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Relation between Flare-associated X-Ray Ejections and Coronal Mass Ejections.

Nitta, Akiyama

    The Astrophysical Journal
    |October 8, 1999
    PubMed
    Summary

    Researchers identified soft X-ray signatures of coronal mass ejections (CMEs) using Yohkoh SXT data. While X-ray ejections correlate with CMEs, they likely don't represent the CME front itself.

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    Area of Science:

    • Solar Physics
    • Astrophysics
    • Space Weather

    Background:

    • Coronal Mass Ejections (CMEs) are significant solar phenomena impacting space weather.
    • Directly observing CME signatures in soft X-ray wavelengths is crucial for understanding their initiation and evolution.
    • Previous studies have explored correlations between solar flares and CMEs.

    Purpose of the Study:

    • To identify direct soft X-ray signatures of coronal mass ejections (CMEs).
    • To compare Yohkoh soft X-ray telescope (SXT) observations with Solar and Heliospheric Observatory (SOHO) LASCO data for 17 limb flares.
    • To investigate the relationship between X-ray ejections and CME onset times and properties.

    Main Methods:

    • Analyzed Yohkoh SXT images for plasma ejections associated with 17 limb flares.
    • Compared SXT observations with contemporaneous data from the SOHO LASCO instrument.
    • Examined height-time relationships to estimate CME onset times relative to X-ray ejections.

    Main Results:

    • A general correlation was found between the presence of X-ray ejections and CMEs.
    • X-ray ejections likely do not represent the CME front due to CME acceleration dynamics.
    • Estimated CME onset times sometimes preceded the associated flare's impulsive phase.

    Conclusions:

    • The occurrence of flare-associated plasma ejections in X-rays may depend on open magnetic field lines, potentially created by preceding CMEs.
    • Soft X-ray observations provide valuable, though indirect, signatures of CME activity.
    • A rare observation of a CME's three-part structure preceding a major flare was presented.

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