  We report on the experimental observation of spontaneous creation and
annihilation of temporal cavity solitons (CSs) in a coherently-driven,
macroscopic optical fiber resonator. Specifically, we show that CSs are
spontaneously created when the frequency of the cavity driving field is tuned
across a resonance, and that they can individually disappear at different
stages of the scan. In contrast to previous experiments in monolithic
microresonators, we are able to identify these dynamics in real time, thanks to
the macroscopic dimensions of our resonator. Our experimental observations are
in excellent agreement with numerical simulations. We also discuss the
mechanisms responsible for the one-by-one disappearance of CSs.
