Solar energetic particles (SEPs) provide a measurement of coronal element abundances that is highly independent of the ionization states and temperature of the ions in the source plasma. The most complete measurements come from large 'gradual' events where ambient coronal plasma is swept up by the expanding shock wave from a coronal mass ejection. Particles from 'impulsive' flares have a pattern of acceleration-induced enhancements superimposed on the coronal abundances. Particles accelerated from high-speed solar wind streams at corotating shocks show a different abundance pattern corresponding to material from coronal holes. Large variations in He/O in coronal material are seen for both gradual and impulsive-flare events but other abundance ratios, such as Mg/Ne, are remarkably constant. SEP measurements now include hundreds of events spanning 15 years of high-quality measurement.


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    Titel :

    Coronal abundances determined from energetic particles


    Beteiligte:
    Reames, D. V. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1995-07-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Coronal Abundances Determined from Energetic Particles

    Reames, D. V. / Committee on Space Research; Scientific Commission E | British Library Conference Proceedings | 1995


    Coronal Abundances Determined from Energetic Particles

    Reames, D.V. | Online Contents | 1995




    Coronal Element Abundances Derived from Solar Energetic Particles

    Reames, D. V. / COSPAR | British Library Conference Proceedings | 1994