February 17, 2017

Cold War inspired first launch from Poker Flat

Posted by larryohanlon

By Ned Rozell

When they launch, the four rockets now pointed northward from Poker Flat Research Range will add to the 345 that have arced over northern Alaska during the past 48 years. Recently, Chuck Deehr remembered number one.

A 45-foot NASA sounding rocket set for launch in February, 2017 at Poker Flat Research Range north of Fairbanks. Workers there wrote on the nose cone of the aurora-research rocket a frequent quote from range founder Neil Davis: “‘We’re in a building situation.’ T. Neil Davis, Feb. 1, 1932 – Dec. 10, 2016.” NASA photo.

Deehr is a retired space physicist at the Geophysical Institute. He had just earned his doctorate in 1968 when he was among those enlisted to help with the first mission from a rocket-launching pad in Chatanika, a complex that mushroomed from the muskeg in a few months.

Deehr’s job in spring 1969 was to live at the Air Force base in Fort Yukon for three weeks. From a small equipment trailer there on the Arctic Circle, he operated cameras and other equipment to record a sort of manmade aurora. The red cloud and streaks in the sky visible almost everywhere in Alaska were caused by a release of a chemical called barium from a 50-foot rocket.

Nuclear weapons had a big part in that first Alaska launch, and were the reason Poker Flat was built in less than one year by Alaska scientists, students and just-get-it-done guys rather than contractors.

To back up a bit, long before Cold War drama intervened, the late Neil Davis wanted a northern rocket-launching facility. The Geophysical Institute researcher and his colleagues were the best in the world at developing low-light television cameras to observe the aurora; they wanted to send instruments up into it without having to travel thousands of miles to existing rocket ranges.

Knowing what he wanted, Davis had chosen unoccupied land out by the Chatanika River for a facility. Fairbanks North Star Borough officials, happy for the tax revenue, leased the land to UAF for $700 per year.

Poker Flat remained a dream. Davis and the university had no money for a rocket range. But things changed when an American B-52 bomber crashed into an ice-covered bay near Thule, Greenland, in January 1968. The plane was carrying four hydrogen bombs. Bomb contents scattered on the ice, costing millions in cleanup as the radioactive waste was shipped back for disposal in the U.S.

The Danish, who were in control of Greenland, evicted the U.S. military. That included the use of a Greenland rocket range.

But military strategists had a problem only rockets could help solve. When a nuclear explosion went off in the atmosphere, disturbance to electrical fields prevented radios and radars from working. Strong auroras can do the same thing.

Military scientists had designed an experiment in which a rocket would release barium about 100 miles above Earth. The chemical would cause an artificial red aurora. They wanted to see if over-the-horizon radar could detect and track this aurora cloud. The researchers wanted to find out more about the properties that scrambled radio and radar signals, and they needed answers within a year.

There, the door opened for the Alaska scientists. A rocket range in Churchill, Manitoba, had a full schedule of launches that year. Officials knew of Davis’s plan — he had even written a Poker Flat feasibility study for NASA — so they set federal money aside for a rocket range in Alaska.

That money was not enough, and it was slow in coming. But Davis and others like Larry Sweet and Eldon Thompson started scrounging materials, including old mining cars that had been dumped in a river, steel beams from an old bridge over the Chatanika River, and a winch Sweet had seen in a Fairbanks backyard.

They started construction of the rocket range in mid-summer 1968. By March 1969, using no blueprints and labor from university staff members and students, they had enough of a facility for the launches of six rockets with barium charges.

Though the military was funding the launches, Davis and his colleagues rationalized a university group’s involvement because he and others executed their own basic research during the launches.

As those first rockets blasted off one-by-one on cold nights from March 5 to 20, 1969, Chuck Deehr tracked the red auroras with television cameras from Fort Yukon. Others did the same from the Ester Dome observatory in Fairbanks. They spoke over the phone to one another and sent their information on the aurora cloud’s whereabouts to an IBM computer on the UAF campus. From there, the location of the barium ion cloud was sent to military observers farther south in Alaska, who pointed their over-the-horizon radar at it.

Though he didn’t know the military’s results, which were classified, Deehr said the Geophysical Institute scientists delivered the red auroras, tracked their locations, and got fantastic science information.

“Everything worked,” Deehr said. “That was the amazing part.”

In the flurry of the first rockets, the ever-busy Neil Davis launched his own NASA rocket while Deehr was still at Fort Yukon. Davis, the enterprising scientist who died in December 2016, was the lead researcher of five NASA rocket missions from Poker Flat over the years. As five more blast off this winter, his legacy of a rocket range in the quiet country north of Fairbanks lives on, nearly one-half century after it started.

Ned Rozell is a science writer for the University of Alaska Fairbanks‘ Geophysical Institute. Since the late 1970s, the Geophysical Institute as provided this column free in cooperation with the UAF research community. More of Ned’s columns can be found here.

Follow Ned Rozell on Twitter @NedRozell  and on Instagram @neddybaseball