AbstractMany physical processes precede and accompany the solar energetic particles (SEP) occurrence on the Earth’s orbit. Explosive energy release on the Sun gives rise to a flare and a coronal mass ejection (CME). X-ray and gamma emissions are believed to be connected with flares. Radio emission is signature of disturbances traveling through the corona and interplanetary space. Particles can gain energy both in the flare and the accompanying wave processes. The beginning of the SEP events has the advantage of being the phase most close to the time of acceleration. Influence of interplanetary transport is minimal in the case of first arriving relativistic solar protons recorded by ground based neutron monitors in so called ground-level enhancements (GLE). The early phase of the SEP events attracts attention of many scientists searching for the understanding of particle acceleration. However, they come to the opposite conclusions. While some authors find arguments for coronal mass ejections as a sole accelerator of SEPs, others prove a flare to be the SEP origin. Here, the circumstances of SEP generation for several GLEs of the 23rd solar cycle are considered. Timing of X-ray, CME, and radio emissions shows a great variety from event to event. However, the time of particle ejection from the Sun is closer to maximum of X-ray emission than to any other phenomena considered. No correlation is found between the particle fluxes and the CME characteristics.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    On the early phase of relativistic solar particle events: Are there signatures of acceleration mechanism?


    Contributors:

    Published in:

    Advances in Space Research ; 43 , 4 ; 530-536


    Publication date :

    2008-08-24


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






    ISTP: Relativistic Particle Acceleration and Global Energy Transport

    Baker, D. N. / Spence, H. E. / Blake, J. B. et al. | British Library Conference Proceedings | 1997



    RELATIVISTIC PARTICLE ACCELERATION IN A RECONNECTING CURRENT LAYER

    Oreshina, A. V. / Somov, B. V. / European Space Agency | British Library Conference Proceedings | 2005