Longitudinal spin results from STAR

One of the main goals of the spin physics program at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory is the precise determination of the spin-dependent gluon distribution function $\Delta g$ over a wide kinematic range in the momentum fraction $x_g$ by measurements of double spin asymmetries in collisions of longitudinally polarized protons at $\sqrt{s} = 200\,\mathrm{GeV}$ and $\sqrt{s} = 500\,\mathrm{GeV}$. We report on preliminary results for the double longitudinal spin asymmetry $A_{LL}$ in inclusive jet production at $\sqrt{s} = 200\,\mathrm{GeV}$ from an integrated luminosity of about 0.5 inverse pb and beam polarizations up to 45\%. The jet transverse energies are in the range of $5 < E_T < 20\,\mathrm{GeV}$. An overview of future longitudinal STAR measurements will be presented.