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The Surprising Power of a Solar Storm
presented by Science@NASA
Solar storms are best known for the effect they have on Arctic skies.
The aurora borealis is a wonder to behold.
Satellites, however, are finding more power up there than meets the human eye.
NASA-funded researchers say a flurry of solar storms from March 8th to 10th
dumped enough energy in Earth's upper atmosphere
to power every residence in New York City for two years.
"This was the biggest dose of heat we've received from a solar storm since 2005,"
says Martin Mlynczak of NASA Langley Research Center.
"It was a big event, and shows how solar activity can directly affect our planet."
Mlynczak is the associate principal investigator for the SABER instrument
onboard NASA's TIMED satellite.
SABER monitors infrared emissions from Earth's upper atmosphere,
in particular from carbon dioxide (CO2) and nitric oxide (NO),
two substances that play a key role in the energy balance of air
more than a hundred kilometers above our planet's surface.
"Carbon dioxide and nitric oxide are natural thermostats,"
explains James Russell of Hampton University, SABER's principal investigator.
"When the upper atmosphere (or 'thermosphere') heats up,
these molecules try as hard as they can to shed that heat back into space."
That's what happened on March 8th
when a coronal mass ejection or "CME"
propelled in our direction by an X5-class solar flare
hit Earth's magnetic field.
Energetic particles rained down on the upper atmosphere,
depositing their energy where they hit.
The action produced spectacular auroras around the poles
and significant1 upper atmospheric heating all around the globe.
"The thermosphere lit up like a Christmas tree," says Russell.
"It began to glow intensely at infrared wavelengths
as the thermostat effect kicked in."
For the three day period,
March 8th through 10th,
the thermosphere absorbed 26 billion kWh of energy.
Infrared radiation from CO2 and NO,
the two most efficient coolants in the thermosphere,
re-radiated 95% of that total back into space.
In human terms, this is a lot of energy.
According to the New York City mayor's office,
an average NY household consumes just under 4700 kWh annually.
This means the geomagnetic storm
dumped enough energy into the atmosphere
to power every home in the Big Apple for two years.
"Unfortunately, there's no practical way to harness this kind of energy," says Mlynczak.
"It's so diffuse and out of reach high above Earth's surface.
Plus, the majority of it has been sent back into space
by the action of CO2 and NO."
During the heating impulse,
the thermosphere puffed up like a marshmallow held over a campfire,
temporarily increasing the drag on low-orbiting satellites.
This is both good and bad.
On the one hand, extra drag helps clear space junk out of Earth orbit.
On the other hand, it decreases the lifetime of useful satellites
by bringing them closer to the day of re-entry.
The storm is over now, but Russell and Mlynczak expect more to come.
"We're just emerging from a deep solar minimum," says Russell.
"The solar cycle is gaining strength with a maximum expected in 2013."
More sunspots flinging more CMEs toward Earth
adds up to more opportunities for SABER
to study the heating effect of solar storms.
"This is a new frontier in the sun-Earth connection," says Mlynczak,
and the data we're collecting are unprecedented." For more news about the sun's surprising powers, 66 00:03:59,660 --> 00:00:00,000 visit science.nasa.gov.