Solar Neutron Decay Protons Observed in November 7, 2004

Muraki, Y.; Valde-Galicia, Jose F.; Ortiz, E.; Matsubara, Y.; Shibata, S.; Sako, T.; Masuda, S.; Tokumaru, M.; Koi, T.; Ooshima, Akitoshi; Sakai, Takehiro; Naito, T.; Miranda, P.

doi:10.22323/1.395.1264

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…Measurements performed during intense and moderate geomagnetic storms in the period of 12.2015-12.2022 allowed to report that noticeable decreases in the counting rate of at least one Solar Neutron Telescope channel were visible [32]. Moreover, properties of solar neutron decay protons, being infrequent events, were discussed [33] Since the end of 2022 in the Cosmic ray Laboratory at Chacaltaya in Bolivia, at altitude of 5240 m, a bonner sphere neutron spectrometer and dosimetric instruments operate in the frame of South Atlantic Magnetic Anomaly Dosimetry at High Altitude (SAMADHA) project. In the South Atlantic Anomaly region the secondary cosmic ray neutrons spectrum as well as an environmental dose owing to GCRs at very high elevation are monitored [34].…”

Section: Pos(icrc2023)034mentioning

confidence: 99%

Rapporteur Talk: Solar and Heliospheric

Gil

2023

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

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This rapporteur paper summarizes the 127 contributions on solar and heliospheric physics (i.e. the SH sessions) presented during the 38th International Cosmic Ray Conference in Nagoya. Presented works covered a range of topics concerning updates on methods and instruments allowing cosmic rays measurements. Progress done in the modeling of modulation, acceleration and propagation of cosmic rays within the heliosphere was discussed. During the oral presentations and posters variety of topics were discussed. Among them there were deliberated such topics as changeability observed in the galactic cosmic rays (GCR) flux on the ground, i.e. GCR diurnal anisotropy, Forbush decreases, mid-and long-term GCR periodicities. Solar energetic particles (SEP) and ground level enhancements (GLEs) observational and modeling results were presented. Calculation of radiation dose for airplane passengers and crew, as well as astronaut, were reported. Moreover, historical reconstructions were discussed.

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Section: Pos(icrc2023)034mentioning

confidence: 99%

Rapporteur Talk: Solar and Heliospheric

Gil

2023

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

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“…Chacaltaya in Bolivia and Mt. Sierra Negra in Mexico [1]. The data are shown in Figure 1 and 2, respectively.…”

Section: Introductionmentioning

confidence: 97%

“…An interesting event was registered in association with the large solar flare on November 7, 2004 by the high-altitude solar neutron detectors located at Mt. Chacaltaya in Bolivia and Mt.…”

Section: Introductionmentioning

confidence: 99%

Proton penetration efficiency over a high altitude observatory in Mexico

Miyake,

Koi,

Muraki

et al. 2023

SciPost Phys. Proc.

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In association with a large solar flare on November 7, 2004, the solar neutron detectors located at Mt. Chacaltaya (5,250 m) in Bolivia and Mt. Sierra Negra (4,600 m) in Mexico recorded very interesting events. In order to explain these events, we have performed a calculation solving the equation of motion of anti-protons inside the magnetosphere. Based on these results, the Mt. Chacaltaya event may be explained by the detection of solar neutrons, while the Mt. Sierra Negra event may be explained by the first detection of very high energy solar neutron decay protons (SNDPs) around 6 GeV.

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“…Sierra Negra may be due to high-energy solar neutron decay protons. The proton acceleration beyond 10 GeV within one minute in the impulsive solar flare has been reported in the previous conference proceedings of ICRC2021 [1] and ISVHECRI2022 [2].…”

Section: Introductionmentioning

confidence: 98%

Proton Penetration Efficiency over Sierra Negra (Mexico) and Oulu (Finland)

Muraki¹

2023

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

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a large solar flare was observed, which had a notable impact on the solar neutron detectors located at Mt. Chacaltaya (5,250 m) in Bolivia and Mt. Sierra Negra (4,600 m) in Mexico. In addition, the neutron monitor at Oulu, Finland, recorded a 5-sigma enhancement. In order to determine the causes of these enhancements, we performed trajectory simulations ejecting anti-protons from 20 km above each location, and checked whether or not these anti-protons could reach the magnetopause (∼8𝑅 E ). Then, we understand that the Chacaltaya enhancement was caused by solar neutrons themselves, while the Mt. Sierra Negra event may have been produced by high-energy solar neutron decay protons (SNDPs) with energies ≥ 6 GeV. Based on our antiproton trajectory analysis, we suggest that the enhancement at Oulu may also have been produced by solar neutron decay protons with energies around ≥ 200 MeV. During this flare, protons were accelerated up to 10 GeV within one minute, leading to the production of SNDPs.

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Solar Neutron Decay Protons Observed in November 7, 2004

Cited by 3 publications

References 18 publications

Rapporteur Talk: Solar and Heliospheric

Rapporteur Talk: Solar and Heliospheric

Proton penetration efficiency over a high altitude observatory in Mexico

Proton Penetration Efficiency over Sierra Negra (Mexico) and Oulu (Finland)

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