SINCE November 1955 a magnetic observatory has been in operation at University College, Ibadan (lat. 7° 26′ N., long. 3° 54′ E.), 2° 34′ south of the magnetic equator. Between November 25 ...

Chumphon is close to the magnetic equator where plasma bubbles are expected to be generated, and is the best place to observe plasma bubbles immediately after their generation (see Figure 2).

Positions where the cylindrical radial magnetic field component vanishes were used to map the magnetic equator and reveal an offset of 484 ± 11 kilometers northward of the geographic equator. The ...