Properties of Daily Helium Fluxes

(AMS Collaboration)

doi:10.1103/PhysRevLett.128.231102

Properties of Daily Helium Fluxes

(AMS Collaboration)

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

We 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 7.6×108 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 ∼7 GV the helium flux exhibits larger time variations than the proton flux, and above ∼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 7σ 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.

Original language	English
Article number	231102
Journal	Physical Review Letters
Volume	128
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.128.231102
State	Published - 10 Jun 2022

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10.1103/PhysRevLett.128.231102

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@article{d0a645b22c49441e97b7247cfb24a09c,

title = "Properties of Daily Helium Fluxes",

abstract = "We 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 7.6×108 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 ∼7 GV the helium flux exhibits larger time variations than the proton flux, and above ∼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 7σ 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.",

author = "{(AMS Collaboration)} and M. Aguilar and Cavasonza, {L. Ali} and G. Ambrosi and L. Arruda and N. Attig and F. Barao and L. Barrin and A. Bartoloni and {Ba{\c s}eǧmez-Du Pree}, S. and R. Battiston and M. Behlmann and J. Berdugo and B. Bertucci and V. Bindi and K. Bollweg and B. Borgia and Boschini, {M. J.} and M. Bourquin and Bueno, {E. F.} and J. Burger and Burger, {W. J.} and S. Burmeister and Cai, {X. D.} and M. Capell and J. Casaus and G. Castellini and F. Cervelli and Chang, {Y. H.} and Chen, {G. M.} and Chen, {G. R.} and Chen, {H. S.} and Y. Chen and L. Cheng and Chou, {H. Y.} and S. Chouridou and V. Choutko and Chung, {C. H.} and C. Clark and G. Coignet and C. Consolandi and A. Contin and C. Corti and Z. Cui and K. Dadzie and A. Dass and C. Delgado and {Della Torre}, S. and Demirk{\"o}z, {M. B.} and L. Derome and {Di Falco}, S.",

note = "Publisher Copyright: {\textcopyright} 2022 authors. Published by the American Physical Society.",

year = "2022",

month = jun,

day = "10",

doi = "10.1103/PhysRevLett.128.231102",

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volume = "128",

journal = "Physical Review Letters",

issn = "0031-9007",

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TY - JOUR

T1 - Properties of Daily Helium Fluxes

AU - (AMS Collaboration)

AU - Aguilar, M.

AU - Cavasonza, L. Ali

AU - Ambrosi, G.

AU - Arruda, L.

AU - Attig, N.

AU - Barao, F.

AU - Barrin, L.

AU - Bartoloni, A.

AU - Başeǧmez-Du Pree, S.

AU - Battiston, R.

AU - Behlmann, M.

AU - Berdugo, J.

AU - Bertucci, B.

AU - Bindi, V.

AU - Bollweg, K.

AU - Borgia, B.

AU - Boschini, M. J.

AU - Bourquin, M.

AU - Bueno, E. F.

AU - Burger, J.

AU - Burger, W. J.

AU - Burmeister, S.

AU - Cai, X. D.

AU - Capell, M.

AU - Casaus, J.

AU - Castellini, G.

AU - Cervelli, F.

AU - Chang, Y. H.

AU - Chen, G. M.

AU - Chen, G. R.

AU - Chen, H. S.

AU - Chen, Y.

AU - Cheng, L.

AU - Chou, H. Y.

AU - Chouridou, S.

AU - Choutko, V.

AU - Chung, C. H.

AU - Clark, C.

AU - Coignet, G.

AU - Consolandi, C.

AU - Contin, A.

AU - Corti, C.

AU - Cui, Z.

AU - Dadzie, K.

AU - Dass, A.

AU - Delgado, C.

AU - Della Torre, S.

AU - Demirköz, M. B.

AU - Derome, L.

AU - Di Falco, S.

PY - 2022/6/10

Y1 - 2022/6/10

N2 - We 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 7.6×108 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 ∼7 GV the helium flux exhibits larger time variations than the proton flux, and above ∼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 7σ 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.

AB - We 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 7.6×108 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 ∼7 GV the helium flux exhibits larger time variations than the proton flux, and above ∼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 7σ 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.

UR - http://www.scopus.com/inward/record.url?scp=85132341836&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.128.231102

DO - 10.1103/PhysRevLett.128.231102

M3 - 期刊論文

C2 - 35749176

AN - SCOPUS:85132341836

SN - 0031-9007

VL - 128

JO - Physical Review Letters

JF - Physical Review Letters

IS - 23

M1 - 231102

ER -

Properties of Daily Helium Fluxes

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