New reconstruction of the event-integrated spectra for GLE events
Koldobskiy, Sergey; Raukunen, Osku; Vainio, Rami; Kovaltsov, Gennady; Usoskin, Ilya (2021-07-05)
Koldobskiy, S., Raukunen, O., Vainio, R., Kovaltsov, G., & Usoskin, I. (2021, July 5). New reconstruction of the event-integrated spectra for GLE events. Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021). 37th International Cosmic Ray Conference. https://doi.org/10.22323/1.395.1273
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https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2021081643398
Tiivistelmä
Abstract
Here we report a new reconstruction of the event-integrated spectra of solar energetic particles(SEP) detected by neutron monitor (NM) network and space-borne detectors (mainly GOESdata) during ground-level enhancement (GLE) events. The reconstruction of SEP fluences isbased on the “bow-tie” method employing the latest advances in the NM data analysis (a time-dependent GCR background and the use of the NM yield function directly verified with theAMS-02 experiment data), usage of different space-borne detectors data and a detailed study ofdifferent uncertainties. As a result of this work, we obtained integral fluences of SEPs in theenergy range from 30 MeV to a few GeV for 58 moderate and strong GLE events since 1956.The results were fitted with the modified Band-function (a double power-law function with twoexponential cutoffs). An easy-to-use presentation of SEP fluences in the form of an analyticalexpression forms a solid basis for new studies in different fields, such as the influence of SEPs onthe atmosphere and a statistical study of extreme solar activity.
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