Double flux-rope magnetic cloud in the solar wind at 1 AU

Physics – Plasma Physics

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Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Interplanetary Magnetic Fields, Space Plasma Physics: Numerical Simulation Studies

Scientific paper

We present a study of a magnetic cloud observed by Advanced Composition Explorer (ACE) in the solar wind at 1 AU on August 12, 2000. Its cross-section is obtained from magnetic field and plasma measurements by using a Grad-Shafranov reconstruction technique. This shows a configuration of asymmetric double flux ropes with a single-X point in between. Overall magnetic field and current density distributions are obtained numerically in a 2 1/2 D domain. The boundary confining the flux ropes is defined in consistency with two-dimensional, magnetohydrostatic theory. Several parameters characterizing the flux ropes are derived. A benchmark case is illustrated to validate the approach.

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