TWINS 2: Plasma Sheet Ion Temperature Images During Storms from ENA Measurements

TWINS-2 provides stereoscopic energetic neutral atom (ENA) imaging of Earth's magnetosphere from a high-altitude Molniya orbit. The NASA-funded instrument captures images with a time resolution of 60 seconds, operating during the apogee portion of its 12-hour orbit to avoid radiation belts. Data collection began after the instrument's high voltages were turned on in May 2008.

Use Cases

• Modeling global magnetospheric connectivity based on stereoscopic imaging from two spacecraft.
• Analyzing ion temperature dynamics during geomagnetic storms based on energetic neutral atom (ENA) measurements.
• Calibrating magnetospheric ion flux extraction using co-located Lyman-alpha detector measurements of the hydrogen geocorona.
• Studying temporal evolution of the plasma sheet with image data collected at 72-85 second effective cadence.

Strengths

• Provides stereoscopic imaging from two widely spaced spacecraft, enabling 3D analysis.
• Data collection has a defined time resolution of 60 seconds per image.
• Instruments have a nominal design lifetime of four years, suggesting sustained data collection.

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

Collection Method

Measured by the TWINS-2 instrument, an Energetic Neutral Atom (ENA) Imager and Lyman-alpha detector on a non-NASA U.S. Government spacecraft.

Time Range

Instrument high voltages turned on in May 2008; nominal four-year design lifetime.

Freshness

Last updated 2026-03-13 09:25:56.463792; freshness should be verified.

Geography

Global coverage of Earth's magnetosphere, with spacecraft in a Molniya orbit (63.4° inclination, 7.2 Earth radii apogee).