Magnetic helicity comparison between coronal magnetic field of an active region and interplanetary magnetic cloud

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2101 Coronal Mass Ejections (7513), 2111 Ejecta, Driver Gases, And Magnetic Clouds, 7513 Coronal Mass Ejections (2101), 7974 Solar Effects

Scientific paper

We investigate several interplanetary magnetic cloud events associated with halo coronal mass ejections to compare the content of helicity in magnetic clouds with the coronal magnetic helicity variation after coronal mass ejections occurred. We use a cylindrically symmetric constant-alpha force-free model to derive magnetic helicity of magnetic cloud events by determining the parameters as magnetic cloud orientation and radius, magnetic magnitude, and helicity sign. For the helicity of the coronal magnetic field of an active region, we also assume the linear force-free field. The result of this study provide the information whether the magnetic helicity is conserved or not between sun and near Earth (1 AU).

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