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We present the luminosity function of [OII]-emitting galaxies at a medianredshift of z=0.9, as measured in the deep spectroscopic data in the STISParallel Survey (SPS). The luminosity function shows strong evolution from thelocal value, as expected. By using random lines of sight, the SPS measurementcomplements previous deep single field studies. We calculate the density ofinferred star formation at this redshift by converting from [OII] to H-alphaline flux as a function of absolute magnitude and find rho_dot=0.043 +/- 0.014Msun/yr/Mpc^3 at a median redshift z~0.9 within the range 0.46<z<1.415 (H_0 =70 km/s/Mpc, Omega_M=0.3, Omega_Lambda=0.7. This density is consistent with a(1+z)^4 evolution in global star formation since z~1. To reconcile the densitywith similar measurements made by surveys targeting H-alpha may requiresubstantial extinction correction.Comment: 16 preprint pages including 5 figures; accepted for publication in  Ap

Emission‐Line Galaxies in the STIS Parallel Survey. II. Star Formation Density