Solar storms spell trouble for GPS

Recently, cjcampbell posted:

Larry Dighera wrote:

http://www.newscientisttech.com/chan...e-for-gps.html
Solar storms spell trouble for GPS

SOLAR flares can drown out GPS signals with potentially serious
consequences for airlines, emergency services, and anyone relying on
satellite navigation.

The trouble with the Chicken Littles of the world is that they cry
"Wolf!" far too often (how is that for mixing allegories?).

(rest snipped for brevity)

My sentiments, exactly.

Neil

On 26 Oct 2006 08:16:01 -0500, T o d d P a t t i s t
wrote in
:

it's an impressive rate of change.

In geological terms, it's beyond the speed of light. :-)

Bob Fry wrote:
"RR" == Ross Richardson writes:

RR What this program stated and I had read it elsewhere, is the
RR magnetic core within the earth had flipped every 200K to 700K
RR years. Geologist know how to figure this out from core
RR samples.

Not from core samples. We've come nowhere near the earth's core.
Rather, from now-solid rock that was previously molten and iron
particles free to align to the earth's magnetic field; get enough of
those samples which were molten at different geologic periods and you
can figure out the history of the earth's magnetic field.


That is what the program said. Yes, we do not bore to the center of the
earth. They even study old clay pots for clues. Still not sure how they
can infer anything from that.

--

Regards, Ross
C-172F 180HP
KSWI

Commenting on future reversal of the Earth's magnetic poles, Jim Weir wrote,
Then we need to resurrect the Tate Compass Company, who installed the
magnets in their compasses backwards so that North was South, East was
West.

This started the old saying, "He who has a Tate's is lost".

Good one! I thought I'd heard then all, but this one's new to me.

"Jim Macklin" wrote in message
...
If the core is 1,000 miles in diameter, the forces required
to actually tumble the semi-solid material, overcoming the
friction with mantle and the gyroscopic forces would be so
great that the Earth would not survive. In fact, I have a
theory.

The planet Venus orbits the Sun in the same direction as all
the other planets, but it rotates backward. I think Venus
was a wanderer and struck the Earth, knocking it into the 23
incline, slowing Venus enough to be captured in the Sun
gravity as an orbiting planet and also giving Venus its
backward rotation. This collision also created the Moon.




Interesting theory but would either planet survive such an encounter as
anything more than a asteroid belt?

On Thu, 26 Oct 2006 03:42:01 -0500, "Jim Macklin"
wrote:

Fact is the more humans learn about geology, the more we
learn we don't know.

Any body volunteering to go down there and have a look?


Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

Well as a child I saw Pat Boone, James Mason and a goose
Journey to the Center of the Earth and if you listen to
www.CoasttoCoastAM.com you'll learn that then Earth is
hollow with a big hole at the North Pole and that's where
flying saucers are based.



"Roger (K8RI)" wrote in message
...
| On Thu, 26 Oct 2006 03:42:01 -0500, "Jim Macklin"
| wrote:
|
| Fact is the more humans learn about geology, the more we
| learn we don't know.
|
| Any body volunteering to go down there and have a look?
|
|
| Roger Halstead (K8RI & ARRL life member)
| (N833R, S# CD-2 Worlds oldest Debonair)
| www.rogerhalstead.com

Bob Fry wrote:
"RR" == Ross Richardson writes:
RR What this program stated and I had read it elsewhere, is the
RR magnetic core within the earth had flipped every 200K to 700K
RR years. Geologist know how to figure this out from core
RR samples.

Not from core samples. We've come nowhere near the earth's core.
Rather, from now-solid rock that was previously molten and iron
particles free to align to the earth's magnetic field; get enough of
those samples which were molten at different geologic periods and you
can figure out the history of the earth's magnetic field.

A core sample does not come from the earth's core. It is a sample
obtained by core drilling. You can get a core sample from glaciers, or
even your own skin.

On Fri, 27 Oct 2006 02:37:23 -0500, Jim Macklin wrote:

Earth is hollow with a big hole at the North Pole and
that's where flying saucers are based.

Hmm. Do they permit practice approaches?

- Andrew

"cjcampbell" wrote in message
oups.com...

Bob Fry wrote:
"RR" == Ross Richardson writes:
RR What this program stated and I had read it elsewhere, is the
RR magnetic core within the earth had flipped every 200K to 700K
RR years. Geologist know how to figure this out from core
RR samples.

A core sample does not come from the earth's core. It is a sample
obtained by core drilling. You can get a core sample from glaciers, or
even your own skin.

I did that with a pitot tube once; took a core sample of my forehead.

Guess what they found?