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Magnetic clouds (MCs), as large-scale interplanetary magnetic flux ropes, areusually still connected to the sun at both ends near 1 AU. Many researchersbelieve that all non-MC interplanetary coronal mass ejections (ICMEs) also havemagnetic flux rope structures, which are inconspicuous because the observingspacecraft crosses the flanks of the rope structures. If so, the field lines ofnon-MC ICMEs should also be usually connected to the Sun on both ends. Then wewant to know whether the field lines of most non-MC ICMEs are still connectedto the sun at both ends or not. This study examined the counterstreamingsuprathermal electron (CSE) signatures of 266 ICMEs observed by the\emph{Advanced Composition Explorer} (\emph{ACE}) spacecraft from 1998 to 2008and compared the CSE signatures of MCs and non-MC ICMEs. Results show that only10 of the 101 MC events ($9.9\%$ ) and 75 of the 171 non-MC events ($43.9\%$)have no CSEs. Moreover, 21 of the non-MC ICMEs have high CSE percentages (morethan $70\%$) and show relatively stable magnetic field components with slightrotations, which are in line with the expectations that spacecraft passesthrough the flank of magnetic flux ropes. So the 21 events may be magnetic fluxropes but the \emph{ACE} spacecraft passes through their flanks of magneticflux ropes. Considering that most other non-MC events have disordered magneticfields, we suggest that some non-MC ICMEs inherently have disordered magneticfields, namely have no magnetic flux rope structures.

Comparison of counterstreaming suprathermal electron signatures of ICMEs with and without magnetic cloud: are all ICMEs flux ropes?