Journal of geomagnetism and geoelectricity

S_q-Field in the Polar Region on Absolutely Quiet Days

T. NAGATA, H. MIZUNO

1955 年 7 巻 3 号 p. 69-74
発行日: 1955年
公開日: 2010/09/14

DOIhttps://doi.org/10.5636/jgg.7.69

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It is proved by analyzing geomagnetic data on the quietest days during the Second Polar Year that the S-field over the whole surface of the earth on the absolutely quiet days which are defined as the days when ΣK_p=0 can be well represented by the extension of the S_q-field which has been defined by Chapman for the interzonal region of the earth. The S-field on the absolutely quiet days defined here will be called the S⁰_q-field.

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On the Disturbance Daily Variations and the Lunar Daily Variations in the F2 Region of the Ionosphere on the Magnetic Equator

Hiroshi MAEDA

1955 年 7 巻 3 号 p. 75-85
発行日: 1955年
公開日: 2010/09/14

DOIhttps://doi.org/10.5636/jgg.7.75

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The paper examines the direct effects of the vertical electron drift, due to the electric fields accompanied by electric currents producing the observed geomagnetic S_D-and L-variations, upon the F2-region of the ionosphere on the magnetic equator. It is shown that the calculated results may explain the main features of the observed disturbance daily variations (S_D(F2)) and of the observed lunar daily variations (L(F2)) in the F2-region.

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Report of Observations of Geomagnetic Variations at Aso and Naze (Amami-Oshima), during the Solar Eclipse of June 20th, 1955

Masaziro OTA, Hiroshi MAEDA, Hiromichi YASUHARA, Shoichiro HASHIZUME

1955 年 7 巻 3 号 p. 86-90
発行日: 1955年
公開日: 2010/09/14

DOIhttps://doi.org/10.5636/jgg.7.86

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Sequential E_S and Lunar Effects on the Equatorial E_S

Sadami MATSUSHITA

1955 年 7 巻 3 号 p. 91-95
発行日: 1955年
公開日: 2010/09/14

DOIhttps://doi.org/10.5636/jgg.7.91

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