Abstract
Four magnetic flux rope events observed by Advanced Composition Explorer (ACE) in the solar wind at 1 AU are examined by the Grad‐Shafranov reconstruction technique. Their 2D cross sections obtained from magnetic field and plasma measurements show configurations of multiple, nonsymmetric, cylindrical flux ropes embedded within their boundaries. Each boundary is defined in consistency with two‐dimensional magnetohydrostatic theory. Among the four events, three have double flux rope configurations, and the fourth is a triplet. Parameters characterizing the events are derived. The orientation of cylindrical axis is obtained, and associated uncertainty is estimated. All events have unidirectional axial magnetic field and axial currents. The total axial magnetic flux is of the order ∼1012 Wb, and the total axial current is of the order ∼108 A. Each flux rope in the doubled flux rope pair and the triplet has the same chirality as its partner(s). Magnetic X points are formed between adjacent flux ropes on the plane perpendicular to the cylindrical axis. One event with abrupt change in magnetic field direction and another related to energetic particles are discussed.
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