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A Twisted Flux Rope Model for Coronal Mass Ejections and Two-Ribbon Flares.

Amari, Luciani, Mikic

    The Astrophysical Journal
    |December 30, 1999
    PubMed
    Summary

    We developed a new model for solar eruptions like coronal mass ejections, using twisted magnetic flux tubes. This model shows how stored magnetic energy is released, potentially explaining these powerful solar events.

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    A Magnetic Signature at Io: Initial Report from the Galileo Magnetometer

    Science (New York, N.Y.)·1996

    Area of Science:

    • Solar physics
    • Magnetohydrodynamics
    • Space weather

    Background:

    • Large-scale solar eruptive phenomena, including coronal mass ejections (CMEs) and two-ribbon flares, are driven by complex magnetic processes in the Sun's atmosphere.
    • Previous models often struggle to capture the intricate magnetic structures and energy storage mechanisms preceding these events.
    • Prominences and sigmoid structures observed in soft X-rays are key indicators of stored magnetic energy available for eruption.

    Purpose of the Study:

    • To present a novel theoretical approach for understanding solar eruptions.
    • To investigate the role of twisted magnetic flux tubes in the formation and eruption of CMEs and flares.
    • To model the magnetic configuration of prominences and overlying arcades, including S-shaped sigmoid structures.

    Main Methods:

    • Development of a highly nonlinear, three-dimensional, force-free magnetic field model.
    • Inclusion of a twisted magnetic flux rope (prominence) surrounded by an overlying arcade.
    • Analysis of the stability and energy release associated with the simulated magnetic configuration.

    Main Results:

    • Successfully created a stable, S-shaped twisted magnetic flux rope configuration, consistent with observed sigmoid structures.
    • Demonstrated that this magnetic configuration is inherently unstable and cannot remain in equilibrium.
    • Quantified significant magnetic energy release during the disruption of the modeled flux rope.

    Conclusions:

    • The proposed model provides a viable mechanism for the generation of solar eruptions.
    • The stored magnetic energy in the pre-eruptive configuration can be substantial, comparable to the energy of the open magnetic field.
    • This framework advances the theoretical understanding of energy accumulation and release in solar eruptive phenomena.

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