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We present high-resolution echelle spectra of the irradiated Herbig-Haro jets HH 444, 445, 446, and 447 from the Keck I telescope. The structural, kinematic, and physical properties of the jets near their sources are analyzed in detail. In particular, spatio-kinematic electron density variations and evidence for excited, low-velocity entrained material are found. Despite their proximity to the massive stars in the Orionis system, the inner portions of these jets generally exhibit low-excitationdoi:10.1086/382870 fatcat:hsqycxsl3rgvfegz55gggie7zu