You are most likely to see Aurora Borealis in Ireland between October and April when geomagnetic activity hits 4 or above. Keep in mind that the skies need to be clear for the lights to be visible.
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Fortunately, they occur frequently. The northern lights are happening 24 hours a day, seven days a week, 365 days a year, said photographer Chad Blakely, owner of the northern lights tour company Lights Over Lapland. But that doesn't mean they're easy to spot; you need to be at the right place at the right time.