Abstract
Previously, when analyzing ULF variations of the natural electromagnetic fi according to observations in the Borok and Mondy observatories, separated by 60 degrees of longitude, longitudinal effects of geomagnetic Pc1 pulsations («pearls») were revealed. The effects were manifested themselves as a delay or advance of the beginning of the coherent Pc1 series in Borok in relation to their observation at the Mondy observatory. In 63% and 37% of cases, pulsations in Borok began later and before their detection at the Mondy observatory, respectively. The delay-advance time varied in the range from few minutes to one hour. A hypothesis is proposed about the nature of the revealed phenomenon, which directly associates these longitudinal effects with the drift motion of ring current particles, protons and antiprotons, as the source of pulsations, in the western and eastern direction, respectively. Examples illustrating the revealed effects are given. The assumption is qualitatively and quantitatively assessed.
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