Parker Solar Probe

Parker Solar Probe
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Name	Parker Solar Probe
Mission type	Solar probe
Operator	NASA
Cospar id	2018-065A
Satcat	43508
Mission duration	Primary: 7 years (planned)
Manufacturer	Applied Physics Laboratory (Johns Hopkins UniversityAPL)
Launch mass	685 kg
Power	Solar panels
Launch date	August 12, 2018
Launch rocket	Delta IV Heavy
Launch site	Cape Canaveral Air Force Station Space Launch Complex 37
Orbit reference	Heliocentric
Perihelion	~9.86 solar radii

Parker Solar Probe is a NASA heliophysics spacecraft designed to study the outer corona of the Sun by making progressively closer approaches. Developed and built by the Johns Hopkins University Applied Physics Laboratory for the NASA Heliophysics Division, the probe performs repeated solar encounters using gravitational assists from Venus to reduce perihelion distance, enabling in situ measurements of the solar wind, magnetic fields, and energetic particles. The mission addresses long-standing questions raised by solar physicists and connects observations from observatories such as SOHO, STEREO, and Solar Dynamics Observatory with ground-based facilities like Mauna Loa Solar Observatory.

Mission overview

The mission concept originated from proposals influenced by the work of Eugene Parker, whose theories on the solar wind and coronal heating problem reshaped heliophysics. Managed by NASA and executed by the Johns Hopkins University Applied Physics Laboratory, the probe leverages technologies pioneered in missions including Ulysses, Pioneer 10, Voyager 1, and Solar Orbiter. Objectives align with priorities from the National Academy of Sciences decadal surveys and coordination with programs such as Living With a Star and the Heliophysics System Observatory. The mission cost shares, industrial partnerships, and oversight involved organizations such as Lockheed Martin, Ball Aerospace, and Aerojet Rocketdyne.

Spacecraft design and instruments

The spacecraft features a heat shield built from carbon-composite materials developed with expertise from NASA Goddard Space Flight Center and industrial contractors, protecting a sensor suite in a thermal shadow. Instrument heritage links to payloads on Magnetospheric Multiscale Mission, ACE (Advanced Composition Explorer), and Ulysses. The science payload includes magnetometers, plasma detectors, and particle analyzers developed by teams from institutions such as University of California, Berkeley, Princeton University, University of Michigan, Smithsonian Astrophysical Observatory, Stanford University, University of Colorado Boulder, University of New Hampshire, University of Iowa, University of California, Los Angeles, Johns Hopkins University, University of Arizona, Boston University, and NASA Ames Research Center.

Primary instruments consist of a suite analogous to those on Cluster II and MMS (Magnetospheric Multiscale), including a fluxgate magnetometer built with collaboration from Imperial College London and University of Oxford partners, plasma probes descended from designs used on ACE and Wind, and energetic particle detectors with lineage tracing to SOHO instruments. Thermal control integrates solar panel deployment concepts refined on Landsat and Terra missions, while avionics borrow from platforms like Mars Reconnaissance Orbiter and Juno to ensure autonomy during perihelion.

Launch and trajectory

Launched on a Delta IV Heavy from Cape Canaveral Air Force Station SLC-37 by United Launch Alliance on August 12, 2018, the trajectory employed multiple gravity assists at Venus to shrink orbital perihelion, a strategy also used by missions such as MESSENGER at Mercury and Cassini at Saturn. The flight dynamics team included experts with experience from Jet Propulsion Laboratory navigation of Voyager and Galileo. Trajectory planning referenced solar sail studies and concepts from missions like HiRiSE and included trajectory correction maneuvers using engines developed by Aerojet Rocketdyne.

Perihelion passes reached record solar proximities previously only approached conceptually in studies tied to Helios missions, surpassing distances achieved by Parker’s namesake theory tests and complementing observations by Solar Orbiter and ground campaigns such as the Total Solar Eclipse expeditions.

Scientific objectives and findings

Objectives target fundamental problems: the mechanism of coronal heating problem, origins of the solar wind, and acceleration processes of solar energetic particles. These goals connect to theoretical frameworks developed by researchers affiliated with MIT, Caltech, Harvard University, University of Chicago, Columbia University, Dartmouth College, Pennsylvania State University, University of California, San Diego, University of Colorado, and international teams from European Space Agency member institutions and Max Planck Society institutes.

Early findings included observations of switchbacks in the heliospheric magnetic field, insights into microphysical heating consistent with models from Parker, Eugene Parker Prize-related work, and particle signatures that informed models used at Los Alamos National Laboratory and Brookhaven National Laboratory. Results were compared with remote-sensing datasets from Solar Dynamics Observatory, Hinode, IRIS, and radio arrays like the Very Large Array and Murchison Widefield Array.

Operations and mission timeline

Operations were conducted by the Johns Hopkins University Applied Physics Laboratory with science planning coordinated through NASA Goddard Space Flight Center and instrument teams across universities including University of California, Berkeley, Princeton University, Stanford University, University of Colorado Boulder, and University of Michigan. The mission timeline includes launch, successive Venus gravity assists, progressively closer perihelia, and an extended mission phase engaging with collaborative campaigns such as those run by International Living With a Star and the Solar and Heliospheric Observatory community.

Critical mission milestones mirrored planning frameworks used in Mars Science Laboratory and New Horizons, with operations requiring autonomous fault protection strategies similar to those on Cassini and Juno. Data downlink utilized networks at NASA Deep Space Network complexes in Goldstone, Madrid, and Canberra.

Mission legacy and impact

The probe reshaped understanding in heliophysics, influencing instrument designs for future missions from agencies like European Space Agency, JAXA, Indian Space Research Organisation, and research centers including Max Planck Institute for Solar System Research and Southwest Research Institute. Scientific legacy intersects with advances at national laboratories such as Sandia National Laboratories and theoretical programs at Princeton Plasma Physics Laboratory. The mission informed space weather forecasting efforts used by NOAA's Space Weather Prediction Center and operational centers supporting Aerospace Corporation and commercial satellite operators.

Its technological innovations in thermal protection, autonomy, and in situ instrumentation set precedents for future inner heliosphere missions and cross-disciplinary projects undertaken by universities and international consortia, building on partnerships exemplified by collaborative efforts with NASA Goddard Space Flight Center, Jet Propulsion Laboratory, and research universities across the United States and Europe.

Category:NASA spacecraft Category:Solar physics missions