  We present unique {and additional} observational evidence for the
self-generation of small-scale coherent magnetic flux rope structures in the
solar wind. Such structures with durations between 9 and 361 minutes are
identified from Wind in-situ spacecraft measurements through the Grad-Shafranov
(GS) reconstruction approach. The event occurrence counts are on the order of
3,500 per year on average and have a clear solar cycle dependence. We build a
database of small-scale magnetic flux ropes from twenty-year worth of Wind
spacecraft data. We show a power-law distribution of the wall-to-wall time
corresponding well to the inertial range turbulence, which agrees with relevant
observations and numerical simulation results. We also provide the axial
current density distribution from the GS-based observational analysis, which
yields a non-Gaussian probability density function consistent with numerical
simulation results.
