[ExI] A Geophysics problem

BillK pharos at gmail.com
Wed Sep 30 14:29:28 UTC 2015

On 30 September 2015 at 14:15, Anders Sandberg  wrote:
> The solar wind has a few atoms per cubic centimeter,
> http://hypertextbook.com/facts/2005/RandyAbbas.shtml
> giving me a rough estimate of about 10^-17 kg/m^3.
> The volume out to synchronous orbit is 4*pi*(42164e3)^3/3=3*10^23 m^3, so
> the total mass is about 3 million tons. So 2 million tons is actually
> significant... if it was an instantaneous release.
> But note that the solar wind is moving: the slow solar wind is moving about
> 400 km/s (and has twice the density as the fast), so over a year a mass of
> pi*(42164e3)^2 * 400e3 * (3600*24*365.24) * 1e-17 = 705 billion kg is moving
> past the geosynchronous orbit.
> The hydrogen "pollution" is hence neglible...
> ...unless funky interactions with the magnetosphere happens. Now, that can
> be complex because of the different locations involved. Keith's scheme would
> deposit hydrogen across the plasma sphere, van Allen belts, magnetotail and
> other structures. As a general rule the protons would tend to spiral along
> the field lines, wobbling north and south if they get trapped. I would not
> expect it to do much more than a slight increase of solar activity would do,
> but maybe if the exhaust has just the right energy to get some resonance
> they might build up, cause auroras or do something else nonlinear.
> So I would suggest talking to somebody doing space weather or aurora
> physics.

Not something I know anything about, but........    :)

Do you need to allow for the orbital speed of the earth (30 km/s)
ploughing through the solar wind?

Isn't LEO up to GSO within the magnetosphere?
So the solar wind effect will be reduced before it hits Keith's hydrogen?


More information about the extropy-chat mailing list