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Article
Open AccessAutomatic selection of Dst storms and their seasonal variations in two versions of Dst in 50 years
A computer program is developed to automatically identify the geomagnetic storms in Dst index by applying four selection criteria that minimize non-storm-like fluctuations. The program is used to identify the ...
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Article
Open AccessIntroduction to the special issue on history development of solar terrestrial sciences including auroral sub-storms
Solar terrestrial (ST) sciences started centuries ago and branched into different disciplines. Starting with naked eye to highly sophisticated novel experimental techniques, observations have revealed the secr...
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Article
Open AccessThe importance of ground magnetic data in specifying the state of magnetosphere–ionosphere coupling: a personal view
In the history of geomagnetism, geoelectricity and space science including solar terrestrial physics, ground magnetic records have been demonstrated to be a powerful tool for monitoring the levels of overall g...
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Article
Auroral electrojet oval
The auroral electrojet is enhanced in the polar ionosphere associated with charged particle precipitation and field-aligned currents during substorms. In this paper the geometry of the elctrojet is determined ...
