  Extensive air showers induced from high-energy cosmic rays provide a window
into understanding the most energetic phenomena in the universe. We present a
new method for observing these showers using the silicon imaging detector
Subaru Hyper Suprime-Cam (HSC). This method has the advantage of being able to
measure individual secondary particles. When paired with a surface detector
array, silicon imaging detectors like Subaru HSC will be useful for studying
the properties of extensive air showers in detail. The following report
outlines the first results of observing extensive air showers with Subaru HSC.
The potential for reconstructing the incident direction of primary cosmic rays
is demonstrated and possible interdisciplinary applications are discussed.
