[student] magnetic field on venus

In sci.space.science Adam wrote:
Hi,

If our magnetic field protects our atmosphere from being blown away by
solar winds then how come venus can maintain an atmosphere 90x the
pressure of ours without a magnetic field?

I thought gravity except Venus is less dense and smaller than Earth so
I guess thats ruled out.

Can someone help? or point me in the right direction?

Wouldn't the obvious conclusion be that protecting the atmosphere
from being "blown away" was not one of teh functions of the magnetic
field?


Thanks in advance,
Adam.

--
Sander

+++ Out of cheese error +++