‘It looked like fireworks, until it split into four dots’: Fireball in the sky over Alaska

Goodness, gracious, great balls of fire.

By Ned Rozell

Katie Kangas operates a bed-and-breakfast in Ruby, Alaska. On the morning of Oct. 15, she turned to look out her picture window, toward the cabin next door. She was waiting for her client to switch the light on, at which point she would step out and deliver his breakfast.

Staring out into the darkness, she and her husband Ivan saw “an enormous ball of light in the sky to the west. It was moving north to south, and was quite big.”

A few hundred miles northwest, Daisy Sours was standing outside in Selawik, Alaska, at about 7:30 that morning. She saw something she never had before.

“It looked like fireworks, until it split into four dots,” she said.

[City and Trail Mix tread toward the future]

At villages in northwestern and central Alaska, from McGrath to Wainwright, people saw what scientists think was a meteorite — a rock falling from space burning up and breaking apart in the thick air surrounding Earth.

David Fee thinks it was a bolide, a fiery meteor that exploded in the atmosphere, probably above the quiet spruce swamps east of Kaltag and south of Galena.

Fee is head of the infrasound program at UAF’s Geophysical Institute. Infrasound is low-frequency noise; elephants might be able to hear it, but our ears don’t work in that range.

Scientists detect infrasound signals with microphones on spidery legs. The stations are peppered all over Alaska.

Those sensitive instruments, maintained by scientists with the Wilson Alaska Technical Center, Alaska Volcano Observatory and the Alaska Earthquake Center, allow researchers to monitor air-pressure changes, as well as low-frequency sounds.

Since the 100-plus stations were installed all over Alaska, in Antarctica and on humid islands in large expanses of blue salt water, scientists have detected nuclear explosions beneath China from as far away as Fairbanks.

Helping determine compliance with the Comprehensive Nuclear Test Ban Treaty is a large part of the Wilson Alaska Technical Center’s existence, but scientists have found the infrasound networks valuable for other things.

Fee, who is also a researcher with the Alaska Volcano Observatory, finds infrasound useful for capturing the explosive roar of volcanoes. Scientists have also detected the aurora borealis stirring the thin air above us, and the air disturbed by far-off mine explosions.

And, it turns out, infrasound is also a good tool for measuring the path of space rocks screaming through the 30-mile shell of gases surrounding our planet. An infrasound network on the UAF campus in Fairbanks recorded a clean signal of the air-pressure waves from the Oct. 15 bolide over western Alaska.

“I typically don’t work on meteors, but they are often really nice infrasound sources to help better understand the performance of our networks, and I think provide valuable information on meteors and bolides themselves,” Fee said.

Stations from all over Alaska helped Fee and his coworkers determine that the space rocks from the mid-October visitor to Earth are probably somewhere north of the upper Innoko River.

The chunks and nuggets — coated with a black “fusion crust,” the result of sizzling friction with air molecules — have now cooled to the touch. Those bits of space are now buried by snow within a quiet portion of the third rock

from the sun.

• Since the late 1970s, the University of Alaska Fairbanks’ Geophysical Institute has provided this column free in cooperation with the UAF research community. Ned Rozell is a science writer for the Geophysical Institute.

More in News

This 2020 electron microscope image provided by the National Institute of Allergy and Infectious Diseases - Rocky Mountain Laboratories shows SARS-CoV-2 virus particles which causes COVID-19, isolated from a patient in the U.S., emerging from the surface of cells cultured in a lab. On Monday, Oct. 5, 2020, the top U.S. public health agency said that coronavirus can spread greater distances through the air than 6 feet, particularly in poorly ventilated and enclosed spaces. But agency officials continued to say such spread is uncommon, and current social distancing guidelines still make sense. (NIAID-RML via AP)
COVID at a glance for Tuesday, Nov. 24

The most recent state and local numbers.

A sign seen near Twin Lakes on Sept. 17 encourages residents to wear cloth face coverings while in public. Health officials are asking Alaskans for help with contact tracing. (Ben Hohenstatt / Juneau Empire File)
Health officials seek help with virus notification

Recent surge created a contact tracing backlog.

This 2020 electron microscope image provided by the National Institute of Allergy and Infectious Diseases - Rocky Mountain Laboratories shows SARS-CoV-2 virus particles which causes COVID-19, isolated from a patient in the U.S., emerging from the surface of cells cultured in a lab. On Monday, Oct. 5, 2020, the top U.S. public health agency said that coronavirus can spread greater distances through the air than 6 feet, particularly in poorly ventilated and enclosed spaces. But agency officials continued to say such spread is uncommon, and current social distancing guidelines still make sense. (NIAID-RML via AP)
COVID at a glance for Monday, Nov. 23

The most recent state and local numbers.

It has always been a police car. (Michael Penn / Juneau Empire)
Police calls for Tuesday, Nov. 24, 2020

This report contains public information from law enforcement and public safety agencies.

This 2020 electron microscope image provided by the National Institute of Allergy and Infectious Diseases - Rocky Mountain Laboratories shows SARS-CoV-2 virus particles which causes COVID-19, isolated from a patient in the U.S., emerging from the surface of cells cultured in a lab. On Monday, Oct. 5, 2020, the top U.S. public health agency said that coronavirus can spread greater distances through the air than 6 feet, particularly in poorly ventilated and enclosed spaces. But agency officials continued to say such spread is uncommon, and current social distancing guidelines still make sense. (NIAID-RML via AP)
COVID at a glance for Saturday, Nov. 21

The most recent state and local numbers.

This July 2014 photo shows Margerie Glacier, one of many glaciers that make up Alaska’s Glacier Bay National Park. U.S. officials on Friday, Nov. 20, 2020, released details on proposed land conservation purchases for the coming year amid bipartisan objection to restrictions on how the government’s money can be spent. (AP Photo / Kathy Matheson)
Land conservation plan stirs fight over Trump restrictions

It would buy up private property inside the boundaries of Glacier Bay National Park.

This 2020 electron microscope image provided by the National Institute of Allergy and Infectious Diseases - Rocky Mountain Laboratories shows SARS-CoV-2 virus particles which causes COVID-19, isolated from a patient in the U.S., emerging from the surface of cells cultured in a lab. On Monday, Oct. 5, 2020, the top U.S. public health agency said that coronavirus can spread greater distances through the air than 6 feet, particularly in poorly ventilated and enclosed spaces. But agency officials continued to say such spread is uncommon, and current social distancing guidelines still make sense. (NIAID-RML via AP)
COVID at a glance for Friday, Nov. 20

The most recent state and local numbers.

Has it always been a police car? (Michael Penn / Juneau Empire)
Police calls for Sunday, Nov. 22, 2020

This report contains public information from law enforcement and public safety agencies.

Sherry Simpson and a BMW she loved to drive in New Mexico, where she moved after leaving Alaska. (Courtesy Photo / Scott Kiefer)
Alaska Science Forum: Remembering a gift of observation

Consider this, a closing tribute to a modest superstar.

Most Read