Imperial College London

Emeritus ProfessorStevenSchwartz

Faculty of Natural SciencesDepartment of Physics

Distinguished Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 7660s.schwartz Website

 
 
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Location

 

6M58Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

253 results found

Schwartz SJ, Ergun R, Kucharek H, Wilson L, Chen L-J, Goodrich K, Turner D, Gingell I, Madanian H, Gershman D, Strangeway Ret al., 2021, Evaluating the deHoffmann-Teller Cross-Shock Potential at Real Collisionless Shocks, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 126, ISSN: 2169-9380

Journal article

Shuster JR, Gershman DJ, Dorelli JC, Giles BL, Wang S, Bessho N, Chen L-J, Cassak PA, Schwartz SJ, Denton RE, Uritsky VM, Paterson WR, Schiff C, Vinas AF, Ng J, Avanov LA, da Silva DE, Torbert RBet al., 2021, Structures in the terms of the Vlasov equation observed at Earth's magnetopause, NATURE PHYSICS, ISSN: 1745-2473

Journal article

Madanian H, Schwartz SJ, Fuselier SA, Burgess D, Turner DL, Chen L-J, Desai MI, Starkey MJet al., 2021, Direct Evidence for Magnetic Reflection of Heavy Ions from High Mach Number Collisionless Shocks, ASTROPHYSICAL JOURNAL LETTERS, Vol: 915, ISSN: 2041-8205

Journal article

Johlander A, Battarbee M, Vaivads A, Turc L, Pfau-Kempf Y, Ganse U, Grandin M, Dubart M, Khotyaintsev YV, Caprioli D, Haggerty C, Schwartz SJ, Giles BL, Palmroth Met al., 2021, Ion Acceleration Efficiency at the Earth's Bow Shock: Observations and Simulation Results, ASTROPHYSICAL JOURNAL, Vol: 914, ISSN: 0004-637X

Journal article

Starkey MJ, Fuselier SA, Desai MI, Schwartz SJ, Russell CT, Wei H, Madanian H, Mukherjee J, Wilson LBet al., 2021, MMS Observations of Energized He+ Pickup Ions at Quasiperpendicular Shocks, ASTROPHYSICAL JOURNAL, Vol: 913, ISSN: 0004-637X

Journal article

Hoilijoki S, Pucci F, Ergun RE, Schwartz SJ, Wilder FD, Eriksson S, Chasapis A, Ahmadi N, Webster JM, Burch JL, Torbert RB, Strangeway RJ, Giles BLet al., 2021, Origin of Electron-Scale Magnetic Fluctuations Close to an Electron Diffusion Region, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 126, ISSN: 2169-9380

Journal article

Turner DL, Wilson LB, Goodrich KA, Madanian H, Schwartz SJ, Liu TZ, Johlander A, Caprioli D, Cohen IJ, Gershman D, Hietala H, Westlake JH, Lavraud B, Le Contel O, Burch JLet al., 2021, Direct multipoint observations capturing the reformation of a supercritical fast magnetosonic shock, The Astrophysical Journal Letters, Vol: 911, Pages: 1-11, ISSN: 2041-8205

Using multipoint Magnetospheric Multiscale (MMS) observations in an unusual string-of-pearls configuration, we examine in detail observations of the reformation of a fast magnetosonic shock observed on the upstream edge of a foreshock transient structure upstream of Earth's bow shock. The four MMS spacecraft were separated by several hundred kilometers, comparable to suprathermal ion gyroradius scales or several ion inertial lengths. At least half of the shock reformation cycle was observed, with a new shock ramp rising up out of the "foot" region of the original shock ramp. Using the multipoint observations, we convert the observed time-series data into distance along the shock normal in the shock's rest frame. That conversion allows for a unique study of the relative spatial scales of the shock's various features, including the shock's growth rate, and how they evolve during the reformation cycle. Analysis indicates that the growth rate increases during reformation, electron-scale physics play an important role in the shock reformation, and energy conversion processes also undergo the same cyclical periodicity as reformation. Strong, thin electron-kinetic-scale current sheets and large-amplitude electrostatic and electromagnetic waves are reported. Results highlight the critical cross-scale coupling between electron-kinetic- and ion-kinetic-scale processes and details of the nature of nonstationarity, shock-front reformation at collisionless, fast magnetosonic shocks.

