Imperial College London

Dr Jonathan P. Eastwood

Faculty of Natural SciencesDepartment of Physics

Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 8101jonathan.eastwood Website

 
 
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Assistant

 

Mr David Owen +44 (0)20 7594 7770

 
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Location

 

6M63Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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117 results found

Eastwood JP, Biffis E, Hapgood MA, Green L, Bisi MM, Bentley RD, Wicks R, McKinnell LA, Gibbs M, Burnett Cet al., 2017, The Economic Impact of Space Weather: Where Do We Stand?, Risk Anal, Vol: 37, Pages: 206-218

Space weather describes the way in which the Sun, and conditions in space more generally, impact human activity and technology both in space and on the ground. It is now well understood that space weather represents a significant threat to infrastructure resilience, and is a source of risk that is wide-ranging in its impact and the pathways by which this impact may occur. Although space weather is growing rapidly as a field, work rigorously assessing the overall economic cost of space weather appears to be in its infancy. Here, we provide an initial literature review to gather and assess the quality of any published assessments of space weather impacts and socioeconomic studies. Generally speaking, there is a good volume of scientific peer-reviewed literature detailing the likelihood and statistics of different types of space weather phenomena. These phenomena all typically exhibit "power-law" behavior in their severity. The literature on documented impacts is not as extensive, with many case studies, but few statistical studies. The literature on the economic impacts of space weather is rather sparse and not as well developed when compared to the other sections, most probably due to the somewhat limited data that are available from end-users. The major risk is attached to power distribution systems and there is disagreement as to the severity of the technological footprint. This strongly controls the economic impact. Consequently, urgent work is required to better quantify the risk of future space weather events.

JOURNAL ARTICLE

Fu HS, Vaivads A, Khotyaintsev YV, André M, Cao JB, Olshevsky V, Eastwood JP, Retinò Aet al., 2017, Intermittent energy dissipation by turbulent reconnection, Geophysical Research Letters, Vol: 44, Pages: 37-43, ISSN: 0094-8276

©2016. American Geophysical Union. All Rights Reserved.Magnetic reconnection—the process responsible for many explosive phenomena in both nature and laboratory—is efficient at dissipating magnetic energy into particle energy. To date, exactly how this dissipation happens remains unclear, owing to the scarcity of multipoint measurements of the “diffusion region” at the sub-ion scale. Here we report such a measurement by Cluster—four spacecraft with separation of 1/5 ion scale. We discover numerous current filaments and magnetic nulls inside the diffusion region of magnetic reconnection, with the strongest currents appearing at spiral nulls (O-lines) and the separatrices. Inside each current filament, kinetic-scale turbulence is significantly increased and the energy dissipation, E′ ⋅ j, is 100 times larger than the typical value. At the jet reversal point, where radial nulls (X-lines) are detected, the current, turbulence, and energy dissipations are surprisingly small. All these features clearly demonstrate that energy dissipation in magnetic reconnection occurs at O-lines but not X-lines.

JOURNAL ARTICLE

Arridge CS, Eastwood JP, Jackman CM, Poh G-K, Slavin JA, Thomsen MF, Andre N, Jia X, Kidder A, Lamy L, Radioti A, Reisenfeld DB, Sergis N, Volwerk M, Walsh AP, Zarka P, Coates AJ, Dougherty MKet al., 2016, Cassini in situ observations of long-duration magnetic reconnection in Saturn's magnetotail, NATURE PHYSICS, Vol: 12, Pages: 268-271, ISSN: 1745-2473

