Imperial College London

Dr Jonathan P. Eastwood

Faculty of Natural SciencesDepartment of Physics

Senior Lecturer
 
 
 
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Contact

 

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

 
 
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Location

 

6M63Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

155 results found

Zouganelis I, Maksimovic M, Meyer-Vernet N, Bale SD, Eastwood JP, Zaslavsky A, Dekkali M, Goetz K, Kaiser MLet al., 2010, Measurements of stray antenna capacitance in the STEREO/WAVES instrument: Comparison of the measured voltage spectrum with an antenna electron shot noise model, RADIO SCIENCE, Vol: 45, ISSN: 0048-6604

Journal article

Eastwood JP, Wheatland MS, Hudson HS, Krucker S, Bale SD, Maksimovic M, Goetz K, Bougeret J-Let al., 2010, ON THE BRIGHTNESS AND WAITING-TIME DISTRIBUTIONS OF A TYPE III RADIO STORM OBSERVED BY STEREO/WAVES, ASTROPHYSICAL JOURNAL LETTERS, Vol: 708, Pages: L95-L99

Journal article

Halekas JS, Eastwood JP, Brain DA, Phan TD, Oieroset M, Lin RPet al., 2009, In situ observations of reconnection Hall magnetic fields at Mars: Evidence for ion diffusion region encounters, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 114, ISSN: 2169-9380

Journal article

Lavraud B, Borovsky JE, GĂ©not V, Schwartz SJ, Birn J, Fazakerley AN, Dunlop MW, Taylor MGGT, Hasegawa H, Rouillard AP, Berchem J, Bogdanova Y, Constantinescu D, Dandouras I, Eastwood JP, Escoubet CP, Frey H, Jacquey C, Panov E, Pu ZY, Shen C, Shi J, Sibeck DG, Volwerk M, Wild JAet al., 2009, Tracing solar wind plasma entry into the magnetosphere using ion-to-electron temperature ratio, \grl, Vol: 36, Pages: L18109-L18109

Journal article

Jacobsen KS, Phan TD, Eastwood JP, Sibeck DG, Moen JI, Angelopoulos V, McFadden JP, Engebretson MJ, Provan G, Larson D, Fornacon K-Het al., 2009, THEMIS observations of extreme magnetopause motion caused by a hot flow anomaly, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 114, ISSN: 2169-9380

Journal article

Eastwood JP, Bale SD, Maksimovic M, Zouganelis I, Goetz K, Kaiser ML, Bougeret J-Let al., 2009, Measurements of stray antenna capacitance in the STEREO/WAVES instrument: Comparison of the radio frequency voltage spectrum with models of the galactic nonthermal continuum spectrum, RADIO SCIENCE, Vol: 44, ISSN: 0048-6604

Journal article

Eastwood JP, Phan TD, Bale SD, Tjulin Aet al., 2009, Observations of Turbulence Generated by Magnetic Reconnection, PHYSICAL REVIEW LETTERS, Vol: 102, ISSN: 0031-9007

Journal article

Retino A, Nakamura R, Vaivads A, Khotyaintsev Y, Hayakawa T, Tanaka K, Kasahara S, Fujimoto M, Shinohara I, Eastwood JP, Andre M, Baumjohann W, Daly PW, Kronberg EA, Cornilleau-Wehrlin Net al., 2008, Cluster observations of energetic electrons and electromagnetic fields within a reconnecting thin current sheet in the Earth's magnetotail, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 113, ISSN: 2169-9380

Journal article

Eastwood JP, 2008, The science of space weather, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 366, Pages: 4489-4500, ISSN: 1364-503X

Journal article

Oieroset M, Phan TD, Angelopoulos V, Eastwood JP, McFadden J, Larson D, Carlson CW, Glassmeier K-H, Fujimoto M, Raeder Jet al., 2008, THEMIS multi-spacecraft observations of magnetosheath plasma penetration deep into the dayside low-latitude magnetosphere for northward and strong ByIMF, GEOPHYSICAL RESEARCH LETTERS, Vol: 35, ISSN: 0094-8276

Journal article

Eastwood JP, Sibeck DG, Angelopoulos V, Phan TD, Bale SD, McFadden JP, Cully CM, Mende SB, Larson D, Frey S, Carlson CW, Glassmeier K-H, Auster HU, Roux A, Le Contel Oet al., 2008, THEMIS observations of a hot flow anomaly: Solar wind, magnetosheath, and ground-based measurements, GEOPHYSICAL RESEARCH LETTERS, Vol: 35, ISSN: 0094-8276

