BARREL 3C: Bremsstrahlung X-ray Spectra from Stratospheric Balloons

Antarctic and Arctic stratospheric balloon campaigns collected fast time-resolution X-ray spectra to study electron precipitation from Earth's radiation belts. The BARREL mission, a NASA Living with a Star Mission of Opportunity, launched over 50 balloons from Halley Bay, SANAE IV, and Kiruna between 2013 and 2016. Data from six spectrometer channels (FSPC1a-FSPC4) cover an energy range from 0 MeV to 1.5 MeV.

Use Cases

• Modeling electron loss rates from radiation belts based on measured Bremsstrahlung X-ray spectra.
• Analyzing spatial and temporal variations of precipitation based on balloon array measurements across magnetic local time.
• Correlating precipitation events with in-situ plasma wave and particle data from the Van Allen Probes mission.
• Characterizing the spatial scale of relativistic electron precipitation based on multi-balloon observations.

Strengths

• Data includes six distinct spectrometer channels (FSPC1a, FSPC1b, FSPC1c, FSPC2, FSPC3, FSPC4) for spectral separation.
• Fast time resolution of 50 milliseconds enables detailed temporal analysis of precipitation events.
• Campaigns spanned four years (2013-2016) and multiple launch sites, providing longitudinal coverage.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic bias inherent to the Antarctic and Arctic launch locations.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Measured by X-ray spectrometers and DC magnetometers carried on stratospheric balloons.

Time Range

2013 to 2016

Freshness

Last updated 2026-03-13 03:37:02.253271; freshness should be verified.

Geography

Balloon launches from Halley Bay (Antarctica), SANAE IV (Antarctica), and Kiruna (Sweden); observations near Antarctic and Arctic circles.