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We present five epochs of near IR observations of the protoplanetary diskaround MWC 480 (HD31648) obtained with the SpeX spectrograph on NASA's InfraredTelescope Facility (IRTF) between 2007 and 2013, inclusive. Using the measuredline fluxes in the Pa beta and Br gamma lines, we found the mass accretionrates to be (1.43 - 2.61)x10^-8 Msun y^-1 and (1.81 - 2.41)x10^-8 Msun y^-1respectively, but which varied by more than 50% from epoch to epoch. Thespectral energy distribution (SED)reveals a variability of about 30% between1.5 and 10 microns during this same period of time. We investigated thevariability using of the continuum emission of the disk in using theMonte-Carlo Radiative Transfer Code (MCRT) HOCHUNK3D. We find that varying theheight of the inner rim successfully produces a change in the NIR flux, butlowers the far IR emission to levels below all measured fluxes. Because thestar exhibits bipolar flows, we utilized a structure that simulates an innerdisk wind to model the variability in the near IR, without producing fluxlevels in the far IR that are inconsistent with existing data. For this object,variable near IR emission due to such an outflow is more consistent with thedata than changing the scale height of the inner rim of the disk.

Variability of Disk Emission in Pre-Main Sequence and Related Stars IV. Investigating the Structural Changes in the Inner Disk Region of MWC 480