Analysis of periodicities in the arrival of ISD grains near 1 AU. (a) Counts of dust arrival per day in the detection region near 1 AU. (b) Wavelet spectrogram of the daily dust count data from (a), with cone of influence regions indicated in transparent gray. (c) Wavelet power spectral values averaged over the entire simulation time, as a function of oscillation period. Vertical dashed gray lines are at periodicities corresponding to the approximate solar rotation period of 27 days and its harmonics: 27/2 = 13.5 days, 27/3 = 9 days, and 27/4 = 6.75 days.