JOURNAL ARTICLE

Burch JL, Torbert RB, Phan TD, Chen L-J, Moore TE, Ergun RE, Eastwood JP, Gershman DJ, Cassak PA, Argall MR, Wang S, Hesse M, Pollock CJ, Giles BL, Nakamura R, Mauk BH, Fuselier SA, Russell CT, Strangeway RJ, Drake JF, Shay MA, Khotyaintsev YV, Lindqvist P-A, Marklund G, Wilder FD, Young DT, Torkar K, Goldstein J, Dorelli JC, Avanov LA, Oka M, Baker DN, Jaynes AN, Goodrich KA, Cohen IJ, Turner DL, Fennell JF, Blake JB, Clemmons J, Goldman M, Newman D, Petrinec SM, Trattner KJ, Lavraud B, Reiff PH, Baumjohann W, Magnes W, Steller M, Lewis W, Saito Y, Coffey V, Chandler Met al., 2016, Electron-scale measurements of magnetic reconnection in space, SCIENCE, Vol: 352, ISSN: 0036-8075

JOURNAL ARTICLE

Eastwood JP, Phan TD, Cassak PA, Gershman DJ, Haggerty C, Malakit K, Shay MA, Mistry R, Oieroset M, Russell CT, Slavin JA, Argall MR, Avanov LA, Burch JL, Chen LJ, Dorelli JC, Ergun RE, Giles BL, Khotyaintsev Y, Lavraud B, Lindqvist PA, Moore TE, Nakamura R, Paterson W, Pollock C, Strangeway RJ, Torbert RB, Wang Set al., 2016, Ion-scale secondary flux ropes generated by magnetopause reconnection as resolved by MMS, GEOPHYSICAL RESEARCH LETTERS, Vol: 43, Pages: 4716-4724, ISSN: 0094-8276

JOURNAL ARTICLE

Ergun RE, Goodrich KA, Wilder FD, Holmes JC, Stawarz JE, Eriksson S, Sturner AP, Malaspina DM, Usanova ME, Torbert RB, Lindqvist P-A, Khotyaintsev Y, Burch JL, Strangeway RJ, Russell CT, Pollock CJ, Giles BL, Hesse M, Chen LJ, Lapenta G, Goldman MV, Newman DL, Schwartz SJ, Eastwood JP, Phan TD, Mozer FS, Drake J, Shay MA, Cassak PA, Nakamura R, Marklund Get al., 2016, Magnetospheric Multiscale Satellites Observations of Parallel Electric Fields Associated with Magnetic Reconnection, PHYSICAL REVIEW LETTERS, Vol: 116, ISSN: 0031-9007

JOURNAL ARTICLE

Ergun RE, Holmes JC, Goodrich KA, Wilder FD, Stawarz JE, Eriksson S, Newman DL, Schwartz SJ, Goldman MV, Sturner AP, Malaspina DM, Usanova ME, Torbert RB, Argall M, Lindqvist P-A, Khotyaintsev Y, Burch JL, Strangeway RJ, Russell CT, Pollock CJ, Giles BL, Dorelli JJC, Avanov L, Hesse M, Chen LJ, Lavraud B, Le Contel O, Retino A, Phan TD, Eastwood JP, Oieroset M, Drake J, Shay MA, Cassak PA, Nakamura R, Zhou M, Ashour-Abdalla M, Andre Met al., 2016, Magnetospheric Multiscale observations of large-amplitude, parallel, electrostatic waves associated with magnetic reconnection at the magnetopause, GEOPHYSICAL RESEARCH LETTERS, Vol: 43, Pages: 5626-5634, ISSN: 0094-8276

JOURNAL ARTICLE

Farrugia CJ, Lavraud B, Torbert RB, Argall M, Kacem I, Yu W, Alm L, Burch J, Russell CT, Shuster J, Dorelli J, Eastwood JP, Ergun RE, Fuselier S, Gershman D, Giles BL, Khotyaintsev YV, Lindqvist PA, Matsui H, Marklund GT, Phan TD, Paulson K, Pollock C, Strangeway RJet al., 2016, Magnetospheric Multiscale Mission observations and non-force free modeling of a flux transfer event immersed in a super-Alfvenic flow, GEOPHYSICAL RESEARCH LETTERS, Vol: 43, Pages: 6070-6077, ISSN: 0094-8276

