"Arrival of the high speed stream at Earth also coincides with a small (~1%) but rapid decrease in galactic cosmic ray flux...."
Wow, I guess that means a sufficiently increased density of protons from the sun such that 1% of the "cosmic rays" (very energetic protons and atomic nuclei) collide with them.
It's the magnetic field in the solar wind deflecting the charged cosmic rays. It is not a scattering effect from increased density.
What is talked about here is the arrival of the high speed stream, but it is not the high speed stream itself. What is important is the momentum transfer from the high speed stream to the slow stream out in front of it. This builds up to a genuine shockwave by Mar's orbit but at earth it is just a smooth increase in dynamic pressure. There's a pile up of the "frozen-in" magnetic field at this co-rotating interaction region and that field's intensity deflects the cosmic rays (and other charged particles) from certain directions at certain distances.
This is the pretty much the same mechanism as the Forbush decrease associated with coronal mass ejections.
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[ 1.8 ms ] story [ 18.2 ms ] threadWow, I guess that means a sufficiently increased density of protons from the sun such that 1% of the "cosmic rays" (very energetic protons and atomic nuclei) collide with them.
What is talked about here is the arrival of the high speed stream, but it is not the high speed stream itself. What is important is the momentum transfer from the high speed stream to the slow stream out in front of it. This builds up to a genuine shockwave by Mar's orbit but at earth it is just a smooth increase in dynamic pressure. There's a pile up of the "frozen-in" magnetic field at this co-rotating interaction region and that field's intensity deflects the cosmic rays (and other charged particles) from certain directions at certain distances.
This is the pretty much the same mechanism as the Forbush decrease associated with coronal mass ejections.