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Related Experiment Videos

Fine Structure in Solar Flares.

Warren

    The Astrophysical Journal
    |June 20, 2000
    PubMed
    Summary
    This summary is machine-generated.

    High-resolution solar flare observations reveal plasma within numerous fine coronal structures, not isolated loops. Cooler postflare plasma appears looplike, while hotter flare plasma seems diffuse due to instrumental effects.

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    Area of Science:

    • Solar physics
    • Plasma astrophysics
    • Coronal physics

    Background:

    • Two-ribbon solar flares are significant energetic events in the solar atmosphere.
    • Previous observations often depicted flare plasma within a few large loops.

    Purpose of the Study:

    • To investigate the fine structure of solar flare plasma using high-resolution observations.
    • To compare the morphology of high-temperature flare plasma with cooler postflare plasma.

    Main Methods:

    • Utilizing data from the Transition Region and Coronal Explorer (TRACE) for high spatial resolution.
    • Employing soft X-ray telescope data from Yohkoh for complementary observations.
    • Analyzing the spatial distribution and appearance of plasma at different temperatures during flares.

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    Main Results:

    • Solar flare plasma is distributed across a multitude of fine coronal structures, not just a few isolated loops.
    • High-temperature flare plasma often appears diffuse.
    • Cooler (approximately 2 MK) postflare plasma exhibits a more distinct looplike structure.

    Conclusions:

    • The diffuse appearance of high-temperature flare plasma is likely an observational effect.
    • Instrumental temperature response and emission measure structure contribute to the observed diffuse appearance.
    • There may not be fundamental differences in plasma morphology across different temperatures during flares.