Properties of Daily Helium Fluxes

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dc.contributor.authorYashin II
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dc.contributor.authorYu YM
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dc.contributor.authorZannoni M
dc.contributor.authorZhang C
dc.contributor.authorZhang F
dc.contributor.authorZhang FZ
dc.contributor.authorZhang JH
dc.contributor.authorZhang Z
dc.contributor.authorZhao F
dc.contributor.authorZheng C
dc.contributor.authorZheng ZM
dc.contributor.authorZhuang HL
dc.contributor.authorZhukov V
dc.contributor.authorZichichi A
dc.contributor.authorZuccon P
dc.contributor.authorAMS Collaboration
dc.contributor.organizationfi=avaruustutkimuslaboratorio|en=Space Research Laboratory|
dc.contributor.organization-code1.2.246.10.2458963.20.47833719389
dc.contributor.organization-code2606702
dc.converis.publication-id175912495
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/175912495
dc.date.accessioned2022-10-28T13:22:10Z
dc.date.available2022-10-28T13:22:10Z
dc.description.abstractWe present the precision measurement of 2824 daily helium fluxes in cosmic rays from May 20, 2011 to October 29, 2019 in the rigidity interval from 1.71 to 100 GV based on 7.6 x 10(8) helium nuclei collected with the Alpha Magnetic Spectrometer (AMS) aboard the International Space Station. The helium flux and the helium to proton flux ratio exhibit variations on multiple timescales. In nearly all the time intervals from 2014 to 2018, we observed recurrent helium flux variations with a period of 27 days. Shorter periods of 9 days and 13.5 days are observed in 2016. The strength of all three periodicities changes with time and rigidity. In the entire time period, we found that below similar to 7 GV the helium flux exhibits larger time variations than the proton flux, and above similar to 7 GV the helium to proton flux ratio is time independent. Remarkably, below 2.4 GV a hysteresis between the helium to proton flux ratio and the helium flux was observed at greater than the 7 sigma level. This shows that at low rigidity the modulation of the helium to proton flux ratio is different before and after the solar maximum in 2014.
dc.identifier.jour-issn0031-9007
dc.identifier.olddbid181586
dc.identifier.oldhandle10024/164680
dc.identifier.urihttps://www.utupub.fi/handle/11111/38481
dc.identifier.urlhttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.231102
dc.identifier.urnURN:NBN:fi-fe2022091258610
dc.language.isoen
dc.okm.affiliatedauthorTorsti, Jarmo
dc.okm.affiliatedauthorVainio, Rami
dc.okm.affiliatedauthorValtonen, Eino
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.discipline115 Avaruustieteet ja tähtitiedefi_FI
dc.okm.internationalcopublicationinternational co-publication
dc.okm.internationalityInternational publication
dc.okm.typeA1 ScientificArticle
dc.publisherAMER PHYSICAL SOC
dc.publisher.countryUnited Statesen_GB
dc.publisher.countryYhdysvallat (USA)fi_FI
dc.publisher.country-codeUS
dc.relation.articlenumber231102
dc.relation.doi10.1103/PhysRevLett.128.231102
dc.relation.ispartofjournalPhysical Review Letters
dc.relation.issue23
dc.relation.volume128
dc.source.identifierhttps://www.utupub.fi/handle/10024/164680
dc.titleProperties of Daily Helium Fluxes
dc.year.issued2022

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