- #1

DaynaClarke

- 9

- 0

- Homework Statement
- Consider electron precipitating vertically into an auroral arc of area 1.0 km x 1200 km in the horizontal plane. The energy of the electrons is equal to 5 keV and the electron flux is [tex]8.0 x 10^13 m^-2 s^-1[/tex].

Determine the total particle energy into the arc, the total current flowing, and the direction of this current.

- Relevant Equations
- Electron flux = rate of flow of electrons per unit area

Current = rate of flow of electrons

**Homework Statement:**Consider electron precipitating vertically into an auroral arc of area 1.0 km x 1200 km in the horizontal plane. The energy of the electrons is equal to 5 keV and the electron flux is [tex]8.0 x 10^13 m^-2 s^-1[/tex].

Determine the total particle energy into the arc, the total current flowing, and the direction of this current.

**Homework Equations:**Electron flux = rate of flow of electrons per unit area

Current = rate of flow of electrons

So, I have this question on a past paper which I'm doing for revision, but I have no answers to see if I'm right or on the right track.

So far, I have the total particle energy flux as [tex] 4\times 10^{17} eVm^{-2}s^{-1} [/tex]. I got this by multiplying the energy of the electrons by the electron flux. But this seems far too simple?

Current is the rate of flow of electrons, so I did this:

Electron flux * Area = Rate

Rate * Electron Charge = Current

It gave me an answer of 15.36 kA. This seems pretty large, but aurorae are large so maybe it isn't too far-fetched?

I have no idea if either of these answers is correct, and I'm also not sure how to work out the direction of the current. I want to say it's the right-hand rule or something, but I don't know.