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@ARTICLE{Chilingarian:619101,
      author       = {Chilingarian, A. and Karapetyan, T. and Sargsyan, B. and
                      Zazyan, M. and Knapp, Johannes and Walter, M. and Rehm, T.},
      title        = {{I}ncrease in the count rates of ground-based cosmic-ray
                      detectors caused by the heliomagnetic disturbance on 5
                      {N}ovember 2023},
      journal      = {epl},
      volume       = {146},
      number       = {2},
      issn         = {0295-5075},
      address      = {Les Ulis},
      publisher    = {EDP Sciences},
      reportid     = {PUBDB-2024-07388},
      pages        = {24001},
      year         = {2024},
      note         = {Waiting for fulltext},
      abstract     = {This letter presents a rare physical phenomenon associated
                      with solar activity, manifesting in anomalies within
                      neutron, electron, and gamma-ray fluxes in the atmosphere.
                      Conventionally, the Earth’s magnetic-field disturbances
                      reduce cosmic-ray intensity reaching the surface.However, a
                      temporary surge in cosmic-ray flux occurs intermittently
                      known as the magnetosphericeffect (ME). Our observations
                      reveal that this effect predominantly induces a count rate
                      increasein particle detectors positioned at middle latitudes
                      on mountaintops. On November 5, 2023, $a2–3\%$ increase in
                      neutron monitors at mountain altitudes and up to $5\%$
                      increase in thin plasticscintillators registering electrons
                      and gamma rays was observed. This flux escalation
                      coincidedwith a southward orientation of the interplanetary
                      magnetic field. Importantly, we present, forthe first time,
                      the energy spectrum of the Magnetospheric Effect observed at
                      two mountaintops:Aragats and Zugspitze. Simulations of
                      low-energy proton interactions in the terrestrial atmosphere
                      affirm the augmentation of low-energy cosmic rays. Protons,
                      typically restricted by thegeomagnetic cutoff, reached the
                      Earth’s atmosphere, generating detectable particle showers
                      onthe Earth’s surface. To sum up, 1) we measure an
                      increase in the count rate of magnetosphericorigin using
                      particle detectors located at mountain altitudes and middle
                      latitudes; 2) for the firsttime, we measured the energy
                      spectra of the particle fluxes during the magnetospheric
                      effect withspectrometers located on Mount Aragats and
                      Zugspitze; 3) particle flux enhancement coincideswith the
                      depletion of the horizontal component of the geomagnetic
                      field; 4) we explain why themagnetospheric effect was
                      observed at mountain altitudes and not at sea level.},
      cin          = {$Z_GA$},
      ddc          = {530},
      cid          = {$I:(DE-H253)Z_GA-20210408$},
      pnm          = {613 - Matter and Radiation from the Universe (POF4-613)},
      pid          = {G:(DE-HGF)POF4-613},
      experiment   = {EXP:(DE-H253)CTA-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001267534800001},
      doi          = {10.1209/0295-5075/ad329c},
      url          = {https://bib-pubdb1.desy.de/record/619101},
}