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comet tails and wind



I really have two questions today:
1. I understand that the solar wind is a stream of particles emanating from
the Sun. I have learned that it is responsible for the tail of the comet
pointing away from the sun. Does radiation pressure play any appreciable
part in the tail formation?

2. In reading about the solar wind, in my own effort to answer this, I find
statements that the wind displaces our magnetic field. This is puzzling to
me. Can anyone give a basic explanation of how this happens?

BTW, The comments about magnetic shielding were wonderful!

Thanks,