These are 5 position alpha-numeric codes comprising the d series. All other level II codes and descriptors are approved and maintained jointly by the alpha-numeric editorial panel (consisting of CMS, the Health Insurance Association of America, and the Blue Cross and Blue Shield Association).
Alaska: Although Alaska enjoys a high volume of aurora activity, its cruises are not often mentioned as northern lights cruises. During the Alaska cruise season, it's rarely dark enough for the lights to be visible.
Best month to see northern lights - Reykjavik Forum. Best month to see northern lights. Which Reykjavik hotels are on sale? I'm thinking of taking my wife to see the auroras for her birthday, obviously doing a bit of homework to to maximise our chance of success as I realise nothing is guaranteed.