Journal article

Horaites K, Andersson L, Schwartz SJ, Xu S, Mitchell DL, Mazelle C, Halekas J, Gruesbeck Jet al., 2021, Observations of Energized Electrons in the Martian Magnetosheath, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 126, ISSN: 2169-9380

Journal article

Xu S, Schwartz SJ, Mitchell DL, Horaites K, Andersson L, Halekas J, Mazelle C, Gruesbeck JRet al., 2021, Cross-Shock Electrostatic Potentials at Mars Inferred From MAVEN Measurements, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 126, ISSN: 2169-9380

Journal article

Schwartz SJ, Kucharek H, Farrugia CJ, Trattner K, Gingell I, Ergun RE, Strangeway R, Gershman Det al., 2021, Energy Conversion Within Current Sheets in the Earth's Quasi-Parallel Magnetosheath, GEOPHYSICAL RESEARCH LETTERS, Vol: 48, ISSN: 0094-8276

Journal article

Madanian H, Desai M, Schwartz SJ, Wilson LB, Fuselier SA, Burch JL, Le Contel O, Turner DL, Ogasawara K, Brosius AL, Russell CT, Ergun RE, Ahmadi N, Gershman DJ, Lindqvist P-Aet al., 2021, The Dynamics of a High Mach Number Quasi-perpendicular Shock: MMS Observations, ASTROPHYSICAL JOURNAL, Vol: 908, ISSN: 0004-637X

Journal article

Chandler MO, Schwartz SJ, Avanov LA, Coffey VN, Giles BL, Moore TE, Pollock CJ, Burch JL, Russell CT, Torbert RBet al., 2021, Observations of Mirror Mode Structures in the Dawn-Side Magnetosphere, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 126, ISSN: 2169-9380

Journal article

Horbury TS, OBrien H, Carrasco Blazquez I, Bendyk M, Brown P, Hudson R, Evans V, Oddy TM, Carr CM, Beek TJ, Cupido E, Bhattacharya S, Dominguez J-A, Matthews L, Myklebust VR, Whiteside B, Bale SD, Baumjohann W, Burgess D, Carbone V, Cargill P, Eastwood J, Erdös G, Fletcher L, Forsyth R, Giacalone J, Glassmeier K-H, Goldstein ML, Hoeksema T, Lockwood M, Magnes W, Maksimovic M, Marsch E, Matthaeus WH, Murphy N, Nakariakov VM, Owen CJ, Owens M, Rodriguez-Pacheco J, Richter I, Riley P, Russell CT, Schwartz S, Vainio R, Velli M, Vennerstrom S, Walsh R, Wimmer-Schweingruber RF, Zank G, Müller D, Zouganelis I, Walsh APet al., 2020, The Solar Orbiter magnetometer, Astronomy & Astrophysics, Vol: 642, Pages: A9-A9, ISSN: 0004-6361

The magnetometer instrument on the Solar Orbiter mission is designed to measure the magnetic field local to the spacecraft continuously for the entire mission duration. The need to characterise not only the background magnetic field but also its variations on scales from far above to well below the proton gyroscale result in challenging requirements on stability, precision, and noise, as well as magnetic and operational limitations on both the spacecraft and other instruments. The challenging vibration and thermal environment has led to significant development of the mechanical sensor design. The overall instrument design, performance, data products, and operational strategy are described.

Journal article

Ergun RE, Ahmadi N, Kromyda L, Schwartz SJ, Chasapis A, Hoilijoki S, Wilder FD, Stawarz JE, Goodrich KA, Turner DL, Cohen IJ, Bingham ST, Holmes JC, Nakamura R, Pucci F, Torbert RB, Burch JL, Lindqvist P-A, Strangeway RJ, Le Contel O, Giles BLet al., 2020, Observations of Particle Acceleration in Magnetic Reconnection-driven Turbulence, ASTROPHYSICAL JOURNAL, Vol: 898, ISSN: 0004-637X

Journal article

Ergun RE, Ahmadi N, Kromyda L, Schwartz SJ, Chasapis A, Hoilijoki S, Wilder FD, Cassak PA, Stawarz JE, Goodrich KA, Turner DL, Pucci F, Pouquet A, Matthaeus WH, Drake JF, Hesse M, Shay MA, Torbert RB, Burch JLet al., 2020, Particle Acceleration in Strong Turbulence in the Earth's Magnetotail, ASTROPHYSICAL JOURNAL, Vol: 898, ISSN: 0004-637X

