In recent years there have been a number of scientific examinations, including an exhaustive study by a team from Japan. For weeks at a time the Japanese, using sophisticated cameras and instruments, studied the skies. They filmed the lights, formulated theories, but didn't prove much. There are no phosphor deposits in the area, ruling out glowing phosphorescent minerals. No methane or swamp gas.
Static electricity is another theory but, again, one without much supporting evidence.
Some of what people see in that portion of the horizon could be car lights. Right by the door. Armando told us the strangest tale he'd heard was twenty years ago from a very old man who lived in town. He'd been on a camping trip when he claimed to see a mystery light land and its occupants emerging. Creatures from outer space.