AMS Data Reveals Charged Particle Variations in Heliosphere Over Solar Cycle

AMS observations highlight charged particle variations linked to solar cycles, impacting cosmic ray flux in the heliosphere.

Written by Gadgets 360 Staff | Updated: 10 February 2025 15:00 IST

AMS Data Reveals Charged Particle Variations in Heliosphere Over Solar Cycle

Photo Credit: Physical Review Letters (2025)

Researchers using AMS on the ISS identify charged particle variations in the heliosphere's solar cycle.

Highlights

AMS data shows charged particle shifts over an 11-year solar cycle
Antiproton fluxes and cosmic nuclei exhibit variations in the heliosphe
Solar modulation influences cosmic ray movement and energy levels

Variations in charged particles moving through the heliosphere over an 11-year solar cycle have been identified by researchers analysing data from the Alpha Magnetic Spectrometer (AMS) aboard the International Space Station. Shifts in the heliospheric magnetic field and their impact on particle movement have been examined, with trends observed in antiproton and cosmic nuclei fluxes. The findings are based on 11 years of data collected by the AMS, highlighting the influence of solar modulation on cosmic rays.

Charged Particle Behaviour in the Heliosphere

According to two research papers published in Physical Review Letters, fluctuations in the heliospheric magnetic field affect the movement and interaction of charged particles within the heliosphere. These particles originate from both the sun and galactic cosmic rays (GCRs) entering from beyond the solar system. The AMS has measured variations in mass and energy, revealing how these charged particles respond to solar activity.

Impact on Antiprotons and Cosmic Nuclei

The study identified trends in antiproton behaviour, showing changes in flux levels based on heliospheric conditions. Data indicate that antiproton fluxes exhibit notable temporal variations up to approximately 10 GV, with decreasing fluctuations at higher rigidity levels. Cosmic nuclei, including helium, lithium, beryllium, boron, nitrogen, carbon, and oxygen, were also analysed, showing similar patterns in flux variations. Correlations were established between changes in solar modulation and fluctuations in cosmic nuclei fluxes.

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Long-Term Observations of Solar Modulation

The AMS data set spans more than a single solar cycle, providing an opportunity to study long-term variations. Changes in the heliospheric magnetic field have been observed to influence the behaviour of GCRs, affecting their energy levels and interactions. The study's findings contribute to a deeper understanding of cosmic ray propagation and solar activity's role in shaping the space environment.

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