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  • From: Sean & Kimberly Aaron <cifn@xxxxxxxxxxxxxxxx>
  • To: CIFN LIST <cifnmedia@xxxxxxxxxxxxx>
  • Date: Wed, 29 Oct 2003 06:09:47 -0800 (PST)

Sun Shoots Another Solar Flare at Earth 
Wednesday, October 29, 2003
Scientists again warned that communications on Earth (search) could be 
disrupted this week by another spectacular eruption on the surface of the Sun 
and that it might even hamper firefighting efforts in California.

"It's headed straight for us like a freight train," said John Kohl, a solar 
astrophysicist at the Harvard-Smithsonian Center for Astrophysics (search) in 
Cambridge, Mass. "This is the real thing." 

Predictions are it could strike Earth's magnetic field by midday Wednesday. 

The explosion of gas and charged particles into space from the corona, the 
outermost layer of the sun's atmosphere, isn't harmful to people. But it can 
knock out satellite communications, which some emergency crews are relying on 
in battling California's wildfires (search). 

Similar solar events in recent years have disrupted television transmissions, 
GPS navigation, oil pipeline controls and even the flow of electricity along 
power lines. 

Space weather forecasters first warned of that possibility last week, when a 
previous solar flare erupted, and then they saw a new sunspot region developing 
in another region of the sun's face. 

The cloud of charged particles from last week's eruption struck Earth "with 
only a glancing blow," Kohl said. It disrupted some airline communications. 

But Kohl said scientists observed the biggest such explosion in 30 years 
shortly before 6 a.m. EST Tuesday. It produced a particle cloud 13 times larger 
than Earth and hurtled through the solar system at more than 1 million miles 
per hour. 

The resulting geomagnetic storm could be ranked among the most powerful of its 
kind and last for 24 hours. 

It is expected to disrupt the communications satellites and high frequency 

In southern California, wildfires already have knocked out many microwave 
communication antennas on the ground, making satellite communications important 
to emergency efforts. Researchers said safety personnel might encounter 
communications interference. 

Federal researchers said they already have turned off instruments and taken 
other precautions with science satellites. 

A positive note: strong geomagnetic storms can produce colorful auroras in the 
night sky visible as far south as Texas and Florida beginning late Wednesday. 

Sunspots and solar storms tend to occur in 11-year cycles; the current cycle 
peaked in late 2000. 

Scientists compared the latest flare to the "Bastille Day storm" that occurred 
in July 2000. 

"The Bastille Day storm produced considerable disruption to both ground and 
space high-tech systems," said Bill Murtagh, a space weather forecaster for the 
National Oceanic and Atmospheric Administration. 

Sean A. Aaron (CIFN*1)
Central Illinois Fire Network

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