Application of the Verified Neutron Monitor Yield Function for an Extended Analysis of the GLE # 71 on 17 May 2012
Abstract Intense solar activity was observed in May 2012. A notable ground level enhancement (GLE) was registered on 17 May 2012 by several space‐borne instruments as well as on ground by neutron monitors (NMs). This event is known as GLE # 71. Here, we derived the spectral and angular characteristi...
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| Format: | Article |
| Language: | English |
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Wiley
2021-02-01
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| Series: | Space Weather |
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| Online Access: | https://doi.org/10.1029/2020SW002626 |
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| author | A. L. Mishev S. A. Koldobskiy I. G. Usoskin L. G. Kocharov G. A. Kovaltsov |
| author_facet | A. L. Mishev S. A. Koldobskiy I. G. Usoskin L. G. Kocharov G. A. Kovaltsov |
| author_sort | A. L. Mishev |
| collection | DOAJ |
| description | Abstract Intense solar activity was observed in May 2012. A notable ground level enhancement (GLE) was registered on 17 May 2012 by several space‐borne instruments as well as on ground by neutron monitors (NMs). This event is known as GLE # 71. Here, we derived the spectral and angular characteristics, and apparent source position of the solar protons during the GLE # 71, employing verified newly computed NM yield function and sophisticated unfolding procedure. We considerably improved the previously derived information about the spectra and angular distribution, namely, the precision, time span, and time resolution of the derived characteristics, specifically during the event onset and late phase. A comparison with direct measurements, with the Payload for Antimatter Matter Exploration and Light‐nuclei Astrophysics (PAMELA) experiment, of the particle fluence was performed, and good agreement between NM and direct space‐borne data analysis was achieved. Subsequently, we computed the effective dose rates in the polar region at several altitudes during the event using the derived rigidity spectra of the solar protons as a reliable input for the corresponding radiation model. The contribution of the galactic cosmic rays and solar protons to the exposure is explicitly considered. We computed the integrated exposure during the event and discussed the exposure of crew members/passengers to radiation at several altitudes. |
| format | Article |
| id | doaj-art-b790e92419d647a5ba95a2d7befb65e0 |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2021-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-b790e92419d647a5ba95a2d7befb65e02025-01-14T16:30:32ZengWileySpace Weather1542-73902021-02-01192n/an/a10.1029/2020SW002626Application of the Verified Neutron Monitor Yield Function for an Extended Analysis of the GLE # 71 on 17 May 2012A. L. Mishev0S. A. Koldobskiy1I. G. Usoskin2L. G. Kocharov3G. A. Kovaltsov4Space Physics and Astronomy Research Unit University of Oulu Oulu FinlandNational Research Nuclear University MEPhI Moscow RussiaSpace Physics and Astronomy Research Unit University of Oulu Oulu FinlandSodankylä Geophysical Observatory University of Oulu Oulu FinlandIoffe Physical‐Technical Institute St. Petersburg RussiaAbstract Intense solar activity was observed in May 2012. A notable ground level enhancement (GLE) was registered on 17 May 2012 by several space‐borne instruments as well as on ground by neutron monitors (NMs). This event is known as GLE # 71. Here, we derived the spectral and angular characteristics, and apparent source position of the solar protons during the GLE # 71, employing verified newly computed NM yield function and sophisticated unfolding procedure. We considerably improved the previously derived information about the spectra and angular distribution, namely, the precision, time span, and time resolution of the derived characteristics, specifically during the event onset and late phase. A comparison with direct measurements, with the Payload for Antimatter Matter Exploration and Light‐nuclei Astrophysics (PAMELA) experiment, of the particle fluence was performed, and good agreement between NM and direct space‐borne data analysis was achieved. Subsequently, we computed the effective dose rates in the polar region at several altitudes during the event using the derived rigidity spectra of the solar protons as a reliable input for the corresponding radiation model. The contribution of the galactic cosmic rays and solar protons to the exposure is explicitly considered. We computed the integrated exposure during the event and discussed the exposure of crew members/passengers to radiation at several altitudes.https://doi.org/10.1029/2020SW002626cosmic rayssolar energetic particlesdata analysisexposure to radiationaviation dosimetry |
| spellingShingle | A. L. Mishev S. A. Koldobskiy I. G. Usoskin L. G. Kocharov G. A. Kovaltsov Application of the Verified Neutron Monitor Yield Function for an Extended Analysis of the GLE # 71 on 17 May 2012 Space Weather cosmic rays solar energetic particles data analysis exposure to radiation aviation dosimetry |
| title | Application of the Verified Neutron Monitor Yield Function for an Extended Analysis of the GLE # 71 on 17 May 2012 |
| title_full | Application of the Verified Neutron Monitor Yield Function for an Extended Analysis of the GLE # 71 on 17 May 2012 |
| title_fullStr | Application of the Verified Neutron Monitor Yield Function for an Extended Analysis of the GLE # 71 on 17 May 2012 |
| title_full_unstemmed | Application of the Verified Neutron Monitor Yield Function for an Extended Analysis of the GLE # 71 on 17 May 2012 |
| title_short | Application of the Verified Neutron Monitor Yield Function for an Extended Analysis of the GLE # 71 on 17 May 2012 |
| title_sort | application of the verified neutron monitor yield function for an extended analysis of the gle 71 on 17 may 2012 |
| topic | cosmic rays solar energetic particles data analysis exposure to radiation aviation dosimetry |
| url | https://doi.org/10.1029/2020SW002626 |
| work_keys_str_mv | AT almishev applicationoftheverifiedneutronmonitoryieldfunctionforanextendedanalysisofthegle71on17may2012 AT sakoldobskiy applicationoftheverifiedneutronmonitoryieldfunctionforanextendedanalysisofthegle71on17may2012 AT igusoskin applicationoftheverifiedneutronmonitoryieldfunctionforanextendedanalysisofthegle71on17may2012 AT lgkocharov applicationoftheverifiedneutronmonitoryieldfunctionforanextendedanalysisofthegle71on17may2012 AT gakovaltsov applicationoftheverifiedneutronmonitoryieldfunctionforanextendedanalysisofthegle71on17may2012 |