1) Atmospheric phenomenon 2) Characteristic of the dawn 3) Dawn-bright 4) Dawn-related 5) Dawnlike 6) Like the dawn 7) Of or like the dawn 8) Of the dawn Found on https://www.crosswordclues.com/clue/auroral
Au·ro'ral adjective Belonging to, or resembling, the aurora (the dawn or the northern lights); rosy. « Her cheeks suffused with an auroral blush. Longfellow. » Found on http://www.encyclo.co.uk/webster/A/147