JOURNAL ARTICLE

Krupar V, Eastwood JP, Kruparova O, Santolik O, Soucek J, Magdalenic J, Vourlidas A, Maksimovic M, Bonnin X, Bothmer V, Mrotzek N, Pluta A, Barnes D, Davies JA, Oliveros JCM, Bale SDet al., 2016, AN ANALYSIS OF INTERPLANETARY SOLAR RADIO EMISSIONS ASSOCIATED WITH A CORONAL MASS EJECTION, ASTROPHYSICAL JOURNAL LETTERS, Vol: 823, ISSN: 2041-8205

JOURNAL ARTICLE

Kubicka M, Möstl C, Amerstorfer T, Boakes PD, Feng L, Eastwood JP, Törmänen Oet al., 2016, PREDICTION of GEOMAGNETIC STORM STRENGTH from INNER HELIOSPHERIC in SITU OBSERVATIONS, Astrophysical Journal, Vol: 833, ISSN: 0004-637X

© 2016. The American Astronomical Society. All rights reserved.Prediction of the effects of coronal mass ejections (CMEs) on Earth strongly depends on knowledge of the interplanetary magnetic field southward component, Bz. Predicting the strength and duration of Bz inside a CME with sufficient accuracy is currently impossible, forming the so-called Bz problem. Here, we provide a proof-of-concept of a new method for predicting the CME arrival time, speed, Bz, and resulting disturbance storm time (Dst) index on Earth based only on magnetic field data, measured in situ in the inner heliosphere (<1 au). On 2012 June 12-16, three approximately Earthward-directed and interacting CMEs were observed by the Solar Terrestrial Relations Observatory imagers and Venus Express (VEX) in situ at 0.72 au, 6° away from the Sun-Earth line. The CME kinematics are calculated using the drag-based and WSA-Enlil models, constrained by the arrival time at VEX, resulting in the CME arrival time and speed on Earth. The CME magnetic field strength is scaled with a power law from VEX to Wind. Our investigation shows promising results for the Dst forecast (predicted: -96 and -114 nT (from 2 Dst models); observed: -71 nT), for the arrival speed (predicted: 531 ±23 km s-1; observed: 488 ±30 km s-1), and for the timing (6 ±1 hr after the actual arrival time). The prediction lead time is 21 hr. The method may be applied to vector magnetic field data from a spacecraft at an artificial Lagrange point between the Sun and Earth or to data taken by any spacecraft temporarily crossing the Sun-Earth line.

JOURNAL ARTICLE

Lavraud B, Liu Y, Segura K, He J, Qin G, Temmer M, Vial J-C, Xiong M, Davies JA, Rouillard AP, Pinto R, Auchere F, Harrison RA, Eyles C, Gan W, Lamy P, Xia L, Eastwood JP, Kong L, Wang J, Wimmer-Schweingruber RF, Zhang S, Zong Q, Soucek J, An J, Prech L, Zhang A, Rochus P, Bothmer V, Janvier M, Maksimovic M, Escoubet CP, Kilpua EKJ, Tappin J, Vainio R, Poedts S, Dunlop MW, Savani N, Gopalswamy N, Bale SD, Li G, Howard T, DeForest C, Webb D, Lugaz N, Fuselier SA, Dalmasse K, Tallineau J, Vranken D, Fernandez JGet al., 2016, A small mission concept to the Sun-Earth Lagrangian L5 point for innovative solar, heliospheric and space weather science, JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, Vol: 146, Pages: 171-185, ISSN: 1364-6826

