Coronal holes in the long-term cosmic rays modulation

Белов, А. В.

doi:10.22323/1.236.0201

Cited by 2 publications

(2 citation statements)

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“…Its aim is to validate the model predictions studying the radio emission produced by an electron beam which collides in an high density polyethylene target placed in a variable magnetic field. The results have been presented in [91,92,93]. Notable is also the re-analysis of the LOPES data based on a new calibration of the antennas [89], showing good agreement between the amplitude of the radio signal recorded in coincidence with the air showers detected by the KASCADE-Grande array and its theoretical prediction made with the CoREAS simulation code [89,94].…”

Section: The Radio Detection Techniquementioning

confidence: 98%

Cosmic rays: air showers from low to high energies

Verzi¹

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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Section: The Radio Detection Techniquementioning

confidence: 98%

Cosmic rays: air showers from low to high energies

Verzi¹

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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“…Neutron monitors (NMs) have been used to collect neutron data for more than seven decades. The meteorological effects on neutron flux due to pressure, temperature, humidity, wind, snow, atmospheric electric field have been studied extensively [1][2][3][4][5][6][7]. The most prominent effect is due to the atmospheric pressure, which has been reported since the 1920s [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Barometric pressure correction to gamma-ray observations and its energy dependence

Datar

Vichare

Selvaraj³

2021

J. Cosmol. Astropart. Phys.

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Cosmic rays (CRs) have been studied extensively in the last century to understand the processes in the universe as well as in the solar system. In today's satellite era, although many observations are made from space, CR observations from the ground are still viewed as a significant tool. These observations, however, mainly detect the secondary cosmic rays (SCRs) produced via nuclear spallation processes during the interactions of the primary CR with the atmospheric nuclei. Neutron, muon, and gamma are the major components of SCRs detected on the ground. It is well known that atmospheric pressure plays a vital role in the SCR flux observed on the ground. Barometric pressure correction is standard practice for neutron monitor (NM) data. For gamma-rays, however, being massless, their pressure dependence is not intuitive. Nevertheless, the pressure affects the particles such as e±, μ±, which produce gamma rays in the cascade. Subsequently, the indirect pressure dependence of the gamma-ray flux can be anticipated. We examine this aspect in detail by studying the gamma-ray counts detected by the NaI (Tl) detector. The present study confirms that there is no correlation between the atmospheric pressure and the total counts covering the entire energy range (150 keV–10 MeV) recorded by the NaI detector. However, the scenario differs when the fluxes of different energies are investigated separately. The gamma rays of energy below ∼3 MeV are primarily due to the radioactivity originating from the ground, whereas gamma rays above 3 MeV are mainly produced in the CR cascade. It is observed that the counts of energy above 3 MeV are well anti-correlated with the atmospheric pressure. The barometric coefficient obtained here matches well with that reported by the previous studies which used anti-coincidence methods. This may indicate that the role of directly detected muons and electrons by the NaI (Tl) in the observed pressure dependence is non-significant. It is demonstrated that applying the barometric correction formula to NaI (Tl) data successfully removes the pressure dependence in the flux above 3 MeV. Therefore, we suggest that the particle flux data above 3 MeV measured by NaI (Tl) detector needs to be corrected for the local atmospheric pressure variations.

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Coronal holes in the long-term cosmic rays modulation

Cited by 2 publications

References 0 publications

Cosmic rays: air showers from low to high energies

Cosmic rays: air showers from low to high energies

Barometric pressure correction to gamma-ray observations and its energy dependence

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