a) Use the figure below to estimate the magnetic field inclination at City X. b)

Question

a) Use the figure below to estimate the magnetic field inclination at City X.

b) Assuming that the Earth’s magnetic field is a dipole aligned with the geographic north-south axis, find a theoretical values for the inclination at the following locations:

i) London, UK (51N, 0E)

ii) Canberra, Australia (35S, 149E)

iii) Rio de Janeiro, Brazil (23S, 43W)

iv) City X

c) Give two reasons for the the difference between your estimate of City X's magnetic inclination in part a) and the theoretical value you obtained in part b).

Explanation / Answer

Magnetic Inclination I = arctan(2*tan)

is magnetic latitude

(a) From figure Magnetic field inclination at City X is 730

(b) Location                                                                   Magneticfield inclination I (in degrees)

i) London, UK (51N, 0E)                               66.014                

ii) Canberra, Australia (35S, 149E)                                     -65.661

iii) Rio de Janeiro, Brazil (23S, 43W)                                  -40.473

iv) City X (550N, 650 W)           74.940    

(c) The difference between estimate of City X's magnetic inclination in part a) and the theoretical value obtained in part b). is 73 - 74.940 = -1.940 degrees.                                                       

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