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A detailed comparison of HERA data at low Bjorken-$x$ and lowfour-momentum-transfer squared, $Q^2$, with predictions based on $\ln{Q^2}$evolution (DGLAP) in perturbative Quantum Chromo Dynamics suggests inadequaciesof this framework. The standard DGLAP evolution was augmented by including anadditional higher-twist term in the description of the longitudinal structurefunction, $F_{\rm L}$. This additional term, $F_{\rm L}~A_{\rm L}^{\rmHT}/Q^2$, improves the description of the reduced cross sections significantly.The resulting predictions for $F_{\rm L}$ suggest that further corrections arerequired for $Q^2$ less than about 2 GeV$^2$.

Study of HERA ep Data at Low Q^2 and Low x_Bj and the Need for Higher-Twist Corrections to Standard pQCD Fits