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The Telescope Array (TA) experiment is the largest detector to observeultra-high-energy cosmic rays in the northern hemisphere. The fluorescencedetectors at southern two stations of TA are newly constructed and have nowcompleted seven years of steady operation. One advantage of monocular analysisof the fluorescence detectors is a lower energy threshold for cosmic rays thanthat of other techniques like stereoscopic observations or coincidences withthe surface detector array, allowing the measurement of an energy spectrumcovering three orders of magnitude in energy. Analyzing data collected duringthose seven years, we report the energy spectrum of cosmic rays covering abroad range of energies above 10$^{17.2}$ eV measured by the fluorescencedetectors and a comparison with previously published results.

The Energy Spectrum of Cosmic Rays above 10$^{17.2}$ eV Measured by the Fluorescence Detectors of the Telescope Array Experiment in Seven Years