TY - JOUR
T1 - Measurement of the neutron spectrum and dose in the SAA region during strong solar activity episodes by the SAMADHA experiment
AU - SAMADHA collaboration
AU - Vigorito, C. F.
AU - Vernetto, S.
AU - Bedogni, R.
AU - Savietto, D.
AU - Russo, L.
AU - Campoy, A. I.Castro
AU - Loza, P. P.Miranda
AU - Vasquez, M. A.Subieta
AU - Ambrosino, F.
AU - Bedogni, R.
AU - Pacheco, M. A.Caballero
AU - Calamida, A.
AU - Cantone, C.
AU - Cassardo, C.
AU - Campoy, A. I.Castro
AU - Cesarini, A.
AU - Cirilli, S.
AU - D’Avino, V.
AU - Miralles, C. Domingo
AU - Fabi, M.
AU - Ferrarese, S.
AU - Fontanilla, A.
AU - Giannini, G.
AU - Ros, J. M.Gomes
AU - Gorgi, A.
AU - Grimani, C.
AU - Jerse, G.
AU - La Verde, G.
AU - Miranda, P.
AU - Messerotti, M.
AU - Monti, V.
AU - Pietropaolo, A.
AU - Pugliese, M.
AU - Richetti, A.
AU - Zanini, A.
AU - Vasquez, M. A.Subieta
AU - Terrazas, J. C.
AU - Ticona, R.
AU - Tonelli, D.
AU - Vigorito, C. F.
AU - Villani, M.
AU - Vernetto, S.
N1 - Publisher Copyright:
© Copyright owned by the author(s)
PY - 2025/12/30
Y1 - 2025/12/30
N2 - The main aim of the SAMADHA (South Atlantic Magnetic Anomaly Dostimetry at High Altitude) project is to monitor the cosmic ray neutron spectrum and dose at very high altitudes in the South Atlantic Anomaly region during the maximum activity of the 25tℎ solar cycle. The experimental setup for this measurement consists of an Extended Bonner Sphere System and a commercial Rem counter. A linear energy transfer spectrometer to measure the electromagnetic part of the extensive air showers, and a high-precision barometer to correct the effect of the atmospheric pressure variations, complete the system. The experiment is operated at the Chacaltaya Cosmic Ray Laboratory in Bolivia, 5270 m above sea level, and can be remotely controlled via an Internet connection. The instruments have been collecting data almost continuously since March 2023, together with a 12NM-64 neutron monitor managed by the local research group. This high energy neutron detector monitors the variations in the flux of cosmic rays which can be used to identify the periods of most intense solar activity. We looked at some important Forbush Decreases that occurred in 2024 and 2025 after strong CMEs from the Sun searching for cross correlations in our data. In this paper, we report on the preliminary comparison between the neutron spectrum and dose measured during two of these episodes with the spectrum and dose measured during the corresponding "quiet sun" periods.
AB - The main aim of the SAMADHA (South Atlantic Magnetic Anomaly Dostimetry at High Altitude) project is to monitor the cosmic ray neutron spectrum and dose at very high altitudes in the South Atlantic Anomaly region during the maximum activity of the 25tℎ solar cycle. The experimental setup for this measurement consists of an Extended Bonner Sphere System and a commercial Rem counter. A linear energy transfer spectrometer to measure the electromagnetic part of the extensive air showers, and a high-precision barometer to correct the effect of the atmospheric pressure variations, complete the system. The experiment is operated at the Chacaltaya Cosmic Ray Laboratory in Bolivia, 5270 m above sea level, and can be remotely controlled via an Internet connection. The instruments have been collecting data almost continuously since March 2023, together with a 12NM-64 neutron monitor managed by the local research group. This high energy neutron detector monitors the variations in the flux of cosmic rays which can be used to identify the periods of most intense solar activity. We looked at some important Forbush Decreases that occurred in 2024 and 2025 after strong CMEs from the Sun searching for cross correlations in our data. In this paper, we report on the preliminary comparison between the neutron spectrum and dose measured during two of these episodes with the spectrum and dose measured during the corresponding "quiet sun" periods.
UR - https://www.scopus.com/pages/publications/105029043598
U2 - 10.22323/1.501.1376
DO - 10.22323/1.501.1376
M3 - Conference article
AN - SCOPUS:105029043598
SN - 1824-8039
VL - 501
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 1376
T2 - 39th International Cosmic Ray Conference, ICRC 2025
Y2 - 15 July 2025 through 24 July 2025
ER -