Precision Measurement of the Precision Measurement of the Monthly - - PowerPoint PPT Presentation

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Precision Measurement of the Precision Measurement of the Monthly - - PowerPoint PPT Presentation

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Precision Measurement of the Precision Measurement of the Monthly Fluxes in Cosmic Rays Monthly Fluxes in Cosmic Rays with the Alpha Magnetic with the Alpha Magnetic Spectrometer on the ISS Spectrometer on the ISS Cristina Consolandi

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Cristina Consolandi Cristina Consolandi On behalf of the AMS Collaboration On behalf of the AMS Collaboration

Precision Measurement of the Precision Measurement of the Monthly Fluxes in Cosmic Rays Monthly Fluxes in Cosmic Rays with the Alpha Magnetic with the Alpha Magnetic Spectrometer on the ISS Spectrometer on the ISS

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AMS Measurement Period

AMS AMS Cycle 24 Cycle 24 Cycle 23 Cycle 23 Cycle 22 Cycle 22

AMS is a TeV precision, multipurpose, magnetic spectrometer,

  • n the ISS since May 2011.

AMS is measuring GCR fluxes and their time variation. AMS will study the solar modulation effect and the short-term solar activity in the present (24th) and next solar cycle for the live-time of the ISS.

Daily sunspot number: http://www.sidc.be/silso/datafjles

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AMS Detector and Particles and Nuclei Identification

Transition Radiation Detector

  • e+ e- identification

Time-of-Flight counter

  • Trigger
  • Velocity
  • Particle flight direction
  • Charge

Silicon Tracker + Magnet

  • Rigidity
  • Charge & sign

Electromagnetic Calorimeter

  • e+ e- identification
  • e+ e- Energy

Ring Imaging Cherenkov detector

  • Velocity
  • Charge
  • +

See A. Kounine Highlight Talk CRD, Saturday July 15th / Other AMS talks on parallel CRD July 13th - 14th

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AMS Contribution to Solar Modulation

Simultaneous multi-particle measurements. Fine rigidity resolution. Total uncertainty at the percentage level. Short integration time. Continuous particle measurement over one solar cycle. Detailed time evolution of GCR during both periods of maximum and minimum of solar activity. AMS measurements will help to understand the propagation of charged particles in heliosphere and to test diffusion and drift models.

See V. Bindi Highlight Talk SH, Monday July 17th

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AMS Proton Flux vs. Time & Rigidity

May 2011- May 2016

Time

Proton

Flux Intensity

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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AMS Proton & Helium Monthly Fluxes

Proton Helium

Each color corresponds to an integration time of 27 days

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Normalized Proton Flux Evolution

2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

Proton May2011

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Normalized Proton Flux Evolution

2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

Proton Sep2011

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Normalized Proton Flux Evolution

2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

Proton Mar2012

See M. Palermo Talk on parallel session SH039, Monday July 17th

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Proton Jul2012

Normalized Proton Flux Evolution

2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV

Preliminary Data. Please refer to the AMS forthcoming publication in PRL Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Proton May2013

Normalized Proton Flux Evolution

2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV

Preliminary Data. Please refer to the AMS forthcoming publication in PRL Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Normalized Proton Flux Evolution

2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

Proton Feb2014

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Proton Mar2015

Normalized Proton Flux Evolution

2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV

Preliminary Data. Please refer to the AMS forthcoming publication in PRL Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Proton Nov2015

Normalized Proton Flux Evolution

2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV

Preliminary Data. Please refer to the AMS forthcoming publication in PRL Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Proton May2016

Normalized Proton Flux Evolution

2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV 2.15-2.40 GV 2.15-2.40 GV 5.37-5.90 GV 5.37-5.90 GV 10.10-11.00 GV 10.10-11.00 GV 1.16-1.33 GV 1.16-1.33 GV 1.51-1.71 GV 1.51-1.71 GV 3.29-3.64 GV 3.29-3.64 GV 41.90-45.10 GV 41.90-45.10 GV

Preliminary Data. Please refer to the AMS forthcoming publication in PRL Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Helium Normalized Flux & Time Profile

41.90-45.10 GV 41.90-45.10 GV 10.10-11.00 GV 10.10-11.00 GV 5.37-5.90 GV 5.37-5.90 GV 3.29-3.64 GV 3.29-3.64 GV 2.15-2.40 GV 2.15-2.40 GV 1.51-1.71 GV 1.51-1.71 GV

Helium May2011-Feb2014 Helium Feb2014-May2016 Helium

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

Preliminary Data. Please refer to the AMS forthcoming publication in PRL Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Electron and Positron Monthly Fluxes

Electron Positron

Preliminary Data. Please refer to the AMS forthcoming publication in PRL Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Monthly e+ and e- flux Time profile

e- Flux [m-2 s-1 sr-1 GeV-1] e+ Flux [m-2 s-1 sr-1 GeV-1]

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Monthly e+ and e- flux Time profile

e- Flux [m-2 s-1 sr-1 GeV-1] e+ Flux [m-2 s-1 sr-1 GeV-1]

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Monthly e+ and e- flux Time profile

e- Flux [m-2 s-1 sr-1 GeV-1] e+ Flux [m-2 s-1 sr-1 GeV-1]

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Monthly e+ and e- flux Time profile

e- Flux [m-2 s-1 sr-1 GeV-1] e+ Flux [m-2 s-1 sr-1 GeV-1]

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Monthly e+ and e- flux Time profile

e- Flux [m-2 s-1 sr-1 GeV-1] e+ Flux [m-2 s-1 sr-1 GeV-1]

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Particle Drift

A<0 e- are less modulated than e+ A>0 e- are more modulated than e+

Polarity Inversion: Nov2012-Mar2014

South North Average

A<0 A>0

Drift direction of positrons in A>0 epochs

  • r electrons A<0

Drift direction of positrons in A<0 epochs

  • r electrons A>0

Sun's Magnetic filed data from Wilcox Solar Observatory http://wso.stanford.edu/ Polarity inversion period from: X. Sun et al., Astroph. J., 798, 114 (2015)

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AMS Positron over Electron

Charge-sign dependent modulation

Polarity Inversion: Nov2012-Mar2014

A<0 A>0

[2.0-2.3] GeV

Polarity inversion period from: X. Sun et al., Astroph. J., 798, 114 (2015)

Preliminary Data. Please refer to the AMS forthcoming publication in PRL

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Summary & Conclusions

AMS p,He, e+,e- monthly fluxes were measured during the ascending phase of solar cycle 24 through its maximum and descending phase. All particles show sub-structures related to the short-term solar activity. AMS e+/e- ratio clearly shows the charge-sign dependence of solar modulation. AMS will measure all GCR nuclei and anti-proton fluxes in the present (24th) and next solar cycle.