Solar physics

Solar physics
Robert A. Rohde · CC BY-SA 3.0 · source
Name	Solar physics
Caption	Solar corona observed by SOHO during a solar eclipse
Field	Astrophysics
Notable instruments	SOHO, SDO, Parker Solar Probe, Hinode (satellite), IRIS (satellite)
Notable people	George Ellery Hale, Eugene Parker, Antony Hewish, Carl-Gustaf Rossby

Solar physics Solar physics is the study of the Sun as a star, its interior, atmosphere, magnetic activity, and influence on the Solar System. Research in this field connects observations from missions like SOHO, SDO, and Parker Solar Probe with theory developed by figures such as Eugene Parker and George Ellery Hale. It underpins applied concerns involving NOAA space weather forecasting and technological impacts studied by agencies like NASA and ESA.

Overview

The discipline integrates data from observatories such as Mount Wilson Observatory, Mauna Loa Solar Observatory, and Big Bear Solar Observatory with theory from institutions like Harvard–Smithsonian Center for Astrophysics and Max Planck Institute for Solar System Research. Key historical milestones include the discovery of sunspots by observers at Royal Greenwich Observatory, magnetic field measurements by George Ellery Hale linked to the development of magnetographs at Yerkes Observatory, and the formulation of the solar wind by Eugene Parker, later tested by Mariner 2 and Ulysses (spacecraft). Contemporary collaborations involve NOAA, JAXA, and CNSA programs coordinating platforms such as Hinode (satellite) and ground networks like Global Oscillation Network Group.

Solar Interior and Energy Generation

Studies of the solar interior rely on helioseismology from instruments aboard SOHO and networks like GONG to probe acoustic modes described in theories by Andrei Zharkov and Douglas Gough. Energy generation occurs via the proton–proton chain as predicted by work at Cavendish Laboratory and calculations by Hans Bethe; neutrino fluxes were measured by detectors including Homestake Experiment, Super-Kamiokande, and SNO. Models such as the Standard Solar Model were refined at centers like Princeton University and informed by opacities from Lawrence Livermore National Laboratory and equation-of-state research linked to Los Alamos National Laboratory.

Solar Atmosphere and Structure (Photosphere, Chromosphere, Corona)

Observations of the photosphere employ telescopes at Kitt Peak National Observatory and techniques developed by researchers at University of Chicago; spectral work often references atlases curated by National Solar Observatory. Chromospheric phenomena were cataloged in campaigns associated with Mount Wilson Observatory and theoretical descriptions advanced by scholars from University of Cambridge. Corona studies, including heating puzzles explored through theories by Eugene Parker and instrumentation on SOHO and TRACE (spacecraft), draw on measurements from coronagraphs developed at High Altitude Observatory and eclipse expeditions linked to Royal Astronomical Society events.

Solar Magnetic Activity and Sunspots

Sunspot observations trace to archives at Royal Greenwich Observatory and analyses by Richard Carrington; magnetic cycle theory evolved with contributions from L. J. S. Parker family of dynamo concepts developed at University of Chicago and Imperial College London. Flare research grew from studies at Culham Centre for Fusion Energy and observational campaigns using RHESSI and GOES (satellite), while prominences and filament dynamics were investigated in programs at Observatoire de Paris and Instituto de Astrofísica de Canarias.

Solar Wind, Heliosphere, and Space Weather

The solar wind concept by Eugene Parker was validated by missions such as Mariner 2, Ulysses (spacecraft), and Voyager 2 with plasma instrumentation developed at Jet Propulsion Laboratory. The heliospheric magnetic field and interplanetary shocks have been tracked by teams at Arecibo Observatory and National Aeronautics and Space Administration centers, informing space weather forecasts operated by NOAA and mitigation planning with inputs from European Space Agency. Geomagnetic storm studies link to records at Greenwich Royal Observatory and modern monitoring by SuperMAG and American Geophysical Union conferences.

Observation Techniques and Instrumentation

Instrumentation ranges from ground-based arrays like ALMA configured for solar work and optical systems at Daniel K. Inouye Solar Telescope to spaceborne platforms such as SDO, SOHO, Hinode (satellite), and Parker Solar Probe. Spectroscopy heritage includes equipment from CERN-affiliated laboratories for detector technology and photon-counting advancements by groups at Stanford University. Coronagraphs designed by teams at High Altitude Observatory and magnetographs pioneered at Yerkes Observatory enable measurement of magnetic topology used by modelers at Princeton Plasma Physics Laboratory.

Theoretical Models and Numerical Simulations

Theoretical frameworks include magnetohydrodynamics developed in academic programs at MIT and numerical codes implemented by groups at University of Colorado Boulder and Max Planck Institute for Solar System Research. Global dynamo simulations draw on computing resources from National Center for Atmospheric Research and supercomputing centers at Lawrence Berkeley National Laboratory. Data-assimilation efforts link observational teams at Harvard–Smithsonian Center for Astrophysics with modelers contributing to community tools like those discussed at American Astronomical Society meetings, and analytical work references foundations laid by Subrahmanyan Chandrasekhar and Stefan-Boltzmann formulations.

Category:Astrophysics