Journal article

Wilder FD, Schwartz SJ, Ergun RE, Eriksson S, Ahmadi N, Chasapis A, Newman DL, Burch JL, Torbert RB, Strangeway RJ, Giles BLet al., 2020, Parallel Electrostatic Waves Associated With Turbulent Plasma Mixing in the Kelvin-Helmholtz Instability, GEOPHYSICAL RESEARCH LETTERS, Vol: 47, ISSN: 0094-8276

Journal article

Starkey M, Fuselier SA, Desai MI, Schwartz SJ, Gomez RG, Mukherjee J, Cohen IJ, Russell CTet al., 2020, MMS Observations of Accelerated Interstellar Pickup He(+)Ions at an Interplanetary Shock, ASTROPHYSICAL JOURNAL, Vol: 897, ISSN: 0004-637X

Journal article

Madanian H, Schwartz SJ, Halekas JS, Wilson LBet al., 2020, Nonstationary Quasiperpendicular Shock and Ion Reflection at Mars, GEOPHYSICAL RESEARCH LETTERS, Vol: 47, ISSN: 0094-8276

Journal article

Wilson LB, Chen L-J, Wang S, Schwartz SJ, Turner DL, Stevens ML, Kasper JC, Osmane A, Caprioli D, Bale SD, Pulupa MP, Salem CS, Goodrich KAet al., 2020, Electron Energy Partition across Interplanetary Shocks. III. Analysis, ASTROPHYSICAL JOURNAL, Vol: 893, ISSN: 0004-637X

Journal article

Gingell I, Schwartz SJ, Eastwood JP, Stawarz JE, Burch JL, Ergun RE, Fuselier SA, Gershman DJ, Giles BL, Khotyaintsev YV, Lavraud B, Lindqvist P, Paterson WR, Phan TD, Russell CT, Strangeway RJ, Torbert RB, Wilder Fet al., 2020, Statistics of reconnecting current sheets in the transition region of earth's bow shock, Journal of Geophysical Research: Space Physics, Vol: 125, Pages: 1-14, ISSN: 2169-9380

We have conducted a comprehensive survey of burst mode observations of Earth's bow shock by the Magnetospheric Multiscale mission to identify and characterize current sheets associated with collisionless shocks, with a focus on those containing fast electron outflows, a likely signature of magnetic reconnection. The survey demonstrates that these thin current sheets are observed within the transition region of approximately 40% of shocks within the burst mode data set of Magnetospheric Multiscale. With only small apparent bias toward quasi‐parallel shock orientations and high Alfvén Mach numbers, the results suggest that reconnection at shocks is a universal process, occurring across all shock orientations and Mach numbers. On examining the distributions of current sheet properties, we find no correlation between distance from the shock, sheet width, or electron jet speed, though the relationship between electron and ion jet speed supports expectations of electron‐only reconnection in the region. Furthermore, we find that robust heating statistics are not separable from background fluctuations, and thus, the primary consequence of reconnection at shocks is in relaxing the topology of the disordered magnetic field in the transition region.

Journal article

Pucci F, Velli M, Shi C, Singh KAP, Tenerani A, Alladio F, Ambrosino F, Buratti P, Fox W, Jara-Almonte J, Ji H, Yamada M, Yoo J, Okamura S, Ergun R, Hoilijoki S, Schwartz Set al., 2020, Onset of fast magnetic reconnection and particle energization in laboratory and space plasmas, Journal of Plasma Physics, ISSN: 0022-3778

The onset of magnetic reconnection in space, astrophysical and laboratory plasmas is reviewed discussing results from theory, numerical simulations and observations. After a brief introduction on magnetic reconnection and approach to the question of onset, we first discuss recent theoretical models and numerical simulations, followed by observations of reconnection and its effects in space and astrophysical plasmas from satellites and ground-based detectors, as well as measurements of reconnection in laboratory plasma experiments. Mechanisms allowing reconnection spanning from collisional resistivity to kinetic effects as well as partial ionization are described, providing a description valid over a wide range of plasma parameters, and therefore applicable in principle to many different astrophysical and laboratory environments. Finally, we summarize the implications of reconnection onset physics for plasma dynamics throughout the Universe and illustrate how capturing the dynamics correctly is important to understanding particle acceleration. The goal of this review is to give a view on the present status of this topic and future interesting investigations, offering a unified approach.

