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On 2017 September 10 Neutron Monitors (NMs) apparatus located at ground leveland high latitudes detected an increase in the counting rate associated tosolar energetic particles (SEPs) emission from X8.2-class solar flare and itsassociated CME. This was the second-highest flare of the current solar cycle.The origin was the active region AR 12673 when it was located at the edge ofthe west solar disk, magnetically poorly connected with Earth. However, therewas a peculiar condition: the solar protons accelerated by the CME shocks wereinjected within a heliospheric current sheet (HCS) region when Earth wascrossing this region. We show that often HCS and SEPs propagation are closelyrelated. If the source locations of SEPs are within or close to HCS, the HCSplay the role of a Sun$-$Earth magnetic connection. SEPs drift around HCSpaths, and SEPs are also drift in a wide range of longitudes by the HCSs. Insome cases, and especially when Earth crosses the HCS sector, a fraction ofthese particles can reach Earth with a harder energetic particle flux,triggering a ground-level enhancement (GLE). The blast on 2017 September 10,which triggered the GLE \#72, was the second in the current solar cycle. Weshow that the two GLEs, including all sub-GLEs observed in the current solarcycle, comes from solar explosions that happened within an HCS structure; thisbehavior is also observed in the GLEs of the previous solar cycle. In general,solar explosions from active regions poorly connected with Earth can triggerGLEs, through the mechanism described above. In all cases, the SEPs driftprocesses by HCS structures provides an efficient particle transport, allowingthe observation of these solar transient events.

Relativistic proton levels from region AR 12673 (GLE \#72) and the heliospheric current sheet as a Sun$-$Earth magnetic connection