TWINS 1: Plasma Sheet Ion Temperature Images from ENA Measurements During Storms

NASA's TWINS-1 instrument provides stereoscopic energetic neutral atom (ENA) imaging of Earth's magnetosphere from a Molniya orbit. The dataset includes plasma sheet ion temperature images calculated from ENA measurements during storms, with a time resolution of 60 seconds and an effective cadence of 72 or 85 seconds. Data collection began in April 2007, with a nominal instrument design lifetime of four years.

Use Cases

• Modeling magnetospheric ion temperature dynamics during geomagnetic storms based on energetic neutral atom (ENA) imaging.
• Analyzing global connectivity within the magnetosphere using stereoscopic imaging from two widely spaced spacecraft.
• Studying the neutral hydrogen geocorona density using the Lyman-alpha detector data for flux extraction.
• Investigating temporal changes in the plasma sheet with data acquired at 60-second resolution during apogee.

Strengths

• Data is sourced from a NASA-funded stereo mission with two identical instruments (TWINS-1 and TWINS-2), providing stereoscopic coverage.
• Images have a defined time resolution of 60 seconds and an effective cadence of 72 or 85 seconds.
• Instruments capture a broad energy range from approximately 1 keV to 100 keV.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The exact launch dates for the spacecraft are not available in the provided metadata.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Measured by the TWINS-1 Energetic Neutral Atom (ENA) Imager and Lyman-alpha detector on a spacecraft in a Molniya orbit.

Time Range

TWINS-1 instrument high voltages turned on in April 2007. Nominal design lifetime is four years.

Freshness

Last updated 2026-03-13 05:43:31.913991; freshness should be verified.

Geography

Global imaging of Earth's magnetosphere, with data collected during the apogee portion of each orbit.