Simultaneous observation at sea level and at 5200 m.a.s.l. of high energy particles in the South Atlantic Anomaly

Augusto, C. R. A.; Navia, C. E.; Tsui, K. H.; Miranda, P.; Ticona, R.; Velarde, A.; Saavedra, O.

doi:10.1016/j.astropartphys.2010.04.005

Cited by 11 publications

(11 citation statements)

References 10 publications

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“…4). The Tupi signal significance was calculated according to the bin selection criteria (BSC) algorithm [25,26]. According to this algorithm, the signal statistical significance S in the ith bin is defined as…”

Section: Observationsmentioning

confidence: 99%

Observation of a muon excess following a gamma-ray burst event detected at the International Space Station

et al. 2013

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On April 24, 2012, at 16:47:14 UT, the Gas Slit Camera (GSC) of the Japanese Monitor of All-sky X-ray Image (MAXI) instrument on the International Space Station detected a short x-ray transient lasting about 34 seconds. The MAXI/GSC transient was most likely a gamma-ray burst (GRB), because of the high Galactic latitude, spectral hardness ratio, and the absence of known bright x-ray sources at the detected position. In addition, the MAXI/GSC transient GRB 120424A coordinates were in the field of view of the inclined Tupi muon telescope located at ground level (3 m above sea level) at (22:9 W, 43:2 S) in the South Atlantic Anomaly region. We report here that the Tupi telescope registered a muon excess with a signal significance 6:2 within the MAXI/GSC transient time period. Assuming a power law function with a spectral index of ¼ À1:54 in the tail of the primary gamma-ray energy spectrum, we can conclude that the fluence obtained from the muon excess detected by the Tupi telescope is consistent with the preliminary value obtained by the MAXI team. This result agrees with an assumption that the muons were produced in photonuclear reactions in the Earth's atmosphere. In addition, we show also that the South Atlantic Anomaly region can be a favorable place at ground for the detection of the tail of the energy spectrum (the GeV counterpart) of some GRBs.

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Section: Observationsmentioning

confidence: 99%

Observation of a muon excess following a gamma-ray burst event detected at the International Space Station

et al. 2013

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“…The minimum value happens at zenith and azimuth angles of ∼ 60 0 and 0 0 respectively. Some effects of the SAA in the cosmic ray observed at ground was shown in [3]. For instance in the Earth's upper atmosphere, there is the ionosphere (100 km above sea level) which is characterized by a larger ion concentration [4].…”

Section: Sensitivity Of the Telescopesmentioning

confidence: 99%

CRs Observation at TUPI

Navia¹

2011

Proceedings of 4th School on Cosmic Rays and Astrophysics — PoS(CRA School)

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“…It has been shown that the SAA region [8] also favours the precipitation of high energy particles (Van Allen background), with energies above the pion production threshold, because they produce air showers in the Earth's atmosphere and the hard component (muons) is able to reach sea level [8]. Even so, the Van Allen background has an enhancement only at daytime, beginning three hours after sunrise until around one hour after sunset.…”

Section: Location Of the Tupi Telescopesmentioning

confidence: 99%

Muon excess at sea level from solar flares in association with the Fermi GBM spacecraft detector

et al. 2011

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This paper presents results of an ongoing survey on the associations between muon excesses at ground level registered by the Tupi telescopes and transient solar events, two solar flares whose gamma-ray and X-ray emissions were reported by, respectively, the Fermi GBM and the GOES 14. We show that solar flares of small scale, those with prompt X-ray emission classified by GOES as C-Class (power 10 −6 to 10 −5 W m 2 at 1 AU) may give rise to muon excess probably associated with solar protons and ions emitted by the flare and arriving at the Earth as a coherent particle pulse. The Tupi telescopes are within the central region of the South Atlantic Anomaly (SAA), which allows particle detectors to achieve a low rigidity of response to primary and secondary charged particles (≥ 0.1 GV). Here we argue for the possibility of a "scale-free" energy distribution of particles accelerated by solar flares. Large and small scale flares have the same energy spectrum up to energies exceeding the pion production, the difference between them is only the intensity. If this hypothesis is correct, the Tupi telescope is registering muons produced by protons (ions)

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Simultaneous observation at sea level and at 5200 m.a.s.l. of high energy particles in the South Atlantic Anomaly

Cited by 11 publications

References 10 publications

Observation of a muon excess following a gamma-ray burst event detected at the International Space Station

Observation of a muon excess following a gamma-ray burst event detected at the International Space Station

CRs Observation at TUPI

Muon excess at sea level from solar flares in association with the Fermi GBM spacecraft detector

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