JOURNAL ARTICLE

Lavraud B, Zhang YC, Vernisse Y, Gershman DJ, Dorelli J, Cassak PA, Dargent J, Pollock C, Giles B, Aunai N, Argall M, Avanov L, Barrie A, Burch J, Chandler M, Chen L-J, Clark G, Cohen I, Coffey V, Eastwood JP, Egedal J, Eriksson S, Ergun R, Farrugia CJ, Fuselier SA, Genot V, Graham D, Grigorenko E, Hasegawa H, Jacquey C, Kacem I, Khotyaintsev Y, MacDonald E, Magnes W, Marchaudon A, Mauk B, Moore TE, Mukai T, Nakamura R, Paterson W, Penou E, Phan TD, Rager A, Retino A, Rong ZJ, Russell CT, Saito Y, Sauvaud J-A, Schwartz SJ, Shen C, Smith S, Strangeway R, Toledo-Redondo S, Torbert R, Turner DL, Wang S, Yokota Set al., 2016, Currents and associated electron scattering and bouncing near the diffusion region at Earth's magnetopause, GEOPHYSICAL RESEARCH LETTERS, Vol: 43, Pages: 3042-3050, ISSN: 0094-8276

JOURNAL ARTICLE

Mejnertsen L, Eastwood JP, Chittenden JP, Masters Aet al., 2016, Global MHD simulations of Neptune's magnetosphere, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 121, Pages: 7497-7513, ISSN: 2169-9380

JOURNAL ARTICLE

Mistry R, Eastwood JP, Haggerty CC, Shay MA, Phan TD, Hietala H, Cassak PAet al., 2016, Observations of Hall Reconnection Physics Far Downstream of the X Line, PHYSICAL REVIEW LETTERS, Vol: 117, ISSN: 0031-9007

JOURNAL ARTICLE

Oieroset M, Phan TD, Haggerty C, Shay MA, Eastwood JP, Gershman DJ, Drake JF, Fujimoto M, Ergun RE, Mozer FS, Oka M, Torbert RB, Burch JL, Wang S, Chen LJ, Swisdak M, Pollock C, Dorelli JC, Fuselier SA, Lavraud B, Giles BL, Moore TE, Saito Y, Avanov LA, Paterson W, Strangeway RJ, Russell CT, Khotyaintsev Y, Lindqvist PA, Malakit Ket al., 2016, MMS observations of large guide field symmetric reconnection between colliding reconnection jets at the center of a magnetic flux rope at the magnetopause, GEOPHYSICAL RESEARCH LETTERS, Vol: 43, Pages: 5536-5544, ISSN: 0094-8276

JOURNAL ARTICLE

Phan TD, Eastwood JP, Cassak PA, Oieroset M, Gosling JT, Gershman DJ, Mozer FS, Shay MA, Fujimoto M, Daughton W, Drake JF, Burch JL, Torbert RB, Ergun RE, Chen LJ, Wang S, Pollock C, Dorelli JC, Lavraud B, Giles BL, Moore TE, Saito Y, Avanov LA, Paterson W, Strangeway RJ, Russell CT, Khotyaintsev Y, Lindqvist PA, Oka M, Wilder FDet al., 2016, MMS observations of electron-scale filamentary currents in the reconnection exhaust and near the X line, GEOPHYSICAL RESEARCH LETTERS, Vol: 43, Pages: 6060-6069, ISSN: 0094-8276

JOURNAL ARTICLE

Phan TD, Shay MA, Eastwood JP, Angelopoulos V, Oieroset M, Oka M, Fujimoto Met al., 2016, Establishing the Context for Reconnection Diffusion Region Encounters and Strategies for the Capture and Transmission of Diffusion Region Burst Data by MMS, Space Science Reviews, Vol: 199, Pages: 631-650, ISSN: 0038-6308

