- #1

ExoP01

- 2

- 0

## Homework Statement

I need to calculate the drift speed, drift orbital period and current density for 1eV protons and 10eV electrons. The density is 5 cm^-3

The assumption is that it is only a grad-B drift

## Homework Equations

<V> = [6*E/(qBo*L*Re)](0,35 + 0.15sin(a))

## The Attempt at a Solution

For drift speed: I assumed that <V> = [6*E/(qBo*L*Re)](0,35 + 0.15sin(a))

Where a= pitch angle = 90 degrees, L= field line= 5 in this case and Bo is 0.35*10^-4 T for equatorial plane of Earth.

q= elementary charge.

I tried and got a wrong value for the average speed when I calculated for 1 eV (proton), the answer became too small. Where did I do wrong?

For drift orbital period:

The formula is (Td=2*pi*L*Re)/abs(V) from above, bud I need V, so this should be easy

The current density for the ring current: I actually have no idea, maybe a hint from you guys?

thanks!