Current sheets having a transverse scale near the electron inertial length c/ωp have been shown to be unstable using a reduced MHD description with electron inertia <Seyler and Wu, 2001>. This robust instability arises from the advection of the parallel current which lowers the magnetic energy resulting in vortex formation. The instability is localized where the parallel current shear and B⊥ are near a maximum. Observations from Freja, FAST, and CLUSTER show fluctuation enhancement in regions where current shear maximizes. The simulation spectral ratios δE/δB and δE/δn are found to be consistent with satellite data. The agreement between observations and simulations support the simulation results as the generation mechanism of BBELF (broad-band extremely low-frequency) fluctuations.