Help needed in understanding change in flux

maika

Hi guys,

I would like some help understanding how flux works. I think I am missing some basic knowledge hence I am unable to answer my hw question.

How would the flux change be calculated at the radiation belt of the earth? I am doing this for a low level electron (80keV) and therefore i know that the factor that would driving it the most is the velocity of the electron at that point.

I know that to calculate the flux the equation is mag flux = B*A where A is the area. But in this scenario, what would the area be equal to? Also, am i right in thinking that the magnetic field is constant in this case?

Thank you for your help!