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.
Northern Lights and illuminated Teepee in Yellowknife, Northwest Territories Why Go: Areas around pristine Lake Superior in Ontario and Northern Canada's tundra back-country are prime viewing spots. Head to the town of Whitehorse within the Yukon Territory to best see the swirling lights.