Journal article

Bougeret JL, Goetz K, Kaiser ML, Bale SD, Kellogg PJ, Maksimovic M, Monge N, Monson SJ, Astier PL, Davy S, Dekkali M, Hinze JJ, Manning RE, Aguilar-Rodriguez E, Bonnin X, Briand C, Cairns IH, Cattell CA, Cecconi B, Eastwood J, Ergun RE, Fainberg J, Hoang S, Huttunen KEJ, Krucker S, Lecacheux A, MacDowall RJ, Macher W, Mangeney A, Meetre CA, Moussas X, Nguyen QN, Oswald TH, Pulupa M, Reiner MJ, Robinson PA, Rucker H, Salem C, Santolik O, Silvis JM, Ullrich R, Zarka P, Zouganelis Iet al., 2008, S/WAVES: The radio and plasma wave investigation on the STEREO Mission, SPACE SCIENCE REVIEWS, Vol: 136, Pages: 487-528, ISSN: 0038-6308

Journal article

Eastwood JP, Brain DA, Halekas JS, Drake JF, Phan TD, Oieroset M, Mitchell DL, Lin RP, Acuna Met al., 2008, Evidence for collisionless magnetic reconnection at Mars, GEOPHYSICAL RESEARCH LETTERS, Vol: 35, ISSN: 0094-8276

Journal article

Dunlop MW, Eastwood JP, 2008, The curlometer and other gradient based methods, Multi-spacecraft Analysis Methods Revisited, Editors: Paschmann, Daly, Noordwijk, The Netherlands, Publisher: ESA Communications, Pages: 17-25

Book chapter

Phan TD, Drake JF, Shay MA, Mozer FS, Eastwood JPet al., 2007, Evidence for an elongated (> 60 ion skin depths) electron diffusion region during fast magnetic reconnection, PHYSICAL REVIEW LETTERS, Vol: 99, ISSN: 0031-9007

Journal article

Eastwood JP, Bale SD, Mozer FS, Hull AJet al., 2007, Contributions to the cross shock electric field at a quasiperpendicular collisionless shock, GEOPHYSICAL RESEARCH LETTERS, Vol: 34, ISSN: 0094-8276

Journal article

Phan TD, Paschmann G, Twitty C, Mozer FS, Gosling JT, Eastwood JP, Oieroset M, Reme H, Lucek EAet al., 2007, Evidence for magnetic reconnection initiated in the magnetosheath, GEOPHYSICAL RESEARCH LETTERS, Vol: 34, ISSN: 0094-8276

Journal article

Eastwood JP, Phan T-D, Mozer FS, Shay MA, Fujimoto M, Retino A, Hesse M, Balogh A, Lucek EA, Dandouras Iet al., 2007, Multi-point observations of the Hall electromagnetic field and secondary island formation during magnetic reconnection, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 112, ISSN: 2169-9380

Journal article

Eastwood JP, Sibeck DG, Slavin JA, Lavraud B, Lucek EA, Balogh A, Dandouras Iet al., 2006, Observations of flux ropes and X-lines in the near earth magnetotail, European Space Agency, (Special Publication) ESA SP, Pages: 59-66, ISSN: 0379-6566

Magnetic reconnection in the Earth's magnetotail plays a key role in controlling the dynamics of the Earth's magnetosphere. Recent results based on Cluster multi-spacecraft analysis have raised important questions about the traditional interpretation of reconnection-associated phenomena observed by single spacecraft. Cluster has shown that observations conventionally interpreted as a single X-line can correspond to multiple X-line structure [1]. Single point observations cannot distinguish between these two possibilities, and previous interpretations have invoked the simpler picture. This case study is put into a wider context by examining the plasma dynamics following this particular event. Within this picture, one can make the hypothesis that further loop-like structures - small flux ropes - ought to be observed in conjunction with this event. We present such evidence here, and in particular use the curlometer technique to analyse the observations.

Journal article

Kucharek H, Moebius E, Scholer M, Behlke R, Mouikis C, Puhl-Quinn P, Kistler LM, Horbury T, Eastwood J, Bale SD, Mazelle Cet al., 2006, On the ion reflection properties of the quasi-perpendicular earth's bow shock, European Space Agency, (Special Publication) ESA SP, Pages: 299-304, ISSN: 0379-6566

Recent multiple spacecraft observations by Cluster revealed that field-aligned ion beams appear to emerge from the gyrating ions in the ramp of a quasiperpendicular shock created by the same reflection process. A closer look at recent findings show that effective scattering in pitch angle within the shock ramp during the reflection may also be needed to produce these beams at higher shock normal angles. Obviously, ion reflection, transmission and wave particle scattering depend on shock parameters, such as Mach number, plasma beta and shock angle. However, how important are these parameters relative to each other for these processes? Furthermore, the internal dynamics, structure of the shock and the cross-shock potential may also be important. A better understanding would provide very useful information about the ion reflection and transmission process at perpendicular shocks in general for other disciplines such as astrophysics. A survey of shock crossings for a wide range of plasma conditions such as shock normal angle, Mach number, and plasma beta has been compiled and investigated in detail in order to determine the major controlling parameters. In this database we included information about the cross shock potential and magnetic field profile at the shock, as well as the global dynamics of the shock. We will report on dependence of variability of different ion distributions such as the gyration and escaping ions on these various parameters.

