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, 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.
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.
Solar physics is the branch of astrophysics that specializes in the study of the Sun. It intersects with many disciplines of pure physics and astrophysics.
The heliospheric current sheet, or interplanetary current sheet, is a surface separating regions of the heliosphere where the interplanetary magnetic field points toward and away from the Sun. A small electrical current with a current density of about 10−10 A/m2 flows within this surface, forming a current sheet confined to this surface. The shape of the current sheet results from the influence of the Sun's rotating magnetic field on the plasma in the interplanetary medium. The thickness of the current sheet is about 10,000 km (6,200 mi) near the orbit of the Earth.
Katlenburg-Lindau is a municipality in the Landkreis (district) of Northeim in Lower Saxony, Germany. It is situated approximately 10 km southeast of Northeim, and 20 km northeast of Göttingen. Katlenburg-Lindau was formed on 1 March 1974 from the formerly independent communities of Katlenburg-Duhm, Gillersheim, Berka, Elvershausen, Wachenhausen, Suterode and Lindau. With the exception of Lindau, which had belonged Landkreis Duderstadt, these communities were part of Landkreis Northeim. The Max Planck Institute for Solar System Research of the Max Planck Society was located in Lindau from 1946 to 2014, when it was moved to Göttingen. Until June 2004 the MPI was known as "Max-Planck-Institut für Aeronomie".
Space physics, also known as space plasma physics, is the study of naturally occurring plasmas within Earth's upper atmosphere and the rest of the Solar System. It includes the topics of aeronomy, aurorae, planetary ionospheres and magnetospheres, radiation belts, and space weather. It also encompasses the discipline of heliophysics, which studies the solar physics of the Sun, its solar wind, the coronal heating problem, solar energetic particles, and the heliosphere.
The Max Planck Institute for Solar System Research is a research institute in astronomy and astrophysics located in Göttingen, Germany, where it relocated in February 2014 from the nearby village of Lindau. The exploration of the Solar System is the central theme for research done at this institute.
Heliophysics is the physics of the Sun and its connection with the Solar System. NASA defines heliophysics as "(1) the comprehensive new term for the science of the Sun - Solar System Connection, (2) the exploration, discovery, and understanding of Earth's space environment, and (3) the system science that unites all of the linked phenomena in the region of the cosmos influenced by a star like our Sun."
Lindau is a village in the southern Lower Saxon section of the Eichsfeld, Germany. Lindau belongs to the Gemeinde (municipality) of Katlenburg-Lindau and to the Landkreis (district) of Northeim. The village is known to many space physicists and radio engineers around the world, as the Max Planck Institute for Solar System Research was based there until 2014, when it moved to Göttingen, also in Lower Saxony.
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.
Liu Chen is an American theoretical physicist who has made original contributions to many aspects of plasma physics. He is known for the discoveries of kinetic Alfven waves, toroidal Alfven eigenmodes, and energetic particle modes; the theories of geomagnetic pulsations, Alfven wave heating, and fishbone oscillations, and the first formulation of nonlinear gyrokinetic equations. Chen retired from University of California, Irvine (UCI) in 2012, assuming the title professor emeritus of physics and astronomy.
Sir William Ian Axford was a New Zealand space scientist who was director of Germany's Max Planck Institute for Aeronomy from 1974 to 1990. Axford's research was focused on the interaction of the Sun with the magnetic field of Earth (magnetosphere) or the interstellar medium (heliosphere).
Magnetohydrodynamic turbulence concerns the chaotic regimes of magnetofluid flow at high Reynolds number. Magnetohydrodynamics (MHD) deals with what is a quasi-neutral fluid with very high conductivity. The fluid approximation implies that the focus is on macro length-and-time scales which are much larger than the collision length and collision time respectively.
The Arctowski Medal is awarded by the U.S. National Academy of Sciences "for studies in solar physics and solar-terrestrial relationships." Named in honor of Henryk Arctowski, it was first awarded in 1969.
The Heliophysics Science Division of the Goddard Space Flight Center (NASA) conducts research on the Sun, its extended Solar System environment, and interactions of Earth, other planets, small bodies, and interstellar gas with the heliosphere. Division research also encompasses geospace—Earth's uppermost atmosphere, the ionosphere, and the magnetosphere—and the changing environmental conditions throughout the coupled heliosphere.
David John McComas is an American space physicist, Vice President for Princeton Plasma Physics Laboratory, and Professor of Astrophysical Sciences and leads the Space Physics at Princeton Group at Princeton University. He had been Assistant Vice President for Space Science and Engineering at the Southwest Research Institute, Adjoint Professor of Physics at the University of Texas at San Antonio (UTSA), and was the founding director of the Center for Space Science and Exploration at Los Alamos National Laboratory. He is noted for his extensive accomplishments in experimental space plasma physics, including leading instruments and missions to study the heliosphere and solar wind: IMAP, IBEX, TWINS, Ulysses/SWOOPS, ACE/SWEPAM, and Parker Solar Probe. He received the National Academy of Science's 2023 Arctowski Medal, European Geosciences Union 2022 Hannes Alfven Medal, SCOSTEP 2022 Distinguished Scientist Award, a NASA Exceptional Public Service Medal in 2015, the 2014 COSPAR Space Science Award, and the American Geophysical Union 1993 Macelwane Medal.
Space climate is the long-term variation in solar activity within the heliosphere, including the solar wind, the Interplanetary magnetic field (IMF), and their effects in the near-Earth environment, including the magnetosphere of Earth and the ionosphere, the upper and lower atmosphere, climate, and other related systems. The scientific study of space climate is an interdisciplinary field of space physics, solar physics, heliophysics, and geophysics. It is thus conceptually related to terrestrial climatology, and its effects on the atmosphere of Earth are considered in climate science.
Janet G. Luhmann is an American physicist and senior fellow of the Space Sciences Laboratory of the University of California, Berkeley. She has made major contributions to a wide range of topics in planetary, solar, magnetospheric, and heliospheric physics. She is the principal investigator of the IMPACT instrument suite on the twin-spacecraft STEREO mission. IMPACT stands for In-situ Measurements of Particles and Coronal mass ejection (CME) Transients. It consists of a, "suite of seven instruments that samples the 3-D distribution of solar wind plasma electrons, the characteristics of the solar energetic particle (SEP) ions and electrons, and the local vector magnetic field."
Akira Hasegawa is a Japanese theoretical physicist and engineer who has worked in the U.S. and Japan. He is known for his work in the derivation of the Hasegawa–Mima equation, which describes fundamental plasma turbulence and the consequent generation of zonal flow that controls plasma diffusion. Hasegawa also made the discovery of optical solitons in glass fibers, a concept that is essential for high speed optical communications.
Petr Heinzel is a Czech astronomer and professor who is specialized in Solar Physics. From 2004 to 2012 he was director of the Astronomical Institute of the Czech Academy of Sciences. In 2012 he was appointed Professor of Astronomy and Astrophysics at Charles University, Czech Republic. Since, 2017, he is chair of the Czech Astronomical Society. He is also a member of the International Astronomical Union.
