Citation

MMS4 MEC Burst Level 2 Ephemeris SPASE Dataset

The source record for the public NASA MMS4 burst product used by the exhibit cache.

Retrieved: 2026-06-27 Source: doi.org Confidence: high

Summary

The DOI resolves to the SPASE metadata page for `MMS4_MEC_BRST_L2_EPHT89D`, a NASA MMS4 ephemeris burst product with 30 ms cadence. The exhibit uses a cached HAPI CSV slice from this dataset so the page can open without a server.

Key Facts

  • DOI redirect target: `https://spase-metadata.org/NASA/NumericalData/MMS/4/Ephemeris/Burst/Level2/Tsyganenko_89_Dynamic/PT0.030S`.
  • HAPI info endpoint: `https://cdaweb.gsfc.nasa.gov/hapi/info?id=MMS4_MEC_BRST_L2_EPHT89D`.
  • HAPI metadata reports coverage from `2015-12-06T00:23:05Z` to `2026-02-14T10:55:32Z`.
  • Selected parameters include magnetic latitude, magnetic local time, Kp, Dst, GSM position, GSM velocity, and field-line type.
  • CDAWeb HAPI requires selected parameters to be requested in metadata order.

Applied in the Build

The Three.js scene uses true-scale Earth context for the GSM position and a separate magnified local motion lens for the short burst path. Field-line type is treated as categorical topology, not a continuous scalar.

Provenance and parameter definitions appear in the Source stage so visitors can distinguish observed values from visualization scale transforms.

Citation

Primary source: https://doi.org/10.48322/aj2h-2391

Build note: `mms4/research/spase-mms4-mec-brst-l2-epht89d.md`