Frances Bagenal | |
|---|---|
 Bagenal in 2019 | |
| Born | 4 November 1954 Dorchester, Dorset, England |
| Alma mater | Lancaster University, Massachusetts Institute of Technology |
| Known for | Work on NASA planetary exploration missions as a plasma scientist |
| Scientific career | |
| Fields | Planetary science |
| Institutions | NASA |
Frances "Fran" Bagenal (born 1954) is a Professor of Astrophysical and Planetary Sciences at the University of Colorado Boulder and a researcher in the fields of space plasmas and planetary magnetospheres.
Bagenal has worked on a number of planetary science missions including the Voyager Plasma Science (PLS) experiment, Galileo , Deep Space 1, New Horizons mission to Pluto, and the Juno mission to Jupiter. [1] Usually in her work on different missions, she is a member of the science team as a plasma scientist. [2] Bagenal chaired NASA's Outer Planet Assessment Group that provides input from the scientific community on exploration of the outer Solar System. [3] She appeared in The Farthest , a 2017 documentary on the Voyager program, and in multiple television documentaries including the NOVA 2019 miniseries The Planets. [4]
In astronomy and planetary science, a magnetosphere is a region of space surrounding an astronomical object in which charged particles are affected by that object's magnetic field. It is created by a star or planet with an active interior dynamo.
Voyager 1 is a space probe launched by NASA on September 5, 1977, as part of the Voyager program to study the outer Solar System and interstellar space beyond the Sun's heliosphere. Launched 16 days after its twin, Voyager 2, Voyager 1 has operated for 43 years, 9 months and 24 days as of June 30, 2021 UTC [refresh] and still communicates with the Deep Space Network to receive routine commands and to transmit data to Earth. Real-time distance and velocity data is provided by NASA and JPL. At a distance of 152.2 AU from Earth as of May 31, 2021, it is the most distant man-made object from Earth.
Voyager 2 is a space probe launched by NASA on August 20, 1977, to study the outer planets and interstellar space beyond the Sun's heliosphere. A part of the Voyager program, it was launched 16 days before its twin, Voyager 1, on a trajectory that took longer to reach Jupiter and Saturn but enabled further encounters with Uranus and Neptune. It is the only spacecraft to have visited either of these two ice giant planets. Voyager 2 was the fourth of five spacecraft to achieve the Solar escape velocity, which allowed it to leave the Solar System.
Ganymede, a satellite of Jupiter, is the largest and most massive of the Solar System's moons. The ninth-largest object in the Solar System, it is the largest without a substantial atmosphere. It has a diameter of 5,268 km (3,273 mi), making it 26% larger than the planet Mercury by volume, although it is only 45% as massive. Possessing a metallic core, it has the lowest moment of inertia factor of any solid body in the Solar System and is the only moon known to have a magnetic field. Outward from Jupiter, it is the seventh satellite and the third of the Galilean moons, the first group of objects discovered orbiting another planet. Ganymede orbits Jupiter in roughly seven days and is in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.
Io, or Jupiter I, is the innermost and third-largest of the four Galilean moons of the planet Jupiter. Slightly larger than the Moon, Io is the fourth-largest moon in the Solar System, has the highest density of all of them, and has the lowest amount of water of any known astronomical object in the Solar System. It was discovered in 1610 by Galileo Galilei and was named after the mythological character Io, a priestess of Hera who became one of Zeus's lovers.
Sol Alan Stern is an American engineer and planetary scientist. He is the principal investigator of the New Horizons mission to Pluto and the Chief Scientist at Moon Express.
The magnetosphere of Jupiter is the cavity created in the solar wind by the planet's magnetic field. Extending up to seven million kilometers in the Sun's direction and almost to the orbit of Saturn in the opposite direction, Jupiter's magnetosphere is the largest and most powerful of any planetary magnetosphere in the Solar System, and by volume the largest known continuous structure in the Solar System after the heliosphere. Wider and flatter than the Earth's magnetosphere, Jupiter's is stronger by an order of magnitude, while its magnetic moment is roughly 18,000 times larger. The existence of Jupiter's magnetic field was first inferred from observations of radio emissions at the end of the 1950s and was directly observed by the Pioneer 10 spacecraft in 1973.
The exploration of Jupiter has been conducted via close observations by automated spacecraft. It began with the arrival of Pioneer 10 into the Jovian system in 1973, and, as of 2016, has continued with eight further spacecraft missions. All of these missions were undertaken by the National Aeronautics and Space Administration (NASA), and all but two were flybys taking detailed observations without landing or entering orbit. These probes make Jupiter the most visited of the Solar System's outer planets as all missions to the outer Solar System have used Jupiter flybys. On 5 July 2016, spacecraft Juno arrived and entered the planet's orbit—the second craft ever to do so. Sending a craft to Jupiter is difficult, mostly due to large fuel requirements and the effects of the planet's harsh radiation environment.
Neptune has been directly explored by only one space probe, Voyager 2, in 1989. As of June 2021, there are no approved future missions to visit the Neptunian system. NASA, ESA, and independent academic groups have proposed future scientific missions to visit Neptune. Some mission plans are still active, while others have been abandoned or put on hold.
