SRD:Greater Arcane Sight

This spell makes your eyes glow blue and allows you to see magical auras within 120 feet of you. The effect is similar to that of a detect magic spell, but arcane sight does not require concentration and discerns aura location immediately.

You know the location and power of all magical auras within your sight. An aura’s power depends on a spell’s functioning level or an item’s caster level, as noted in the description of the detect magic spell. If the items or creatures bearing the auras are in line of sight, you automatically know which spells or magical effects are active upon any individual or object you see.

If you concentrate on a specific creature within 120 feet of you as a standard action, you can determine whether it has any spellcasting or spell-like abilities, whether these are arcane or divine (spell-like abilities register as arcane), and the strength of the most powerful spell or spell-like ability the creature currently has available for use.

Greater arcane sight doesn’t let you identify magic items.

Unlike arcane sight, this spell cannot be made permanent with a permanency spell.