NASA GNSS Ionosphere VTEC Fluctuation Grids for Space Weather Analysis

Global ionosphere fluctuation data derived from multiple Global Navigation Satellite System (GNSS) constellations, including GPS, GLONASS, Galileo, and Beidou. The NASA Crustal Dynamics Data Information System (CDDIS) archives daily files containing Vertical Total Electron Content (VTEC) fluctuation measurements, specifically Rate of TEC change Index (ROTI) maps. These maps are produced by International GNSS Service (IGS) Analysis Centers using a global network of ground receivers and have a grid resolution of 2 degrees by 2 degrees.

Use Cases

• Modeling ionospheric irregularities based on the Rate of TEC change Index (ROTI) data.
• Analyzing space weather events using global, daily Vertical Total Electron Content (VTEC) fluctuation grids.
• Correlating satellite signal scintillation with ionospheric activity based on GNSS-derived TEC measurements.
• Studying the impact of solar activity on global ionospheric dynamics using multi-constellation GNSS data.

Strengths

• Data incorporates multiple global satellite constellations (GPS, GLONASS, Galileo, Beidou, QZSS, IRNSS, SBAS) since 2011.
• Derived product includes daily Rate of TEC change Index (ROTI) maps with a defined 2x2 degree grid resolution.
• Produced by International GNSS Service (IGS) Analysis Centers using a global network of ground receivers.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• File formats include BIN and ISO, which may require specialized tools for processing.

Provenance

Source

National Aeronautics and Space Administration (NASA) Crustal Dynamics Data Information System (CDDIS)

Collection Method

Derived from GNSS observations by International GNSS Service (IGS) Analysis Centers.

Time Range

Daily files; archive includes data from other GNSS constellations since 2011.

Freshness

Last updated 2026-03-13 02:12:19.678497; freshness should be verified.

Geography

Global coverage.