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Magnetic fields have important or dominant effects in many areas ofastrophysics, but have been very difficult to quantify. Spectropolarimetry fromGround State Alignment (GSA) has been suggested as a direct tracer of magneticfield in interstellar diffuse medium. Owing to the long life of the atoms onground states the Larmor precession in an external magnetic field imprints thedirection of the field onto the polarization of absorbing species. Thisprovides a unique tool for studies of sub-gauss magnetic fields usingpolarimetry of UV, optical and radio lines. Many spectral lines with strongsignals from GSA are in the UV band. By discerning magnetic fields in gas withdifferent dynamical properties, high spectral resolution measurement ofspectral polarization will allow the study of 3D magnetic field distributionand interstellar turbulence. GSA provides also a unique chance to map 3Ddirection of magnetic field on small scales, e.g., disks, where grain alignmentis unreliable. The range of objects suitable for studies is extremely wide andincludes magnetic fields in the interplanetary medium, in the interstellarmedium, and in circumstellar regions as well as diffuse media in extragalacticobjects.

Precision measurement of magnetic field from near to far, from fine to large scales in ISM