View Single Post
  #1   Report Post  
Old February 17th 11, 01:35 PM posted to rec.radio.shortwave
dave dave is offline
external usenet poster
 
First recorded activity by RadioBanter: Jan 2009
Posts: 5,185
Default 3 CMEs to arrive later today (tinfoil hat alert)

http://www.bbc.co.uk/news/science-environment-12493980



Solar flare eruptions set to reach Earth
By Paul Rincon Science reporter, BBC News



Scientists around the world will be watching closely as three eruptions
from the Sun reach the Earth over Thursday and Friday.

These "coronal mass ejections" will slam into the Earth's magnetic shield.

The waves of charged solar particles are the result of three solar
flares directed at Earth in recent days, including the most powerful
since 2006.

The biggest flares can disrupt technology, including power grids,
communications systems and satellites.

The northern lights (Aurora Borealis) may also be visible further south
than is normally the case - including from northern parts of the UK.

"Our current view is that the effect of the solar flare is likely to
reach Earth later today (Thursday GMT), possibly tomorrow morning," said
Alan Thomson, head of geomagnetism at the British Geological Survey (BGS).

He told BBC News: "In the scientific community, there's a feeling that
it's not as intense as we first thought it might be. But it's possible
still that it could be a large enough event for us to see the northern
lights in the UK."

However, weather forecasts suggested cloudy conditions could mar views
of any aurorae.
Technological impact

The US National Oceanographic and Atmospheric Administration (Noaa) said
that three coronal mass ejections (CMEs) were en route as the result of
solar flares on the 13, 14 and 15 February (GMT).

"The last of the three seems to be the fastest and may catch both of the
forerunners about mid-to-late day tomorrow, February 17," read a
statement from Noaa's Space Weather Prediction Center.
Aurorae The northern lights could be seen further south than is normal

The flare recorded at 0156 GMT on 15 February was the strongest such
event in four years, according to the US space agency (Nasa), which has
been monitoring activity on the Sun. The event was classified as a
so-called X-flare, the most intense type.

The source of all three events, sunspot 1158, has expanded rapidly in
recent days.

Solar flares are caused by the sudden release of magnetic energy stored
in the Sun's atmosphere.

Their effects can interfere with modern technology on Earth, such as
electrical power grids, communications systems and satellites -
including satellite navigation (or sat-nav) signals.

Although scientists are expecting most geomagnetic activity to occur on
Thursday, Chinese state media has already reported some disruption to
shortwave radio communications in the south of the country.
Awakening Sun

In 1972, a geomagnetic storm provoked by a solar flare knocked out
long-distance telephone communication across the US state of Illinois.
And in 1989, another storm plunged six million people into darkness
across the Canadian province of Quebec.

Dr Thomson said it was possible infrastructure could be affected this
time, but stressed: "The X-flare that was observed the other day was
lower in magnitude than similar flares that have been associated with
technological damage such as the loss of the Quebec power grid... and
even the large magnetic storm in 2003, which caused some damage to
satellites in orbit."

Scientists will have around half an hour's notice that the wave of
charged particles is about to hit the Earth's magnetic shield.

This is taken from the point at which a Nasa satellite called Ace (the
Advanced Composition Explorer) registers the solar radiation on its
instruments: "We're sitting waiting for that event to happen," said Dr
Thomson.