  AU Mic is an active 24 Myr pre-main sequence M dwarf in the stellar
neighborhood (d$=$9.7 pc) with a rotation period of 4.86 days. The two
transiting planets orbiting AU Mic, AU Mic b and c, are warm sub-Neptunes on
8.5 and 18.9 day periods and are targets of interest for atmospheric
observations of young planets. Here we study AU Mic's unocculted starspots
using ground-based photometry and spectra in order to complement current and
future transmission spectroscopy of its planets. We gathered multi-color LCO
0.4m SBIG photometry to study the star's rotational modulations and LCO NRES
high-resolution spectra to measure the different spectral components within the
integrated spectrum of the star, parameterized by 3 spectral components and
their coverage fractions. We find AU Mic's surface has at least 2 spectral
components, a $4000\pm15$ K ambient photosphere with cool spots that have a
temperature of $3000\pm70$ K and cover $39\pm4\%$ percent of the surface,
increasing and decreasing by 5$\%$ from the average throughout a rotation. We
also detect a third flux component with a filling factor less than 0.5$\%$ and
a largely uncertain temperature that we attribute to flare flux not entirely
omitted in the time-averaged spectra. We include measurements of spot
temperature and coverage fraction from both 2- and 3- temperature models, which
we find agree with each other strongly. Our expanded use of various techniques
to study starspots will help us better understand this system and may have
applications for interpreting the transmission spectra for exoplanets
transiting stars of a wide range of activity levels.
