Source : Webster's Revised Unabridged Dictionary (1913)

Auroral \Au*ro"ral\, a.
   Belonging to, or resembling, the aurora (the dawn or the
   northern lights); rosy.

         Her cheeks suffused with an auroral blush.
                                                  --Longfellow.

Source : WordNet®

auroral
     adj 1: of or relating to the atmospheric phenomenon auroras; "a
            prominent green line in the spectrum of the auroras is
            called the `auroral line'"
     2: characteristic of the dawn; "a dim auroral glow" [syn: {aurorean}]