"Martin Brown" wrote in message
...
On 19/02/2013 09:34, valtih1978 wrote:

every bit of the mass eventually hits the earth as nothing is "burned"
so
much as ablaited


Surface usually burns to some extent leaving a characteristic fusion crust
where melting occurred - particularly if it is an iron meteorite facing an
atmospheric plasma containing oxygen. Small stuff is usually described as
burning up on entry although in reality melting and then vapourising is
probably a more accurate description.

Most meteors you see are grain of sand sized.

I mean that small particles are easy to be stopped by atmosphere and
possess no threat. Right?

More accurately the dust ends up as micrometeorites and the mass of them
incident on the Earth is distinctly larger but highly uncertain. Wiki
gives an estimate of 30 +/- 20kT of cosmic dust per year.

http://en.wikipedia.org/wiki/Micrometeorite

A cool trick to separate the magnetite like component from the black dust
in your plastic gutters is using a high flux neodymium magnet.

It has an insignificant terminal velocity so is not threat unless you
subscribe to Hoyle & Wickramasing's panspermia flu theory.

Regards,
Martin Brown

There is a wind which forms high in the upper atmosphere and slowly, over
more than a year drops until it exists in the tropopause. A new
wind then forms in the upper atmsophere blowing in the opposite direction,
and it too falls. The whole cycle takes about 2.4 years hence it is known as
the Quasi Biennial Oscillation.

It occurred to me that if magnetised micro meteors were falling to ground,
then the magnetic field of the Earth would cause them orbit so producing the
wind. That wind would induce a magnetic fiels in the opposite direction and
cause the next layer of infalling micro meteors to rotate in the opposite
direction.

Do you know if anyone else has proposed this as a cause of the QBO?

Cheers, Alastair.