ACE CRIS Cosmic Ray Isotope Flux Measurements

27-day Bartels Rotation periods structure the time-averaged energetic charged particle fluxes. The dataset contains flux data for 24 elements across seven energy ranges per element, collected by the Cosmic Ray Isotope Spectrometer on NASA's Advanced Composition Explorer spacecraft. The instrument was designed with greater collection power than previous satellite instruments.

Use Cases

• Analyze temporal patterns in hourly, daily, and 27-day averaged particle fluxes for elements like Fe, O, and Si to study solar modulation effects.
• Compare isotopic composition and flux intensities across the 24 available elements (B through Ni) to investigate cosmic-ray origin theories.
• Model energy spectra by utilizing the seven distinct energy ranges provided for each elemental flux measurement.
• Correlate flux variations across Bartels Rotations with other solar and heliospheric datasets to understand solar rotation impacts.

Strengths

• Data covers 24 distinct elements from Boron to Nickel.
• Fluxes are averaged over three temporal resolutions: hourly, daily, and 27-day Bartels Rotations.
• Instrument collection power is noted as ~250 cm2*sr, exceeding previous satellite capabilities.

Limitations

• Specific row count, temporal coverage start date, and update recency are unknown.
• Data availability is limited to 24 specified elements, excluding others.
• Energy ranges differ per element, complicating direct cross-element spectral comparisons.

Provenance

Source

NASA Advanced Composition Explorer (ACE) spacecraft, Cosmic Ray Isotope Spectrometer (CRIS) instrument.

Collection Method

Satellite-based spectrometry measurements of Galactic Cosmic Rays, processed into Level 2 time-averaged fluxes.

Time Range

Organized into 27-day Bartels Rotation periods. Specific start and end dates are unknown.

Geography

Measurements taken in space at the ACE spacecraft location, approximately at the L1 Lagrange point.