Atmospheric corrections of the cosmic ray fluxes detected by the Solar Neutron Telescope at the Summit of the Sierra Negra Volcano in Mexico

Barrantes, Marco; Valdés-Galicia, J. F.; Musalém, O.; Hurtado, A.; Anzorena, M.; Garcı́a, Rocı́o; Taylor, R.; Muraki, Y.; Matsubara, Y.; Sako, T.; Sasai, Yoshinori; Hinaro, N.; Tateiwa, N.; Tsujihara, H.; González, L. X.; Ortiz, E.; Shibata, S.; Watanabe, Kyoko; Sakai, Takehiro

doi:10.22201/igeof.00167169p.2018.57.4.2105

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…However, there are several other factors, other than rigidity or real effects from FDs that could influence the variations in the count rate of NM stations. Atmospheric depth, pressure, temperature, relative humidity, local wind speed, the rotation of the Earth concerning the acceptance cone of the detectors, latitudinal effects, instrumental variations, a station's sensitivity to CR modulation, equatorial anisotropy, North-South anisotropy, geomagnetic variations, snow, limited cone of acceptance, spurious modulation, magnetospheric effects or imperfections in the present results are some of the agents that might be responsible for the larger FD magnitudes measured at stations of low cutoff rigidity (see Barrantes et al 2018;Belov et al 2018, for example).…”

Section: Figsmentioning

confidence: 65%

Investigating The Dependence Of Forbush Decrease On Geomagnetic Cutoff Rigidity

C Nwuzor,

Okike,

E Umahi

et al. 2024

Glo Jnl Pure Appl Sci

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The dependence of Forbush decreases on geomagnetic cutoff rigidity has been studied. The study aimed to investigate the implications of geomagnetic cutoff rigidity on forbush decrease. To achieve this aim, the data of cosmic ray daily count from six neutron stations of Tibet, Esoi, Tsumeb, Oulu, Apatity, and Magadan were used. These data covered a period of six (6) years from the year 2010 to 2015. An advanced manual method developed by Okike and Umahi (2019b) was used to select the FDs through R. statistical software. A sharp depression in the intensity of cosmic ray variation known as Forbush decrease (FD) was detected. A large number of FDs were recorded. The results of our analysis was grouped into stations of high, low and middle rigidity. The stations of low rigidity recorded the highest number of FDs followed by stations of middle rigidity while the stations of high rigidity recorded the least number of FDs. The magnitude of these FDs was determined. It was observed that FD magnitudes vary inversely with the station's rigidity. A correlation between the FD magnitudes of the cosmic ray (CR) stations was also tested. It was observed that stations of low rigidity indicated the best correlation followed by the stations of middle rigidity, while the stations of high rigidity indicated the least correlation. A regression was further tested between the FD magnitudes of the different stations. The result of the regression between FDs of different stations was 99.8% , 98% and 97.5% significant for stations low, high and middle rigidity stations respectively. In summary, this study used a large number of events to test the rigidity dependence of FDs, and it was observed that FDs are inversely related to the cutoff rigidity. Thus, FDs measured at the CR stations can be used to examine the effects of rigidity between the stations.

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Section: Figsmentioning

confidence: 65%

Investigating The Dependence Of Forbush Decrease On Geomagnetic Cutoff Rigidity

C Nwuzor,

Okike,

E Umahi

et al. 2024

Glo Jnl Pure Appl Sci

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“…We analyzed the data registered by the SNT's N2-N4 and C2-C4 channels. The data were pressure corrected using the pressure correction coefficients calculated in [1]. Subsequently, the data were normalized to the average counting rate of four days prior to each GS.…”

Section: Methodsmentioning

confidence: 99%

Geomagnetic Storm Effects on the Solar Neutron Telescope at Sierra Negra, Mexico

Newton-Bosch,

González,

Valdés-Galicia

et al. 2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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The effects of Space Weather events on cosmic rays detected by the Solar Neutron Telescope (SNT) at Sierra Negra, Mexico, were studied. The SNT is part of the Sierra Negra Cosmic Ray Observatory (SN-CRO), located at 4580 m a.s.l. We analyzed the data recorded by six SNT channels (C2, C3, C4, N2, N3, and N4) during geomagnetic storms from December 2015 to December 2022. Using the Dst and Kp indices, 30 moderate (Dst < -50 nT, Kp ≥ 5) and intense (Dst < -100 nT, Kp ≥ 7) geomagnetic storms were selected. The C2, C3, C4, N2, N3 and N4 channels detect charged and neutral particles, respectively, with energy deposition thresholds of E > 60, 90 and 120 MeV. The counting rates of these channels present diurnal variation, which was removed with the seasonal trend decomposition using Loess method. After data treatment, either significant decreases or enhancements were observed in the trend of at least one SNT channel for 21 of the analyzed events. Two confirmed Forbush decreases were also identified.

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