Variations in the Inferred Cosmic-Ray Spectral Index as Measured by Neutron Monitors in Antarctica ...
A technique has recently been developed for tracking short-term spectral variations in Galactic cosmic rays (GCRs) using data from a single neutron monitor (NM), by collecting histograms of the time delay between successive neutron counts and extracting the leader fraction $L$ as a proxy of the spec...
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Online Access: | https://dx.doi.org/10.48550/arxiv.2408.13999 https://arxiv.org/abs/2408.13999 |
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ftdatacite:10.48550/arxiv.2408.13999 2024-09-15T17:40:24+00:00 Variations in the Inferred Cosmic-Ray Spectral Index as Measured by Neutron Monitors in Antarctica ... Muangha, Pradiphat Ruffolo, David Sáiz, Alejandro Banglieng, Chanoknan Evenson, Paul Seunarine, Surujhdeo Oh, Suyeon Jung, Jongil Duldig, Marc Humble, John 2024 https://dx.doi.org/10.48550/arxiv.2408.13999 https://arxiv.org/abs/2408.13999 unknown arXiv Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 High Energy Astrophysical Phenomena astro-ph.HE Instrumentation and Methods for Astrophysics astro-ph.IM FOS: Physical sciences CreativeWork Preprint Article article 2024 ftdatacite https://doi.org/10.48550/arxiv.2408.13999 2024-09-02T09:27:22Z A technique has recently been developed for tracking short-term spectral variations in Galactic cosmic rays (GCRs) using data from a single neutron monitor (NM), by collecting histograms of the time delay between successive neutron counts and extracting the leader fraction $L$ as a proxy of the spectral index. Here we analyze $L$ from four Antarctic NMs during 2015 March to 2023 September. We have calibrated $L$ from the South Pole NM with respect to a daily spectral index determined from published data of GCR proton fluxes during 2015--2019 from the Alpha Magnetic Spectrometer (AMS-02) aboard the International Space Station. Our results demonstrate a robust correlation between the leader fraction and the spectral index fit over the rigidity range 2.97--16.6 GV for AMS-02 data, with uncertainty 0.018 in the daily spectral index as inferred from $L$. In addition to the 11-year solar activity cycle, a wavelet analysis confirms a 27-day periodicity in the GCR flux and spectral index corresponding to solar ... : 17 pages, 10 figures ... Article in Journal/Newspaper Antarc* Antarctic Antarctica South pole South pole DataCite |
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unknown |
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High Energy Astrophysical Phenomena astro-ph.HE Instrumentation and Methods for Astrophysics astro-ph.IM FOS: Physical sciences |
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High Energy Astrophysical Phenomena astro-ph.HE Instrumentation and Methods for Astrophysics astro-ph.IM FOS: Physical sciences Muangha, Pradiphat Ruffolo, David Sáiz, Alejandro Banglieng, Chanoknan Evenson, Paul Seunarine, Surujhdeo Oh, Suyeon Jung, Jongil Duldig, Marc Humble, John Variations in the Inferred Cosmic-Ray Spectral Index as Measured by Neutron Monitors in Antarctica ... |
topic_facet |
High Energy Astrophysical Phenomena astro-ph.HE Instrumentation and Methods for Astrophysics astro-ph.IM FOS: Physical sciences |
description |
A technique has recently been developed for tracking short-term spectral variations in Galactic cosmic rays (GCRs) using data from a single neutron monitor (NM), by collecting histograms of the time delay between successive neutron counts and extracting the leader fraction $L$ as a proxy of the spectral index. Here we analyze $L$ from four Antarctic NMs during 2015 March to 2023 September. We have calibrated $L$ from the South Pole NM with respect to a daily spectral index determined from published data of GCR proton fluxes during 2015--2019 from the Alpha Magnetic Spectrometer (AMS-02) aboard the International Space Station. Our results demonstrate a robust correlation between the leader fraction and the spectral index fit over the rigidity range 2.97--16.6 GV for AMS-02 data, with uncertainty 0.018 in the daily spectral index as inferred from $L$. In addition to the 11-year solar activity cycle, a wavelet analysis confirms a 27-day periodicity in the GCR flux and spectral index corresponding to solar ... : 17 pages, 10 figures ... |
format |
Article in Journal/Newspaper |
author |
Muangha, Pradiphat Ruffolo, David Sáiz, Alejandro Banglieng, Chanoknan Evenson, Paul Seunarine, Surujhdeo Oh, Suyeon Jung, Jongil Duldig, Marc Humble, John |
author_facet |
Muangha, Pradiphat Ruffolo, David Sáiz, Alejandro Banglieng, Chanoknan Evenson, Paul Seunarine, Surujhdeo Oh, Suyeon Jung, Jongil Duldig, Marc Humble, John |
author_sort |
Muangha, Pradiphat |
title |
Variations in the Inferred Cosmic-Ray Spectral Index as Measured by Neutron Monitors in Antarctica ... |
title_short |
Variations in the Inferred Cosmic-Ray Spectral Index as Measured by Neutron Monitors in Antarctica ... |
title_full |
Variations in the Inferred Cosmic-Ray Spectral Index as Measured by Neutron Monitors in Antarctica ... |
title_fullStr |
Variations in the Inferred Cosmic-Ray Spectral Index as Measured by Neutron Monitors in Antarctica ... |
title_full_unstemmed |
Variations in the Inferred Cosmic-Ray Spectral Index as Measured by Neutron Monitors in Antarctica ... |
title_sort |
variations in the inferred cosmic-ray spectral index as measured by neutron monitors in antarctica ... |
publisher |
arXiv |
publishDate |
2024 |
url |
https://dx.doi.org/10.48550/arxiv.2408.13999 https://arxiv.org/abs/2408.13999 |
genre |
Antarc* Antarctic Antarctica South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica South pole South pole |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.48550/arxiv.2408.13999 |
_version_ |
1810486433382662144 |