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We present a flux density study of 89 millisecond pulsars (MSPs) regularlymonitored as part of the MeerKAT Pulsar Timing Array (MPTA) using the L-Bandreceiver with an approximately two week cadence between 2019-2022. For eachpulsar, we have determined the mean flux densities at each epoch in eight$\sim$97 MHz sub-bands ranging from 944 to 1625 MHz. From these we have derivedtheir modulation indices, their average and peak-to-median flux densities ineach sub-band, as well as their mean spectral indices across the entirefrequency range. We find that the vast majority of the MSPs have spectra thatare well described by a simple power law, with a mean spectral index of-1.86(6). Using the temporal variation of the flux densities we measured thestructure functions and determined the refractive scintillation timescale forseven. The structure functions provide strong evidence that the intrinsic radioluminosities of MSPs are stable. As a population, the average modulation indexat 20 cm wavelengths peaks near unity at dispersion measures (DMs) of $\sim$20pc cm$^{-3}$ and by a DM of 100 pc cm$^{-3}$ are closer to 0.2, due torefractive scintillation. We find that timing arrays can improve theirobserving efficiency by reacting to scintillation maxima, and that 20 cm FRBsurveys should prioritise highly scintillating mid-latitude regions of theGalactic sky where they will find $\sim$30% more events and bursts at greaterdistances.

Flux density monitoring of 89 millisecond pulsars with MeerKAT