Magneto Gram Sundsvall. Larger deviations in the magnetic field gives rise to more northern lights. Bz (green) must be below the line (minusladdat) Northern lights to be seen. Source.
Magneto Gram Sundsvall. kupotoka kubwa katika uwanja magnetic inatoa kupanda kwa taa zaidi ya kaskazini. Bz (kijani) atakuwa chini ya mstari wa (minusladdat) kwa taa ya Kaskazini kuonekana. chanzo.