Eric Priest | |
---|---|
Born | Eric Ronald Priest 7 November 1943 |
Alma mater | University of Leeds |
Scientific career | |
Thesis | Magnetohydrodynamic neutral point theory (1970) |
Doctoral advisor | Thomas Cowling [1] |
Doctoral students | Philippa Browning [2] Alan Hood Moira Jardine [3] |
Website | risweb |
Eric Ronald Priest FRSE FRS (born 7 November 1943) is Emeritus Professor at St Andrews University, where he previously held the Gregory Chair of Mathematics and a Bishop Wardlaw Professorship.
Priest is a recognised authority in solar magnetohydrodynamics (or MHD for short), the study of the subtle, and often nonlinear, interaction between the Sun's magnetic field and its plasma interior or atmosphere, treated as a continuous medium. Priest is an applied mathematician and, along with the other members of his research group at St Andrews, is currently investigating a large number of solar phenomena, including sunspots, coronal heating, wave propagation, magnetic reconnection, magnetic instabilities, magnetic structures and helioseismology. This is done using mathematical modelling techniques and observational data from satellites such as SoHO, Yohkoh and TRACE, or ground-based observatories such as Kitt Peak and Big Bear. In 2000 he was the James Arthur Prize Lecturer at Harvard University. Professor Priest has received a number of academic awards for his research, including Hale Prize of the American Astronomical Society (2002), and was elected a Fellow of the Royal Society in the same year. He is notable in the solar physics community as something of an evangelist for the importance of magnetic reconnection in driving many solar phenomena, and as an explanation of the solar coronal heating problem [ citation needed ].
As an applied mathematician, his research interests involve constructing mathematical models for the subtle and complex ways in which magnetic fields interact with plasmas in the atmosphere of the Sun and in more exotic cosmic objects. In particular, he is trying to understand how the corona of the Sun is heated to several million degrees and how magnetic energy is converted into other forms in solar flares.
In the area of science and religion, he considers himself aware of the importance of trying in small ways to encourage dialogue and understanding between Islam and Christianity and recently spoke on science and culture to 850 schoolchildren in Alexandria, Egypt. He has also preached in St Andrews on the tensions between Christianity and science and spoke on "Creativity in Science" at a conference on Creativity and the Imagination. He is active in the local Anglican church and enjoys hill-walking, bridge, singing in a couple of choirs and spending time with his wife Clare and four children. [4]
Priest retired from full-time teaching in 2010, and was awarded a two-year Leverhulme Emeritus Fellowship in 2011. He retains a link with St Andrews as Emeritus Professor in the School of Mathematics and Statistics and remains active in research.[ citation needed ]
In 2020, Priest received from the European Physical Society the prestigious ESPD Senior Prize for "long-standing leadership via mentoring, supervising and field-defining textbooks and for fundamental contributions in key topics of solar magnetohydrodynamics, particularly magnetic reconnection in the solar atmosphere and solar coronal heating." [5]
A corona is the outermost layer of a star's atmosphere. It consists of plasma.
The solar wind is a stream of charged particles released from the upper atmosphere of the Sun, called the corona. This plasma mostly consists of electrons, protons and alpha particles with kinetic energy between 0.5 and 10 keV. The composition of the solar wind plasma also includes a mixture of materials found in the solar plasma: trace amounts of heavy ions and atomic nuclei of elements such as C, N, O, Ne, Mg, Si, S, and Fe. There are also rarer traces of some other nuclei and isotopes such as P, Ti, Cr, 54Fe and 56Fe, and 58Ni, 60Ni, and 62Ni. Superimposed with the solar-wind plasma is the interplanetary magnetic field. The solar wind varies in density, temperature and speed over time and over solar latitude and longitude. Its particles can escape the Sun's gravity because of their high energy resulting from the high temperature of the corona, which in turn is a result of the coronal magnetic field. The boundary separating the corona from the solar wind is called the Alfvén surface.
Magnetohydrodynamics is a model of electrically conducting fluids that treats all interpenetrating particle species together as a single continuous medium. It is primarily concerned with the low-frequency, large-scale, magnetic behavior in plasmas and liquid metals and has applications in numerous fields including geophysics, astrophysics, and engineering.
Hannes Olof Gösta Alfvén was a Swedish electrical engineer, plasma physicist and winner of the 1970 Nobel Prize in Physics for his work on magnetohydrodynamics (MHD). He described the class of MHD waves now known as Alfvén waves. He was originally trained as an electrical power engineer and later moved to research and teaching in the fields of plasma physics and electrical engineering. Alfvén made many contributions to plasma physics, including theories describing the behavior of aurorae, the Van Allen radiation belts, the effect of magnetic storms on the Earth's magnetic field, the terrestrial magnetosphere, and the dynamics of plasmas in the Milky Way galaxy.
