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We study the solar energetic particle (SEP) event associated with the 2012July 23 extreme solar storm, for which STEREO and the spacecraft at L1 providemulti-point remote sensing and in situ observations. The extreme solar storm,with a superfast shock and extremely enhanced ejecta magnetic fields observednear 1 AU at STEREO A, was caused by the combination of successive coronal massejections (CMEs). Meanwhile, energetic particles were observed by STEREO andnear-Earth spacecraft such as ACE and SOHO, suggestive of a wide longitudinalspread of the particles at 1 AU. Combining the SEP observations with in situplasma and magnetic field measurements we investigate the longitudinaldistribution of the SEP event in connection with the associated shock and CMEs.Our results underscore the complex magnetic configuration of the innerheliosphere formed by solar eruptions. The examinations of particleintensities, proton anisotropy distributions, element abundance ratios,magnetic connectivity and spectra also give important clues for the particleacceleration, transport and distribution.

Solar Energetic Particle Event Associated with the 2012 July 23 Extreme Solar Storm