Terminology for ejecta in the solar wind



Scientific words are used to communicate, think, and reason, as well as to organize, store, and retrieve information. As knowledge grows, new words are introduced and some words are abandoned. What should one call the interplanetary objects that are ejected from the Sun, travel from the Sun to Earth in 2 to 4 days, and take about a day to sweep past Earth? The existence of these objects was postulated to explain a class of geomagnetic storms. Lindemann [1919] hypothesized that a “cloud” of neutral hydrogen is accelerated away from the Sun and gradually becomes ionized to form a “plasma cloud.” The plasma cloud produces the geomagnetic storm by transferring energy and momentum from the Sun to Earth. Lindemann's plasma clouds did not contain magnetic fields.