1. The problem statement, all variables and given/known data 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 2. Relevant equations <V> = [6*E/(qBo*L*Re)](0,35 + 0.15sin(a)) 3. 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!