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Explorer: ICON (Helio-EX 1)

ICON (Helio-EX 1) [OSC]

ICON (Ionospheric Connection) will explore the boundary between Earth and space – the ionosphere – to understand the physical connection between our world and the immediate space environment around us. This region, where ionized plasma and neutral gas collide and react exhibits dramatic variability that affects space-based technological systems like GPS.

Though the solar inputs are now well quantified, the drivers of ionospheric variability originating from lower atmospheric regions are not. ICON is the first space mission to simultaneously retrieve all of the properties of the system that both influence and result from the dynamical and chemical coupling of the atmosphere and ionosphere. ICON achieves this through an innovative measurement technique that combines remote optical imaging and in situ measurements of the plasma. With this approach, ICON gives us the ability to (1) separate the drivers and pinpoint the real cause of ionospheric variability (2) explain how energy and momentum from the lower atmosphere propagate into the space environment, and (3) explain how these drivers set the stage for the extreme conditions of solar-driven magnetic storms. ICON’s imaging capability combined with its in-situ measurements on the same spacecraft (Figure 1) gives a perspective of the coupled system that would otherwise require two or more orbiting observatories.

ICON targets the low-latitude ionosphere because recent global-scale observations of this region show remarkable spatial and temporal variability that contravene the conventional view of ion-neutral coupling in space, and evince strong forcing by lower atmosphere drivers. The coupling of the atmosphere to space is strongest at these latitudes because the atmospheric waves are largest and so is the density of the space plasma, produced in abundance by the sun overhead and confined by the magnetic field.

Following instruments are on boards:

  • MIGHTI (Michelson Interferometer for Global High-Resolution Thermospheric Imaging): Remotely measuring the neutral wind field and temperatures – Heritage from SHIMMER flown on STPSat-1.
  • EUV (Extreme Ultra-Violet): Measuring the height and density of the daytime ionosphere – Heritage from SPEAR flown on the Korean STSAT-1.
  • FUV (Far Ultra-Violet): Measuring the daytime atmospheric composition and the ionosphere at night – Heritage from FUV flown on IMAGE.
  • IVM (Ion Velocity Meter): Measuring the electric fields detected at the satellite – Heritage from IVM flown on C/NOFS CINDI.

Orbital was selected to provide a LEOStar-2 based bus.

ICON will launch by 2017 into a low earth orbit, operating for at least two years. A Pegasus-XL launch vehicle was selected in November 2013 for a launch in 2017.

Nation: USA
Type / Application: Research, ionosphere
Operator: University of California, Berkeley for NASA
Contractors: Orbital Sciences Corporation (OSC)
Equipment: MIGHTI, EUV, FUV, IVM
Configuration: LEOStar-2
Propulsion: ?
Power: 2 deployable solar arrays, batteries
Lifetime: 2 years
Mass: 272 kg
Orbit: 575 km × 575 km, 27°
Satellite COSPAR Date LS Launch Vehicle Remarks
ICON (Helio-EX 1) - 2017 Kw RW06/24 Pegasus-XL


Further Helio-EX missions: