Autor: |
Mishev, Alexander L., Kocharov, Leon G., Koldobskiy, Sergey A., Larsen, Nicholas, Riihonen, Esa, Vainio, Rami, Usoskin, Ilya G. |
Předmět: |
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Zdroj: |
Solar Physics; Jul2022, Vol. 297 Issue 7, p1-23, 23p |
Abstrakt: |
The first ground-level enhancement of the current Solar Cycle 25 occurred on 28 October 2021. It was observed by several space-borne and ground-based instruments, specifically neutron monitors. A moderate count-rate increase over the background was observed by high-altitude polar stations on the South Pole and Dome C stations at the Antarctic plateau. Most of the neutron monitors registered only marginal count-rate increases. Using detrended records and employing a method verified by direct space-borne measurements, we derive the rigidity spectra and angular distributions of the incoming solar protons in the vicinity of Earth. For the analysis, we employed a newly computed and parameterized neutron-monitor yield function. The rigidity spectra and anisotropy of solar protons were obtained in their time evolution throughout the event. A comparison with the Solar and Heliospheric Observatory/Energetic and Relativistic Nuclei and Electron (SOHO/ENRE) experiment data is also performed. We briefly discuss the results derived from our analysis. [ABSTRACT FROM AUTHOR] |
Databáze: |
Complementary Index |
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