© 2015, The Author(s).This paper describes the efforts of our Inter-Disciplinary Scientist (IDS) team to (a) establish the large-scale context for reconnection diffusion region encounters by MMS at the magnetopause and in the magnetotail, including the distinction between X-line and O-line encounters, that would help the identification of diffusion regions in spacecraft data, and (b) devise possible strategies that can be used by MMS to capture and transmit burst data associated with diffusion region candidates. At the magnetopause we suggest the strategy of transmitting burst data from all magnetopause crossings so that no magnetopause reconnection diffusion regions encountered by the spacecraft will be missed. The strategy is made possible by the MMS mass memory and downlink budget. In the magnetotail, it is estimated that MMS will be able to transmit burst data for all diffusion regions, all reconnection jet fronts (a.k.a. dipolarization fronts) and separatrix encounters, but less than 50 % of reconnection exhausts encountered by the spacecraft. We also discuss automated burst trigger schemes that could capture various reconnection-related phenomena. The identification of candidate diffusion region encounters by the burst trigger schemes will be verified and improved by a Scientist-In-The-Loop (SITL). With the knowledge of the properties of the region surrounding the diffusion region and the combination of automated burst triggers and further optimization by the SITL, MMS should be able to capture most diffusion regions it encounters.

JOURNAL ARTICLE

Phan TD, Shay MA, Haggerty CC, Gosling JT, Eastwood JP, Fujimoto M, Malakit K, Mozer FS, Cassak PA, Oieroset M, Angelopoulos Vet al., 2016, Ion Larmor radius effects near a reconnection X line at the magnetopause: THEMIS observations and simulation comparison, Geophysical Research Letters, Vol: 43, Pages: 8844-8852, ISSN: 0094-8276

©2016. American Geophysical Union. All Rights Reserved.We report a Time History of Events and Macroscale Interactions during Substorms (THEMIS-D) spacecraft crossing of a magnetopause reconnection exhaust ~9 ion skin depths (di) downstream of an X line. The crossing was characterized by ion jetting at speeds substantially below the predicted reconnection outflow speed. In the magnetospheric inflow region THEMIS detected (a) penetration of magnetosheath ions and the resulting flows perpendicular to the reconnection plane, (b) ion outflow extending into the magnetosphere, and (c) enhanced electron parallel temperature. Comparison with a simulation suggests that these signatures are associated with the gyration of magnetosheath ions onto magnetospheric field lines due to the shift of the flow stagnation point toward the low-density magnetosphere. Our observations indicate that these effects, ~2–3 di in width, extend at least 9 di downstream of the X line. The detection of these signatures could indicate large-scale proximity of the X line but do not imply that the spacecraft was upstream of the electron diffusion region.

JOURNAL ARTICLE

Plotnikov I, Rouillard AP, Davies JA, Bothmer V, Eastwood JP, Gallagher P, Harrison RA, Kilpua E, Moestl C, Perry CH, Rodriguez L, Lavraud B, Genot V, Pinto RF, Sanchez-Diaz Eet al., 2016, Long-Term Tracking of Corotating Density Structures Using Heliospheric Imaging, SOLAR PHYSICS, Vol: 291, Pages: 1853-1875, ISSN: 0038-0938

JOURNAL ARTICLE

Stawarz JE, Eriksson S, Wilder FD, Ergun RE, Schwartz SJ, Pouquet A, Burch JL, Giles BL, Khotyaintsev Y, Le Contel O, Lindqvist P-A, Magnes W, Pollock CJ, Russell CT, Strangeway RJ, Torbert RB, Avanov LA, Dorelli JC, Eastwood JP, Gershman DJ, Goodrich KA, Malaspina DM, Marklund GT, Mirioni L, Sturner APet al., 2016, Observations of turbulence in a Kelvin-Helmholtz event on 8 September 2015 by the Magnetospheric Multiscale mission, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 121, Pages: 11021-11034, ISSN: 2169-9380

