Volume 39 Issue 3
May  2019
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CHEN Shanqiang, LIU Siqing, CHEN Dong, LIN Ruilin, SHI Liqin, CAO Yong. A Model for Real-time Calculation of the Atmospheric Neutronormalsize[J]. Journal of Space Science, 2019, 39(3): 342-348. doi: 10.11728/cjss2019.03.342
Citation: CHEN Shanqiang, LIU Siqing, CHEN Dong, LIN Ruilin, SHI Liqin, CAO Yong. A Model for Real-time Calculation of the Atmospheric Neutronormalsize[J]. Journal of Space Science, 2019, 39(3): 342-348. doi: 10.11728/cjss2019.03.342

A Model for Real-time Calculation of the Atmospheric Neutronormalsize

doi: 10.11728/cjss2019.03.342
  • Received Date: 2018-06-12
  • Rev Recd Date: 2019-01-07
  • Publish Date: 2019-05-15
  • In order to evaluate the global distribution of atmospheric neutron at 0~100km altitude for real time, the propagation of cosmic rays in the geomagnetic field and the atmosphere is analyzed. By using the TSY05 and MAGNETOCOSMICS model, the real-time calculation of global geomagnetic cut-off rigidities with 1h resolution is realized. The spherical shell geometry model is established at intervals of 1km using NLRMSISE-00 model, and the spectrum distribution of secondary particles generated by different particles is calculated by the Monte Carlo simulation techniques, namely, the Geant4 toolkit, then an atmospheric neutron database is created. Compared with EXPACS model, the validity and reliability of the database are verified. Based on the observed or predicted space environment parameters, the energy spectra of the cosmic ray and the solar proton event in the synchronous orbit are calculated, and the effective vertical cut-off rigidities in function of latitude and longitude at the altitude of 100km. The atmospheric neutron and effective dose are calculated by using linear interpolation per hour.

     

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