PRELIMINARY RESULTS OF A MICROPULSATION EXPERIMENT AT CONJUGATE POINTS

This pape r summa ri zes the preliminary results ob tai ned by diffe re nt sc ienti s ts working a t the two Ins titutes on a co mmon program conce rne d mainl y with micropulsation s tudies be tween two conjuga te a reas a t a geo magne ti c la ti tude of 57°. Morphological studies and di gital co mputations of corre la tion fun c tions are made on the bas is of the chart reco rds obtai ned at the two stations . The s ignal be ing reco rded independe nt ly on mag ne ti c tape, s pec tral ana lyses a re a vailab le a lso. The principal conclu sions a re the fo llow ing: Pc 1 eve nts occur s imult aneously at the two stat ions, the amplitude be ing s tronger in the northe rn he mis phe re for the pe r iod s tud ied (J an uary and February 1964). The freque ncies of the osc illations, and more genera ll y the spectral shape of the s igna l as a fun c tion of time , a re ve ry s imilar a t the two sta tions. The tra in s of osc illations a re tim e-s hift ed be twee n the two hemis pheres by a pproxim ate ly hal f the repe tition pe riod , confirming so me othe r experim ental res ult s and excluding so me theo ri es. The co rre lation fun c tion method see ms to be ab le to give more de ta il s about the spati a l a nd tim e re lations be tween phenomena in two conjugat e areas . Some results concerning the po lariza tion a t a s ingle s tation and the phase re lat ions be t ween diffe re nt points are a lso given.

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