Journal article

Hoilijoki S, Ergun RE, Schwartz SJ, Eriksson S, Wilder FD, Webster JM, Ahmadi N, Le Contel O, Burch JL, Torbert RB, Strangeway RJ, Giles BLet al., 2019, Electron-Scale Magnetic Structure Observed Adjacent to an Electron Diffusion Region at the Dayside Magnetopause, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 124, Pages: 10153-10169, ISSN: 2169-9380

Journal article

Ergun RE, Hoilijoki S, Ahmadi N, Schwartz SJ, Wilder FD, Burch JL, Torbert RB, Lindqvist P-A, Graham DB, Strangeway RJ, Le Contel O, Holmes JC, Stawarz JE, Goodrich KA, Eriksson S, Giles BL, Gershman D, Chen LJet al., 2019, Magnetic Reconnection in Three Dimensions: Observations of Electromagnetic Drift Waves in the Adjacent Current Sheet, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 124, Pages: 10104-10118, ISSN: 2169-9380

Journal article

Ergun RE, Hoilijoki S, Ahmadi N, Schwartz SJ, Wilder FD, Drake JF, Hesse M, Shay MA, Ji H, Yamada M, Graham DB, Cassak PA, Swisdak M, Burch JL, Torbert RB, Holmes JC, Stawarz JE, Goodrich KA, Eriksson S, Strangeway RJ, LeContel Oet al., 2019, Magnetic Reconnection in Three Dimensions: Modeling and Analysis of Electromagnetic Drift Waves in the Adjacent Current Sheet, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 124, Pages: 10085-10103, ISSN: 2169-9380

Journal article

Wilson LB, Chen L-J, Wang S, Schwartz SJ, Turner DL, Stevens ML, Kasper JC, Osmane A, Caprioli D, Bale SD, Pulupa MP, Salem CS, Goodrich KAet al., 2019, Electron Energy Partition across Interplanetary Shocks. II. Statistics, ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, Vol: 245, ISSN: 0067-0049

Journal article

Schwartz SJ, Andersson L, Xu S, Mitchell DL, Akbari H, Ergun RE, Mazelle C, Thaller SA, Sales ARN, Horaites K, DiBraccio GA, Meziane Ket al., 2019, Collisionless Electron Dynamics in the Magnetosheath of Mars, GEOPHYSICAL RESEARCH LETTERS, Vol: 46, Pages: 11679-11688, ISSN: 0094-8276

Journal article

Starkey MJ, Fuselier SA, Desai M, Burch JL, Gomez RG, Mukherjee J, Russell CT, Lai H, Schwartz SJet al., 2019, Acceleration of Interstellar Pickup He+ at Earth's Perpendicular Bow Shock, GEOPHYSICAL RESEARCH LETTERS, Vol: 46, Pages: 10735-10743, ISSN: 0094-8276

Journal article

Fowler CM, Halekas J, Schwartz S, Goodrich KA, Gruesbeck JR, Benna Met al., 2019, The Modulation of Solar Wind Hydrogen Deposition in the Martian Atmosphere by Foreshock Phenomena, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 124, Pages: 7086-7097, ISSN: 2169-9380

Journal article

Shuster JR, Gershman DJ, Chen L-J, Wang S, Bessho N, Dorelli JC, da Silva DE, Giles BL, Paterson WR, Denton RE, Schwartz SJ, Norgred C, Wilder FD, Cassak PA, Swisdak M, Uritsky V, Schiff C, Rager AC, Smith S, Avanov LA, Vinas AFet al., 2019, MMS Measurements of the Vlasov Equation: Probing the Electron Pressure Divergence Within Thin Current Sheets, GEOPHYSICAL RESEARCH LETTERS, Vol: 46, Pages: 7862-7872, ISSN: 0094-8276

Journal article

Wilson LB, Chen L-J, Wang S, Schwartz SJ, Turner DL, Stevens ML, Kasper JC, Osmane A, Caprioli D, Bale SD, Pulupa MP, Salem CS, Goodrich KAet al., 2019, Electron Energy Partition across Interplanetary Shocks. I. Methodology and Data Product, ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, Vol: 243, ISSN: 0067-0049

Journal article

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