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ホーム > 刊行物 > 地磁気観測所要報 第06巻 第01号 > 地磁気観測所要報 第06巻 第01号 >External Field of Geomagnetism

地磁気観測所要報 第06巻 第01号, p.67, April, 1951


External Field of Geomagnetism


Hirayama, M.


Abstract

 In order to investigate the external field of earth magnetism, the magnetic potentials uniformly magnetized are expanded using the annual values (1922-36) at the magnetic observatories in the world. The coefficients of potential show note worthy correspondence with the relative numbers of sunspots, but the amplitudes in a solar cycle are only 10 gamma or more. On the other hand, the electron densities are reported to change by amount of about 50% in F2 layer in which the external field may be probably produced on account of low collisional frequency.
  From these results, the external field cannot be produced at least in F2 layer or below in the ionosphere.



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