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03 Feb 17
21:08
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Date Joined:
29 Sep 10
http://www.bbc.co.uk/news/science-environment-38849147
More Aurora Borealis, Northern Lights for sightseeing? Nothing at all to do with global warming. keep recycling and going on a jumbo jet for your holidays.
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In this case the magnetic field was breached for only two hours and then returned back to normal. The magnetic field strength reduced only by 2%," Dr Sunil Gupta, lead scientist at the CRL told the BBC.
Earth's magnetic shield, or magnetosphere, extends over a radius of a million kilometres. It protects the planet's biosphere from the continuous flow of solar and other cosmic radiation.
The Sun periodically ejects vast clouds of charged particles into space in events known as coronal mass ejections (CMEs). Each one can contain a billion tonnes of charged gas, or plasma.
The giant cloud of plasma ejected from the solar corona in 2015 caused massive compression of the Earth's magnetosphere and triggered a severe geomagnetic storm. In turn, this generated aurora borealis (northern lights), and radio signal blackouts in many high latitude countries.
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Solar winds increased to 800 from 400 last month. Solar minimum makes the sun unpredictable. The 1972 - 2000 rate was also a solar minimum. Carrington event could happen again.
More Aurora Borealis, Northern Lights for sightseeing? Nothing at all to do with global warming. keep recycling and going on a jumbo jet for your holidays.
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In this case the magnetic field was breached for only two hours and then returned back to normal. The magnetic field strength reduced only by 2%," Dr Sunil Gupta, lead scientist at the CRL told the BBC.
Earth's magnetic shield, or magnetosphere, extends over a radius of a million kilometres. It protects the planet's biosphere from the continuous flow of solar and other cosmic radiation.
The Sun periodically ejects vast clouds of charged particles into space in events known as coronal mass ejections (CMEs). Each one can contain a billion tonnes of charged gas, or plasma.
The giant cloud of plasma ejected from the solar corona in 2015 caused massive compression of the Earth's magnetosphere and triggered a severe geomagnetic storm. In turn, this generated aurora borealis (northern lights), and radio signal blackouts in many high latitude countries.
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Solar winds increased to 800 from 400 last month. Solar minimum makes the sun unpredictable. The 1972 - 2000 rate was also a solar minimum. Carrington event could happen again.
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Oddly enough I used to worry about this. The Earth's magnetic field switches - roughly about every 750,000 years. This is recorded in the stripes of reverse and normal magnetism in mid-ocean basalts, erupted through plate-tectonic sea-floor spreading. The molten core is responsible for this magnetic field - Mars has a solid core and in the absence of an associated magnetic field the solar wind has stripped the atmosphere and most water. Over the past 150 years the field has been decreasing at a significant rate. I was concerned that we may be exposed to the destructive solar wind but ... One patch may have reversed already, the South Atlantic Anomaly. It seems the magnetic field switches in a patchwork fashion, so we are not subject to periods of no protection. Rest easy my friends. Briefly.
I had undergraduate geophysical lectures from the man who first noticed this reverse/normal striping of oceanic basalts - Prof Ron Mason. Sadly he was not the (famous) first to figure out the significance - always thought his dying words were probably "Oh, bugger ...". |