the Nitrogen in the atmosphere which in turn emits UV light which is collected by the FDs. With the increased statistics of over 10 years of data, TA is working on reducing the systematic uncertainties of cosmic ray analyses. To better understand the cosmic ray events and TA’s FD responses, we introduce a new parameter, Rxmax, the distance from the FD site to the event’s Xmax along the shower core. Incorporating these methods of reducing systematic uncertainties, TA is working on a 10 year monocular energy spectrum to compare with the spectra from the Pierre Auger cosmic ray observatory and TA’s surface detectors.