JOURNAL ARTICLE

Vaivads A, Retino A, Soucek J, Khotyaintsev YV, Valentini F, Escoubet CP, Alexandrova O, Andre M, Bale SD, Balikhin M, Burgessl D, Camporeale E, Caprioli D, Chen CHK, Clacey E, Cully CM, De Keyser J, Eastwood JP, Fazakerley AN, Eriksson S, Goldstein ML, Graham DB, Haaland S, Hoshino M, Ji H, Karimabadi H, Kucharek H, Lavraud B, Marcucci F, Matthaeus WH, Moore TE, Nakamura R, Narita Y, Nemecek Z, Norgren C, Opgenoorth H, Palmroth M, Perrone D, Pinqon J-L, Rathsman P, Rothkaeh H, Sahraoui F, Servidio S, Sorriso-Valvo L, Vainio R, Voeroes Z, Wimmer-Schweingruber RFet al., 2016, Turbulence Heating ObserveR - satellite mission proposal, JOURNAL OF PLASMA PHYSICS, Vol: 82, ISSN: 0022-3778

JOURNAL ARTICLE

Archer MO, Horbury TS, Brown P, Eastwood JP, Oddy TM, Whiteside BJ, Sample JGet al., 2015, The MAGIC of CINEMA: first in-flight science results from a miniaturised anisotropic magnetoresistive magnetometer, ANNALES GEOPHYSICAE, Vol: 33, Pages: 725-735, ISSN: 0992-7689

JOURNAL ARTICLE

Balogh A, Bykov A, Eastwood J, Kaastra Jet al., 2015, Multi-scale Structure Formation and Dynamics in Cosmic Plasmas, SPACE SCIENCE REVIEWS, Vol: 188, Pages: 1-2, ISSN: 0038-6308

JOURNAL ARTICLE

Eastwood JP, 2015, Observing magnetic reconnection: The influence of Jim Dungey, Pages: 181-197, ISBN: 9783319183589

© Springer International Publishing Switzerland 2015.As part of the Festspiel celebrating the 90th birthday of Prof. Jim Dungey, this paper reviews his influence on experimental efforts to observe reconnection in space plasmas. Jim has influenced this area of research in two key ways: firstly, in the development of theories of magnetic reconnection and secondly, in being an early and vocal advocate of the need for multi-point observations. The advent of multi-point missions such as Cluster and THEMIS in the past decade has enabled considerable progress, and we illustrate with examples how multi-point data and techniques have indeed improved our understanding of how reconnection works.

BOOK CHAPTER

Eastwood JP, Goldman MV, Hietala H, Newman DL, Mistry R, Lapenta Get al., 2015, Ion reflection and acceleration near magnetotail dipolarization fronts associated with magnetic reconnection, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 120, Pages: 511-525, ISSN: 2169-9380

JOURNAL ARTICLE

Eastwood JP, Hietala H, Toth G, Phan TD, Fujimoto Met al., 2015, What Controls the Structure and Dynamics of Earth's Magnetosphere?, SPACE SCIENCE REVIEWS, Vol: 188, Pages: 251-286, ISSN: 0038-6308

JOURNAL ARTICLE

Eastwood JP, Kataria DO, McInnes CR, Barnes NC, Mulligan Pet al., 2015, Sunjammer, WEATHER, Vol: 70, Pages: 27-30, ISSN: 0043-1656

JOURNAL ARTICLE

Hietala H, Drake JF, Phan TD, Eastwood JP, McFadden JPet al., 2015, Ion temperature anisotropy across a magnetotail reconnection jet, GEOPHYSICAL RESEARCH LETTERS, Vol: 42, Pages: 7239-7247, ISSN: 0094-8276

JOURNAL ARTICLE

Mistry R, Eastwood JP, Hietala H, 2015, Detection of small-scale folds at a solar wind reconnection exhaust, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 120, Pages: 30-42, ISSN: 2169-9380

JOURNAL ARTICLE

Mistry R, Eastwood JP, Phan TD, Hietala Het al., 2015, Development of bifurcated current sheets in solar wind reconnection exhausts, GEOPHYSICAL RESEARCH LETTERS, Vol: 42, Pages: 10513-10520, ISSN: 0094-8276

JOURNAL ARTICLE

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