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Related Experiment Videos

Development of Coronal Mass Ejections: Radio Shock Signatures.

Maia, Pick, Vourlidas

    The Astrophysical Journal
    |December 10, 1999
    PubMed
    Summary

    We found evidence of weak metric radio bursts linked to the leading edge of coronal mass ejections (CMEs). These bursts travel at the same speed as CMEs, offering new insights into space weather events.

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    Acta crystallographica. Section B, Structural science·2000

    Area of Science:

    • Solar physics
    • Plasma astrophysics
    • Radio astronomy

    Background:

    • Coronal mass ejections (CMEs) are large expulsions of plasma and magnetic field from the Sun's corona.
    • Type II radio bursts are associated with shock waves driven by CMEs.
    • Previous observations have primarily focused on stronger radio emissions.

    Purpose of the Study:

    • To present observational evidence for weak metric radio bursts associated with CME leading edges.
    • To compare the velocities and positions of these radio bursts with CME leading edges.
    • To investigate the characteristics of these previously undetected radio phenomena.

    Main Methods:

    • Analysis of observational imaging data.
    • Tracking the projected velocity of radio sources across multiple frequencies.
    • Comparing radio source displacement with the CME leading edge trajectory.
    • Spectrographic data analysis to identify faint radio signals.

    Main Results:

    • Confirmed association between metric radio bursts and CME leading edges.
    • Identified similar projected velocities for radio sources and CME leading edges.
    • Observed coincident positions of the emitting radio source and the CME leading edge.
    • Detected weak bursts that are often missed in standard spectrograph data.
    • The fastest event showed a velocity exceeding 1400 km s-1 and was linked to interplanetary type II bursts.

    Conclusions:

    • Metric radio bursts are a direct observational signature of CME leading edges.
    • These bursts provide a new tool for tracking CME propagation and speed.
    • The findings enhance our understanding of radio emission mechanisms in solar eruptive events.

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