A coronal mass ejection (CME) is a significant ejection of magnetic field and accompanying plasma mass from the Sun's corona into the heliosphere. CMEs are often associated with solar flares and other forms of solar activity, but a broadly accepted theoretical understanding of these relationships has not been established.
In plasma physics, an Alfvén wave, named after Hannes Alfvén, is a type of plasma wave in which ions oscillate in response to a restoring force provided by an effective tension on the magnetic field lines.
Magnetic reconnection is a physical process occurring in electrically conducting plasmas, in which the magnetic topology is rearranged and magnetic energy is converted to kinetic energy, thermal energy, and particle acceleration. Magnetic reconnection involves plasma flows at a substantial fraction of the Alfvén wave speed, which is the fundamental speed for mechanical information flow in a magnetized plasma.
The interplanetary medium (IPM) or interplanetary space consists of the mass and energy which fills the Solar System, and through which all the larger Solar System bodies, such as planets, dwarf planets, asteroids, and comets, move. The IPM stops at the heliopause, outside of which the interstellar medium begins. Before 1950, interplanetary space was widely considered to either be an empty vacuum, or consisting of "aether".
Eugene Newman Parker was an American solar and plasma physicist. In the 1950s he proposed the existence of the solar wind and that the magnetic field in the outer Solar System would be in the shape of a Parker spiral, predictions that were later confirmed by spacecraft measurements. In 1987, Parker proposed the existence of nanoflares, a leading candidate to explain the coronal heating problem.
In magnetohydrodynamics (MHD), shocks and discontinuities are transition layers where properties of a plasma change from one equilibrium state to another. The relation between the plasma properties on both sides of a shock or a discontinuity can be obtained from the conservative form of the MHD equations, assuming conservation of mass, momentum, energy and of .
Coronal seismology is a technique of studying the plasma of the Sun's corona with the use of magnetohydrodynamic (MHD) waves and oscillations. Magnetohydrodynamics studies the dynamics of electrically conducting fluids - in this case the fluid is the coronal plasma. Observed properties of the waves (e.g. period, wavelength, amplitude, temporal and spatial signatures, characteristic scenarios of the wave evolution, combined with a theoretical modelling of the wave phenomena, may reflect physical parameters of the corona which are not accessible in situ, such as the coronal magnetic field strength and Alfvén velocity and coronal dissipative coefficients. Originally, the method of MHD coronal seismology was suggested by Y. Uchida in 1970 for propagating waves, and B. Roberts et al. in 1984 for standing waves, but was not practically applied until the late 90s due to a lack of necessary observational resolution. Philosophically, coronal seismology is similar to the Earth's seismology, helioseismology, and MHD spectroscopy of laboratory plasma devices. In all these approaches, waves of various kind are used to probe a medium.
Adolfo Figueroa-Viñas is the first Puerto Rican astrophysicist at the National Aeronautics and Space Administration (NASA) and is an expert in solar and space plasma physics at the Heliophysics Science Division. As a staff scientist his research interests include studying plasma kinetic physics and magnetohydrodynamics of the solar wind, heliosphere, shock waves, MHD and kinetic simulation of plasma instabilities, and turbulent processes associated with space, solar and astrophysical plasmas.
A nanoflare is a very small episodic heating event which happens in the corona, the external atmosphere of the Sun.
Jiong Qiu (邱炯) is a Chinese-born American astrophysicist who won the Karen Harvey Prize for her work in solar flares.
Andrew Michael Soward is a British fluid dynamicist. He is an emeritus professor at the Department of Mathematics of the University of Exeter.
Moira Mary Jardine is a British astrophysicist with an interest in young stars, particularly the structure of their magnetic fields and coronae, and the mechanisms by which they interact with their disks and planets. She was promoted to a Personal Chair in 2012, making her the first female professor of Physics at the University of St Andrews.
Philippa K. Browning is a Professor of Astrophysics in the Jodrell Bank Centre for Astrophysics at the University of Manchester. She specialises in the mathematical modelling of fusion plasmas.
Clare Elizabeth Parnell is a British astrophysicist and applied mathematician who studies the mathematics of the sun and of magnetic fields, including the Solar corona and the sun's magnetic carpet, magnetic reconnection in plasma, and the null points of magnetic fields. She is a professor of mathematics at the University of St Andrews, and the former head of the Division of Applied Mathematics at St Andrews.
William Henry Matthaeus is an American astrophysicist and plasma physicist. He is known for his research on turbulence in magnetohydrodynamics (MHD) and astrophysical plasmas, for which he was awarded the 2019 James Clerk Maxwell Prize for Plasma Physics.
James Wynne "Jim" Dungey (1923–2015) was a British space scientist who was pivotal in establishing the field of space weather and made significant contributions to the fundamental understanding of plasma physics.