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