On-orbit calibration of geostationary electron and proton flux observations for augmentation of an existing empirical radiation model

Rodriguez, J. V.; Denton, M. H.; Henderson, M. G.

doi:10.1051/swsc/2020031

Cited by 7 publications

(5 citation statements)

References 33 publications

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“…The calibration method is the same as that of similar particle detectors [18][19][20][21][22]. The calibration items include the energy spectral range, energy linearity, energy resolution, particle flux accuracy and a test of sensor thickness, size, field of view and particle identification capability.…”

Section: Ground Calibration 41 Calibration Methodsmentioning

confidence: 99%

Medium-Energy Proton Detector Onboard the FY-4B Satellite

Zhang,

Shen

et al. 2023

Aerospace

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This work introduces the instrument design of the medium-energy proton detector (MEPD, detection range: 30 keV–5 MeV) mounted on the Chinese Fengyun-4B (FY-4B) satellite. Compared to a similar detector on the Fengyun-3E (FY-3E) satellite, this instrument has undergone significant changes due to the different orbital radiation environment and solar lighting conditions. Based on the calculation of the radiation model AP8, the geometrical factor is reduced to 0.002 cm2sr, while that of the MEPD on the FY-3E satellite is 0.005 cm2sr. Another difference is that the sensors in some directions are exposed to direct sunlight for 80 min every day on this orbit, depending on the attitude angle of the satellite, which is much worse than that on the FY-3E satellite. According to the calculation results of transmittance of photons through different materials, a 100 nm thickness nickel film is added in front of the sensors to eliminate light pollution completely. The test using a solar simulator shows that the measure is effective and the detector has no error count when the solar irradiance coefficient is 1.0. In addition, the Geant4 software is applied to simulate the particle transportation process under complete machine condition to check the contamination of electrons in the sensors in all directions after magnetic deflection. The data obtained in orbit show that the instrument works properly, and the data are in good agreement with the AP8 model. The observations of the MEPD on board the FY-4B satellite can provide important support for the safety of spacecraft and theoretical research related to space weather.

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Section: Ground Calibration 41 Calibration Methodsmentioning

confidence: 99%

Medium-Energy Proton Detector Onboard the FY-4B Satellite

Zhang,

Shen

et al. 2023

Aerospace

View full text Add to dashboard Cite

show abstract

“…The calibration method is the same as that of similar particle detectors [11][12][13][14][15]. The calibration items include the energy spectra range, energy linearity, energy resolution, particle flux accuracy and the test of the sensor thickness, size, field of view, and the particle identification capability etc.al.…”

Section: Calibration Methodsmentioning

confidence: 99%

Medium Energy Proton Detector Onboard FY-4B Satellite

Zhang,

Shen,

Zhang

et al. 2023

Preprint

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: This work introduces the instrument design of the medium energy proton detector (MEPD, detection range: 30keV-5MeV) mounted on the Chinese Fengyun-4B (FY-4B) satellite. Compared with the similar detector on the Fengyun-3E (FY-3E) satellite, the instrument has undergone significant changes due to the different orbital radiation environment and solar lighting conditions. Based on the calculation of radiation model AP8, the geometry factor is reduced to 0.002 cm2sr, while the MEPD on FY-3E satellite is 0.005 cm2sr. Another difference is that sensors in some directions is exposed to direct sunlight for 80 minutes every day on this orbit, depending on the attitude angle of the satellite, which is much worse than that on FY-3E satellite. According to the calculation results of permeability of photons through different materials, a 100 nm thickness nickel film is added in front of sensors in order to eliminate light pollution completely. The experiment on the solar simulator shows that the measure is effective and the detector has no error counts when the solar irradiance coefficient is 1.0. In addition, Geant4 software is applied to simulate particle transportation process under complete machine condition so that to check the contamination of electrons on sensors among all directions after magnetic deflection. Data obtained in orbit shows that the instrument works properly, and the data is in good agreement with the AP8 model. The observations of the MEPD on board the FY-4B satellite can provide important support for the safety of the spacecraft and the theoretical research related to space weather.

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“…Note that west is lower than east-facing detector flux due to the finite proton gyroradius at these energies, so lower energy protons gyrate from higher L and higher from lower L into west and east facing detectors respectively, with flux higher at lower energies. condition for the subsequent radial diffusion calculation, the GOES EPS measurements were augmented with 80-800 keV measurements from the GOES Magnetospheric Proton Detector (Rodriguez et al, 2020). Assuming zero proton flux above the P1 channel midpoint energy (∼2.5 MeV), we find that the P1 effective energy is approximately 1 MeV during quiet solar periods.…”

Section: Appendix Amentioning

confidence: 99%

Simulated Trapping of Solar Energetic Protons for the 8–10 March 2012 Geomagnetic Storm: Impact on Inner Zone Protons as Measured by Van Allen Probes

et al. 2023

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Solar energetic protons (SEPs) have been shown to contribute significantly to the inner zone trapped proton population for energies <100 MeV and L > 1.3 (Selesnick et al., 2007, https://doi.org/10.1029/2006sw000275). The Relativistic Electron Proton Telescope (REPT) on the Van Allen Probes launched 30 August 2012 observed a double‐peaked (in L) inner zone population throughout the 7‐year lifetime of the mission. It has been proposed that a strong SEP event accompanied by a CME‐shock in early March 2012 provided the SEP source for the higher L trapped proton population, which then diffused radially inward to be observed by REPT at L ∼ 2. Here, we follow trajectories of SEP protons launched isotropically from a sphere at 7 Re in 15 s cadence fields from an Lyon‐Fedder‐Mobarry coupled to Rice Convection Model global magnetohydrodynamic (MHD) simulation driven by measured upstream solar wind parameters. The timescale of the interplanetary shock arrival is captured, launching a magnetosonic impulse propagating azimuthally along the dawn and dusk flanks inside the magnetosphere, shown previously to produce SEP trapping. The MHD‐test particle simulation uses Geostationary Operational Environmental Satellite (GOES) proton energy spectra to weight the initial radial profile required for the radial diffusion calculation over the following 2 years. GOES proton measurements also provide a dynamic outer boundary condition for radial diffusion. A direct comparison with REPT measurements 20 months following the trapping event in March 2012 supports this novel combination of short‐term and long‐term evolution of the newly trapped protons.

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On-orbit calibration of geostationary electron and proton flux observations for augmentation of an existing empirical radiation model

Cited by 7 publications

References 33 publications

Medium-Energy Proton Detector Onboard the FY-4B Satellite

Medium-Energy Proton Detector Onboard the FY-4B Satellite

Medium Energy Proton Detector Onboard FY-4B Satellite

Simulated Trapping of Solar Energetic Protons for the 8–10 March 2012 Geomagnetic Storm: Impact on Inner Zone Protons as Measured by Van Allen Probes

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