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Geofisica pura e applicata

, Volume 39, Issue 1, pp 96–101 | Cite as

On ionospheric disturbances in relation to geomagnetic disturbances

  • T. Nagata
Article

Summary

Disturbances in the critical frequency of theF2-region of the ionosphere at Watheroo on international magnetically disturbed days are analyzed together with simultaneous geomagnetic data at the same station. The results show that the daily average disturbanceDm (foF2) becomes negative or positive according as the maximum of the disturbance daily variationSD (foF2) takes place in night time or in daytime respectively. This fact may show that bothDm (foF2) andSD (foF2) are due to the condition that the daytime increase in the daily variation of theF2-region is reduced or enhanced owing to vertical drift of the ionosphere caused by electric currents responsible for geomagneticSD.

Keywords

Electric Current Daily Variation Critical Frequency Night Time Geomagnetic Disturbance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Istituto Geofisico Italiano 1958

Authors and Affiliations

  • T. Nagata
    • 1
  1. 1.Geophysical InstituteTokyo UniversityTokyoJapan

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