NEW EVIDENCE OF THE QUASI-STEADY STRUCTURES IN THE SOLAR-TERRESTRIAL COROTATING DISTURBANCES AND THEIR PHASE REVERSAL AND DRIFT

The quasi-steady structures in the corotating solar-terrestrial disturbances and their phase reversal reappear in the solar cycle 21 and 22,which confirms that the above phefiomenon found by the authors is a regular feature occurring on a time scale of one century.Moreover,the geomagnetic disturbance data covering the past one hundred years up to 1991-1992 indicated that the quasi-steady corotating structure in the even cycles tends to drift linearly in peak against solar rotation.Atentative prediction is made for the corotating disturbances which may appear in the forthcoming pre-minimum years.