Earth's magnetic field may have been weaker billions of years ago

Earth's weak magnetic field helped Sun to steal water from planet's
early atmosphere - Oneindia News
"Scientists have discovered that the Earth's magnetic field 3.5 billion
years ago was only half as strong as it is today, and that this
weakness, coupled with a strong wind of energetic particles from the
young Sun, likely stripped water from the early Earth's atmosphere."
http://news.oneindia.in/2010/03/05/e...eal-water.html

On Mar 6, 6:44*am, Yousuf Khan wrote:
Earth's weak magnetic field helped Sun to steal water from planet's
early atmosphere - Oneindia News
"Scientists have discovered that the Earth's magnetic field 3.5 billion
years ago was only half as strong as it is today, and that this
weakness, coupled with a strong wind of energetic particles from the
young Sun, likely stripped water from the early Earth's atmosphere."http://news.oneindia.in/2010/03/05/earthsweak-magnetic-field-helped-s...

Then why are we still in the cycle of losing our protective
geomagnetic force and its magnetosphere at roughly 0.1%/year?

~ BG

Dear Brad Guth:

On Mar 7, 1:02*pm, Brad Guth wrote:
On Mar 6, 6:44*am, Yousuf Khan wrote:

Earth's weak magnetic field helped Sun to steal water
from planet's early atmosphere - Oneindia News
"Scientists have discovered that the Earth's magnetic
field 3.5 billion years ago was only half as strong as
it is today, and that this weakness, coupled with a
strong wind of energetic particles from the young Sun,
likely stripped water from the early Earth's atmosphere.
snip link now broken by Google.Groups

Then why are we still in the cycle of losing our
protective geomagnetic force and its
magnetosphere at roughly 0.1%/year?

What is increased, can decrease again.

David A. Smith

Brad Guth wrote:
On Mar 6, 6:44 am, Yousuf Khan wrote:
Earth's weak magnetic field helped Sun to steal water from planet's
early atmosphere - Oneindia News
"Scientists have discovered that the Earth's magnetic field 3.5 billion
years ago was only half as strong as it is today, and that this
weakness, coupled with a strong wind of energetic particles from the
young Sun, likely stripped water from the early Earth's atmosphere."http://news.oneindia.in/2010/03/05/earthsweak-magnetic-field-helped-s...

Then why are we still in the cycle of losing our protective
geomagnetic force and its magnetosphere at roughly 0.1%/year?

Because that's just something you made up.

Yousuf Khan

dlzc wrote:
Dear Brad Guth:
Then why are we still in the cycle of losing our
protective geomagnetic force and its
magnetosphere at roughly 0.1%/year?

What is increased, can decrease again.

David A. Smith

Although that's possibly true, but the only person who believes that the
magnetic field is decreasing right now is Brad.

Yousuf Khan

Dear Yousuf Kahn:

On Mar 8, 6:09*am, Yousuf Khan wrote:
dlzc wrote:
Then why are we still in the cycle of losing our
protective geomagnetic force and its
magnetosphere at roughly 0.1%/year?

What is increased, can decrease again.

Although that's possibly true, but the only person
who believes that the magnetic field is decreasing
right now is Brad.

So does most of the scientific community.
http://en.wikipedia.org/wiki/Earth%2...ield_detection
http://www.windows.ucar.edu/tour/lin...h_brunhes.html
http://image.gsfc.nasa.gov/poetry/ma...magnetism.html
.... about 5% every 100 years.

But nothing monotonic about the field strength...

David A. Smith

dlzc wrote:
Dear Yousuf Kahn:

On Mar 8, 6:09 am, Yousuf Khan wrote:
Although that's possibly true, but the only person
who believes that the magnetic field is decreasing
right now is Brad.

So does most of the scientific community.
http://en.wikipedia.org/wiki/Earth%2...ield_detection
http://www.windows.ucar.edu/tour/lin...h_brunhes.html
http://image.gsfc.nasa.gov/poetry/ma...magnetism.html
... about 5% every 100 years.

But nothing monotonic about the field strength...

Oh well, then I guess I owe Brad an apology, usually his facts and
figures are pulled out of thin air.

Yousuf Khan

On Mar 7, 3:26*pm, dlzc wrote:
Dear Brad Guth:

On Mar 7, 1:02*pm, Brad Guth wrote: On Mar 6, 6:44*am, Yousuf Khan wrote:

Earth's weak magnetic field helped Sun to steal water
from planet's early atmosphere - Oneindia News
"Scientists have discovered that the Earth's magnetic
field 3.5 billion years ago was only half as strong as
it is today, and that this weakness, coupled with a
strong wind of energetic particles from the young Sun,
likely stripped water from the early Earth's atmosphere.

snip link now broken by Google.Groups



Then why are we still in the cycle of losing our
protective geomagnetic force and its
magnetosphere at roughly 0.1%/year?

What is increased, can decrease again.

David A. Smith

In other words, either way you don't care.

~ BG

On Mar 8, 5:09*am, Yousuf Khan wrote:
dlzc wrote:
Dear Brad Guth:
Then why are we still in the cycle of losing our
protective geomagnetic force and its
magnetosphere at roughly 0.1%/year?

What is increased, can decrease again.

David A. Smith

Although that's possibly true, but the only person who believes that the
magnetic field is decreasing right now is Brad.

* * * * Yousuf Khan

It's not even my science. Go figure.

~ BG

On Mar 8, 5:07*am, Yousuf Khan wrote:
Brad Guth wrote:
On Mar 6, 6:44 am, Yousuf Khan wrote:
Earth's weak magnetic field helped Sun to steal water from planet's
early atmosphere - Oneindia News
"Scientists have discovered that the Earth's magnetic field 3.5 billion
years ago was only half as strong as it is today, and that this
weakness, coupled with a strong wind of energetic particles from the
young Sun, likely stripped water from the early Earth's atmosphere."http://news.oneindia.in/2010/03/05/earthsweak-magnetic-field-helped-s...

Then why are we still in the cycle of losing our protective
geomagnetic force and its magnetosphere at roughly 0.1%/year?

Because that's just something you made up.

* * * * Yousuf Khan

My goodness, are we having another bad day. week, month, year on
Usenet?

http://www.spacedaily.com/reports/Ge..._Fail_999.html
"In the recent 20 years, the planet's magnetic field intensity has
decreased by 1.7%, and in South Atlantic by 10%. In the last two
hundred years, the Earth's magnetic field has seen a 10% decrease in
intensity."

That's the 20 year average of 0.085%/yr. 2010 could easily be 0.1%
loss.

~ BG