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We show evidence of particle acceleration at GEV energies associated directlywith protons from the prompt emission of a long-duration M6-class solar flareon July 17, 2023, rather than from protons acceleration by shocks from itsassociated Coronal Mass Ejection (CME), which erupted with a speed of 1342km/s. Solar Energetic Particles (SEP) accelerated by the blast have reachedEarth, up to an almost S3 (strong) category of a radiation storm on the NOAAscale. Also, we show a temporal correlation between the fast rising of GOES-16proton and muon excess at ground level in the count rate of the New-Tupi muondetector at the central SAA region. A Monte Carlo spectral analysis based onmuon excess at New-Tupi is consistent with the acceleration of electrons andprotons (ions) up to relativistic energies (GeV energy range) in the impulsivephase of the flare. In addition, we present another two marginal particleexcesses (with low confidence) at ground-level detectors in correlation withthe solar flare prompt emission.

Prompt emission of relativistic protons up to GeV energies from M6.4-class solar flare on July 17, 2023