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(Abridged). We present new high spatial resolution narrowband imagingobservations of extraplanar diffuse ionized gas (eDIG) in four late-type,actively star forming edge-on spirals, obtained with ACS on-board HST. OurF658N (H-alpha) observations reveal a multitude of structures on both small andlarge scales. Whereas all four galaxies have been studied with ground-basedtelescopes before, here the small scale structure of the extended emission linegas is presented for the first time at a spatial resolution of 0.05",corresponding to 5.0 pc at the mean distance to the target galaxies. The eDIGmorphology is very different for all four targets, probably as a result oftheir different levels of star formation activity. We find that the morphologyof the eDIG, in particular the break-up of diffuse emission into filaments ingalaxy halos, shows a strong dependence on the level of star formation activityper unit area, and eDIG can be arranged into a morphological sequence. NGC4634and NGC5775 have the highest SF rate per unit area in our sample and theobserved morphology suggests that the break-up of the smooth eDIG layer intoindividual resolved filaments occurs only above a certain threshold of SFactivity per unit area. Combined with ground-based data for samples that span alarger range of galaxy mass our results indicate that the gravitationalpotential also plays an important role in the eDIG morphology. In low-massgalaxies the gas can be expelled due to shallow gravitational potentials moreeasily and couple with strong star formation driven outflows on a local scale.This is in contrast to the more massive galaxies, which show smooth eDIGlayers, unless they are powered by a superwind, as in the case of nucleatedstarburst galaxies.

HST/ACS Observations of Star Formation Driven Outflows in Nearby Edge-on Spiral Galaxies: Dependence of Halo Morphology on Star Formation Activity