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On Oct. 29th, 2015, the Earth crossed through a fold in the heliosphericcurrent sheet. This is called a "solar sector boundary crossing". Under thiscircumstances, a large coronal mass ejection (CME) occurred at 2:24 UT, behindthe west limb on the sun. Therefore, the boundary crossing occurred when in theblast's nearby environment was filled with energetic particles accelerated bythe CME shock waves, spacecraft measurements (ACE and GOES) have shown that insuch a case, protons with energies at least up to 30 MeV were stored within therange of the sector boundary. Thus, a fraction of the solar energetic particles(SEP) from CME, reached Earth around 03:00 UT in the aftermath of the solarblast, reaching the condition of an S1 (minor) radiation storm level. Theeffect at ground level was a small increase in the counting rate in some groundbased detectors, such as the South Pole Neutron Monitor (NM) and a sharp peakobserved in the counting rate in the New-Tupi detector in Rio de Janeiro,Brazil and Thule NM. The event is being classified as a new GLE (Ground LevelEnhancement) in the current solar cycle, as the GLE 73. However, in all cases,the counting rate increase is smaller or near than 2\%. The Earth crossedthrough a fold in the heliospheric current sheet also caused a geomagneticdisturbance, below the minor geomagnetic storm threshold, observed in the ACEspacecraft and a small decrease in the counting rates of some ground leveldetectors, such as the New-Tupi detector and Thuly NM. Details of theseobservations are reported.

Ground level observations of relativistic solar particles on Oct 29th, 2015: Is it a new GLE on the current solar cycle?