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Wind

Wind [NASA]

The main purpose of the Wind spacecraft is to measure the incoming solar wind, magnetic fields and particles, although early on it will also observe the Earth's foreshock region. Wind, together with Geotail, Polar, SOHO, and Cluster projects, constitute a cooperative scientific satellite project designated the International Solar Terrestrial Physics (ISTP) program which aims at gaining improved understanding of the physics of solar terrestrial relations.

Wind has on-board propulsion and its design lifetime is three to five years, with redundant subsystems. Wind is cylindrical, approximately 2.8 m in diameter by 1.25 m high, with body-mounted solar cells. It has long wire spin-plane antennas, inertial booms, and spin-plane appendages to support sensors. Wind has experiment booms deployed along both Z axes. The spin rate is 20 rpm around an axis within 1 degree of normal to the ecliptic.

Data are stored using on-board tape recorders and are relayed to the Deep Space Network at one of two rates: 5.5 or 11.1 kbps.

For the first nine months of operation, Wind was placed in a double-lunar swingby orbit near the ecliptic plane, with apogee from 80 to 250 Earth radii and perigee of between 5 and 10 Earth radii. In this orbit, lunar gravity assists were used to keep its apogee over the day hemisphere of the Earth, and magnetospheric observations are made. Wind was then inserted into a small "halo" orbit, about the sunward Sun-Earth gravitational equilibrium point (L1), varying from 235 to 265 Earth radii. In this orbit Wind measures the incoming solar wind, magnetic fields and particles continuously and provides an approximately one-hour warning to the other ISTP spacecraft of changes in the solar wind.

Following instruments are mounted on the spacecraft:

  • Hot Plasma and Charged Particles (3DP)
  • Transient Gamma Ray and EUV Spectrometer (TGRS)
  • Magnetic Fields Instrument (MFI)
  • Plasma and Radio Waves (WAVES)
  • Solar Wind Experiment (SWE)
  • Solar Wind and Suprathermal Ion Composition Studies (SWICS/STICS)
  • Gamma Ray Burst Detector (KONUS)
  • Energetic Particle Acceleration, Composition and Transport (EPACT)
Nation: USA
Type / Application: Scientific
Operator: NASA
Contractors: Lockheed Martin Astro
Equipment: 3DP, TGRS, MFI, WAVES, SWE, SWICS/STICS, KONUS, EPACT
Configuration:
Propulsion:
Power: Solar cells, batteries
Lifetime: 2 years
Mass:
Orbit: L1 halo orbit
Satellite COSPAR Date LS Launch Vehicle Remarks
Wind 1994-071A 01.11.1994 CC LC-17B Delta-7925-10

References:

  • NSSDC Master Catalog: Wind
Further ISTP missions: