HEX2 a success: 4-rocket aurora experiment launches from Poker Flat An experiment called HEX2 that consisted of four NASA suborbital sounding rockets, launched from Poker Flat Research Range during an aurora display over northern Alaska this morning. Each rocket emitted vapour trails in an experiment to learn more about winds associated with the aurora. Researchers saw the vapour trails from Poker Flat; about 30 miles north of Fairbanks, and aurora watchers at clear locations throughout northern Alaska should have been able to see them.