- #1

Tom-Physics

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## Homework Statement

Hi!

I have trouble with calculating the upward and downward plasma speeds. I have the necessary data and an equation that is useful (I think), but I'm stuck.

## Homework Equations

The shock jump number Zs=3 in this case , and I've calculated the shock wave speed (555 km/s), which was calculated from the plasma density. The densities are n1=30 cm^-3 and n2=90 cm^-3 if you want to know.

And now, I need the upstream and downstream plasma speeds.

## The Attempt at a Solution

I know that one equation that can be used is:

u'

_{1}/u'

_{2}==B

_{2}/B

_{1}=n

_{2}/n

_{1}Zs

Here, u'

_{1}is the upward speed and u'

_{2}the downward.

But this doesn't give me any solutions because we have two unknowns .I know that the answers should be -285 km/s and -95 km/s respectively.

I have data for the magnetic fields and proton temperatures. Can someone please help me?