Abstract
Interplanetary coronal mass ejections (ICMEs) often show unusual plasma compositional signatures (high He/P ratio, high ratio, and high Fe charge states), and their enhanced charge states of oxygen and iron are caused by flare-related heating in the corona. We investigated the abnormal plasma composition of small interplanetary magnetic flux ropes (IMFRs) in terms of He/P ratio, ratio, and mean Fe charge state. We discover that 18 of the 24 small IMFRs showed high He/P ratios. In addition, 12 and 8 of the 24 events showed high Fe charge states and ratios, respectively. This observation implies that these small IMFRs and ICMEs may be caused by the same coronal eruptions.
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