Localized formations of the type of a one-dimensional Langmuir soliton, measuring ~25 Debye radii and with a lifetime ~104 oscillation periods, were observed in experiments on the buildup of Langmuir oscillations by an external electric field in artifically produced density "wells" of a magnetized collisionless plasma.
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![](/ps/1806/article_27591_800_head.png "<b>Localized formations of the type of a one-dimensional Langmuir soliton, measuring ~25 Debye radii and with a lifetime ~10<sup>4</sup> oscillation periods, were observed in experiments on the buildup of Langmuir oscillations by an external electric field in artifically produced density "wells" of a magnetized collisionless plasma.</b>")