Abstract
The investigation of magnetic storms by the data of the observatories located in high latitudes has revealed at a number of stations the presence of two maxima in the diurnal variation of magnetic disturbance. The study of a vast material, in particular the magnetic observations at Tikhaya Bay for nine years, has shown the changes of magnetic disturbance in the morning and the night hours to depend on different laws. This, in its turn, gave reasons to suggest that the magnetic disturbances in the morning and the night are of different nature. The above conclusion has proved to be of great importance for the further investigation of the diurnal variations of the disturbed magnetic field in high latitudes.Moreover, one has scrutinized in detail the connection between the intensity of accidental irregular fluctuations of the magnetic field (Di), during magnetic storms and the corresponding absolute values of the horizontal component. According to the data at Tikhaya Bay, the correlation‐coefficient between these phenomena was found to be high, r = − 0.70 ± 0.04.The further investigation of the disturbed magnetic field in the same direction, from data at Tikhaya Bay, has shown that the absolute values of the horizontal component for individual quiet hours, selected from the disturbed days, are exactly the same as those on the quietest days. The reduction of the magnetic data for Dickson and Wellen has confirmed the results obtained above. This result cannot be explained from the point of view of our notions on the nature of the phenomena of Sd and Dst in the field of magnetic storms.The result of the present investigation permits the suggestion that during magnetic storms there are only accidental discrete and short‐period disturbed magnetic fields caused directly by the corpuscular streams coming from the Sun. The mean, regular variations Sd and Dst in the disturbed magnetic field do not correspond to any real, prolonged phenomena in the field of magnetic storms and are fictitious, that is, merely statistical results.
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