Solar Orbiter

Solar Orbiter
Name	Solar Orbiter
Mission type	Solar physics, heliophysics
Operator	European Space Agency · National Aeronautics and Space Administration
COSPAR ID	2020-020A
Launch mass	1850 kg
Dry mass	800 kg
Power	1800 W (solar arrays)
Launch date	2020-02-10
Launch site	Cape Canaveral Air Force Station
Launch vehicle	Atlas V 411
Orbit	Heliocentric, inclined up to 33°
Instruments	Extreme Ultraviolet Imager, Polarimetric and Helioseismic Imager, Spectral Imaging of the Coronal Environment, Energetic Particle Detector, Radio and Plasma Waves, Magnetometer, Solar Wind Analyzer
Programme	ESA Science Programme

Solar Orbiter

Solar Orbiter is a heliophysics spacecraft developed by the European Space Agency in partnership with the National Aeronautics and Space Administration to study the Sun and inner heliosphere. The mission combines remote sensing and in situ measurements to link solar surface phenomena with heliospheric processes, addressing questions central to Heliophysics and Solar physics. Designed to achieve high-latitude observations and close perihelia, the mission builds on heritage from missions such as Ulysses, SOHO, and Parker Solar Probe while supporting objectives of programs including Horizon 2000 and collaborations like the International Living With a Star initiative.

Mission overview

The mission overview summarizes the objectives, timeline, and strategic context for the project as approved by the European Space Agency Council and coordinated with partners such as NASA Headquarters, the Jet Propulsion Laboratory, and industry contractors including Airbus Defence and Space and Science and Technology Facilities Council. Primary objectives focus on the origin and evolution of the solar wind, the structure of the heliosphere, and the solar polar magnetic field evolution as relevant to models used by institutions such as the National Oceanic and Atmospheric Administration and research centers like Max Planck Institute for Solar System Research and Institut d'Astrophysique Spatiale. The mission timeline includes cruise, nominal science phases, and extended operations, aligned with solar cycle planning from observatories such as Greenwich Observatory and forecasting efforts by the Space Weather Prediction Center.

Spacecraft design and instruments

The spacecraft bus was developed by prime contractors including Airbus Defence and Space with contributions from national agencies such as DLR (German Aerospace Center), CNES (French Space Agency), ASI (Italian Space Agency), and UK Space Agency. Its instrument suite comprises remote-sensing and in situ payloads: the Extreme Ultraviolet Imager (EUI), the Polarimetric and Helioseismic Imager (PHI), the Spectral Imaging of the Coronal Environment (SPICE), the Multi Element Telescope for Imaging and Spectroscopy (METIS), the Energetic Particle Detector (EPD), the Radio and Plasma Waves (RPW), the Magnetometer (MAG), and the Solar Wind Analyser (SWA). These instruments were developed by consortia including teams from University of Oxford, University of Birmingham, University of Göttingen, CNRS, INAF, Leibniz Institute for Astrophysics Potsdam, and the Southwest Research Institute. Thermal control techniques, radiator design, and heatshield technologies reference heritage from Parker Solar Probe and manufacturing partners like Thales Alenia Space.

Launch and trajectory

Launched on an Atlas V 411 from Cape Canaveral Air Force Station (Launch Complex 41), the spacecraft executed gravity-assist maneuvers at Venus and a flyby of Earth to adjust inclination and perihelion distance. The trajectory design, produced by teams at ESA/ESOC and NASA JPL, used multiple Venus flybys to raise orbital inclination toward the solar poles, achieving inclinations previously accessed by missions like Ulysses. Perihelion passes reached within 0.28 astronomical units, enabling comparisons with Mercury-era observations from MESSENGER. Navigation and mission planning involved coordination with tracking networks such as the Deep Space Network and the ESA ESTRACK stations at sites including New Norcia and Cebreros.

Science objectives and results

Science objectives targeted the acceleration of the solar wind, the sources of solar energetic particles, the dynamics of the corona, and the structure of the heliospheric magnetic field. Early results published by investigators from institutions like Max Planck Institute for Solar System Research, Harvard-Smithsonian Center for Astrophysics, University of California, Berkeley, Imperial College London, and Observatoire de Paris reported measurements of coronal heating signatures, mapping of magnetic flux transport, and observations of small-scale eruptions linked to coronal mass ejections and solar flares. Comparative studies with data from Parker Solar Probe, SOHO, STEREO, Hinode, SDO, and ground-based facilities such as Daniel K. Inouye Solar Telescope and Big Bear Solar Observatory enhanced understanding of reconnection processes and particle acceleration mechanisms. Peer-reviewed findings appeared in journals including Nature Astronomy, The Astrophysical Journal, Astronomy & Astrophysics, and Science.

Operations and ground segment

Mission operations are conducted from the European Space Operations Centre with science planning coordinated through the Science Operations Centre and instrument teams hosted across institutions such as University of Barcelona, University of Birmingham, and Danish Meteorological Institute. The ground segment comprises mission control, payload operations, data processing pipelines, and archive centers including the European Space Astronomy Centre and national archives at agencies like CNES and DLR. Telemetry, command, and data handling involve cross-support from the Deep Space Network, ESA ESTRACK, and partner facilities including NASA Ames Research Center and GSFC. Science data are calibrated, validated, and distributed to guest investigators via portals maintained by consortia at Godard Space Flight Center and university data centers.

Collaborations and mission management

The mission was managed under ESA’s Science Programme with a Letters of Intent and agreements involving NASA, national agencies such as CNES, DLR, ASI, UK Space Agency, and science institutions including Max Planck Society, CNRS, INAF, and University of Göttingen. Project management, systems engineering, and science management involved program offices at ESTEC, ESOC, and NASA JPL, with industrial partners like Airbus Defence and Space, OHB SE, and Thales Alenia Space. International collaborations extended to research networks including the International Living With a Star and coordination with observatories such as SDO and IRIS for joint campaigns. Data policy, science exploitation, and public outreach were coordinated with entities like ESA Science Communication and national outreach programs at institutions including Smithsonian Astrophysical Observatory.

Category:European Space Agency space probes Category:Solar spacecraft Category:2020 in spaceflight