Energetic neutral atom (ENA) imaging, often described as "seeing with atoms", is a technology used to create global images of otherwise invisible phenomena in the magnetospheres of planets and throughout the heliosphere, even to its outer boundary. This constitutes the far-flung edge of the solar system.
Reta F. Beebe is an American astronomer, author, and popularizer of astronomy. She is an expert on the planets Jupiter and Saturn, and the author of Jupiter: The Giant Planet. She is a professor emeritus in the Astronomy Department at New Mexico State University and 2010 winner of the NASA Exceptional Public Service medal.
Eberhard Grün is a German planetary scientist specialized in cosmic dust research. He is an active emeritus at the Max Planck Institute for Nuclear Physics , Heidelberg (Germany), research associate at the Laboratory for Atmospheric and Space Physics (LASP) in Boulder (Colorado), and was a Professor at the University of Heidelberg until his retirement in 2007. Eberhard Grün has a leading role in international cosmic dust science since over 30 years.
Margaret Galland Kivelson is an American space physicist, planetary scientist, and Distinguished Professor Emerita of Space Physics at the University of California, Los Angeles. From 2010 to the present, concurrent with her appointment at UCLA, Kivelson has been a research scientist and scholar at the University of Michigan. Her primary research interests include the magnetospheres of Earth, Jupiter, and Saturn. Recent research has also focused on Jupiter's Galilean moons. She was the Principal Investigator for the magnetometer on the Galileo Orbiter that acquired data in Jupiter's magnetosphere for eight years and a Co-Investigator on the FGM (magnetometer) of the earth-orbiting NASA-ESA Cluster mission. She is actively involved as a Co-Investigator on NASA's Themis mission, as a member of the Cassini magnetometer team, and as a participant in the magnetometer team for the European JUICE mission to Jupiter. Kivelson has published over 350 research papers and is co-editor of a widely used textbook on space physics.
Europa Clipper is an interplanetary mission in development by NASA comprising an orbiter. Set for a launch in October 2024, the spacecraft is being developed to study the Galilean moon Europa through a series of flybys while in orbit around Jupiter.
Andrew Perry Ingersoll is a professor of planetary science at the California Institute of Technology. Ingersoll was elected to the American Academy of Arts and Sciences in 1997. He received the lifetime achievement award in planetary science, the Gerard P. Kuiper Prize, in 2007. He proposed the runaway greenhouse effect and is known for his research on planetary atmospheres and climate.
Magnetometer (MAG) is an instrument suite on the Juno orbiter for planet Jupiter. The MAG instrument includes both the Fluxgate Magnetometer (FGM) and Advanced Stellar Compass (ASC) instruments. There two sets of MAG instrument suites, and they are both positioned on the far end of three solar panel array booms. Each MAG instrument suite observes the same swath of Jupiter, and by having two sets of instruments, determining what signal is from the planet and what is from spacecraft is supported. Avoiding signals from the spacecraft is another reason MAG is placed at the end of the solar panel boom, about 10 m and 12 m away from the central body of the Juno spacecraft.
Henry B. Throop, is an American astronomer and planetary scientist who specializes in the dynamics of rings and dust in the outer solar system. Throop is a member of the science team for NASA's New Horizons mission to Pluto and the Kuiper Belt, and has been involved with NASA missions throughout the solar system. Throop lives in Washington, DC where he runs NASA's science programs in the outer solar system. He has done extensive education and outreach around the world, having spent nearly a decade as an astronomer living in South Africa, India, and Mexico. The asteroid 193736 Henrythroop is named after him.
Emma J. Bunce is a British space physicist and Professor of Planetary Plasma Physics at the University of Leicester. She holds a Royal Society Wolfson Research Merit Award. Her research is on the magnetospheres of Saturn and Jupiter. She is principal investigator (PI) of the MIXS instrument on BepiColombo, was deputy lead on the Jupiter Icy Moons Explorer proposal, and co-investigator on the Cassini–Huygens mission.
Plasma Wave Subsystem, abbreviated PWS, is an instrument that is on board the Voyager 1 and Voyager 2 unmanned probes of the Voyager program. The device is 16 channel step frequency receiver and a low-frequency waveform receiver that can measure electron density. The PWS uses the two long antenna in a V-shape on the spacecraft, which are also used by another instrument on the spacecraft. The instrument recorded data about the Solar System's gas giants, and about the outer reaches of the Heliosphere, and beyond. In the 2010s the PWS was used to play the "sounds of interstellar space" as the spacecraft can sample the local interstellar medium after they departed the Sun's heliosphere. The heliosphere is a region essentially under the influence of the Sun's solar wind, rather than the local interstellar environment, and is another way of understanding the Solar System in comparison to the objects gravitationally bound around Earth's Sun.
Melissa McGrath is an astronomer whose expertise is the atmosphere and magnetosphere of our Solar System planets and their moon. Her main interest has focused on imaging and spectroscopic studies of Jupiter’s Galilean moons. She is currently co-investigator on the ultraviolet spectrometer instrument on ESA JUICE mission to Ganymede, and co-investigator on two proposed instruments on the NASA Europa Clipper mission. McGrath is senior scientist at SETI Institute in Mountain View, California.
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