On slide 5-50, the sudden commencement in the H trace over Honolulu measures roughly 50 nT. Estimate the additional current (I) at the nose of the magnetopause necessary to produce such an effect on the surface of the Earth. Assume the sunward magnetopause is located at L = 10. Hint: From E&M we know the magnetic field generated around a current carrying wire is given by B[r] = Ho 1/ (2n r), where l is the current and r is the radial distance away from the wire.

On slide 5-50, the sudden commencement in the H trace over Honolulu measures roughly 50 nT. Estimate the additional current (I) at the nose of the magnetopause necessary to produce such an effect on the surface of the Earth. Assume the sunward magnetopause is located at L = 10. Hint: From E&M we know the magnetic field generated around a current carrying wire is given by B[r] = Ho 1/ (2n r), where l is the current and r is the radial distance away from the wire.