Journal article

Eastwood JP, Balogh A, Lucek EA, Mazelle C, Dandouras Iet al., 2005, Quasi-monochromatic ULF foreshock waves as observed by the four-spacecraft Cluster mission: 2. Oblique propagation, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 110, ISSN: 0148-0227

Journal article

Eastwood JP, Balogh A, Lucek EA, Mazelle C, Dandouras Iet al., 2005, Quasi-monochromatic ULF foreshock waves as observed by the four-spacecraft Cluster mission: 1. Statistical properties, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, Vol: 110, ISSN: 0148-0227

Journal article

Tanskanen EI, Slavin JA, Tanskanen AJ, Viljanen A, Pulkkinen TI, Koskinen HEJ, Pulkkinen A, Eastwood Jet al., 2005, Magnetospheric substorms are strongly modulated by interplanetary high-speed streams, GEOPHYSICAL RESEARCH LETTERS, Vol: 32, ISSN: 0094-8276

Journal article

Eastwood JP, Sibeck DG, Slavin JA, Goldstein ML, Lavraud B, Sitnov M, Imber S, Balogh A, Lucek EA, Dandouras Iet al., 2005, Observations of multiple X-line structure in the Earth's magnetotail current sheet: A Cluster case study, GEOPHYSICAL RESEARCH LETTERS, Vol: 32, ISSN: 0094-8276

Journal article

Goldstein ML, Eastwood JP, Treumann RA, Lucek EA, Pickett J, Decreau Pet al., 2005, The near-earth solar wind, SPACE SCIENCE REVIEWS, Vol: 118, Pages: 7-39, ISSN: 0038-6308

Journal article

Eastwood JP, Lucek EA, Mazelle C, Meziane K, Narita Y, Pickett J, Treumann RAet al., 2005, The foreshock, SPACE SCIENCE REVIEWS, Vol: 118, Pages: 41-94, ISSN: 0038-6308

Journal article

Zheng Y, Le G, Slavin JA, Goldstein ML, Cattell C, Balogh A, Lucek EA, Reme H, Eastwood JP, Wilber M, Parks G, Retino A, Fazakerley Aet al., 2005, Cluster observation of continuous reconnection at dayside magnetopause in the vicinity of cusp, ANNALES GEOPHYSICAE, Vol: 23, Pages: 2199-2215, ISSN: 0992-7689

Journal article

Eastwood JP, Balogh A, Mazelle C, Dandouras I, Reme Het al., 2004, Oblique propagation of 30 s period fast magnetosonic foreshock waves: A Cluster case study, GEOPHYSICAL RESEARCH LETTERS, Vol: 31, ISSN: 0094-8276

Journal article

Meziane K, Mazelle C, Wilber M, LeQueau D, Eastwood JP, Reme H, Dandouras I, Sauvaud JA, Bosqued JM, Parks GK, Kistler LM, McCarthy M, Klecker B, Korth A, Bavassano-Cattaneo MB, Lundin R, Balogh Aet al., 2004, Bow shock specularly reflected ions in the presence of low-frequency electromagnetic waves: a case study, Annales Geophysicae, Vol: 22, Pages: 2325-2335

An energetic ion (E less than or equal to40 keV) event observed by the CLUSTER/CIS experiment upstream of the Earth's bow shock is studied in detail. The ion event is observed in association with quasi-monochromatic ULF MHD-like waves, which we show modulate the ion fluxes. According to three statistical bow shock position models, the Cluster spacecrafts are located at similar to0.5 R-E from the shock and the averaged bow shock theta(Bno) is about similar to30degrees. The analysis of the three-dimensional angular distribution indicates that ions propagating roughly along the magnetic field direction are observed at the onset of the event. Later on, the angular distribution is gyrophase-bunched and the pitch-angle distribution is peaked at alpha(o)similar totheta(Bno), consistent with the specular reflection production mechanism. The analysis of the waves shows that they are left-handed in the spacecraft frame of reference (right-handed in the solar wind frame) and propagate roughly along the ambient magnetic field; we have found that they are in cyclotron-resonance with the field-aligned beam observed just upstream. Using properties of the waves and particles, we explain the observed particle flux-modulation in the context Of theta(Bn) changes at the shock caused by the convected ULF waves. We have found that the high count rates coincide with particles leaving the shock when theta(Bn) angles are less than similar to40degrees, consistent with the specular reflection hypothesis as the production mechanism of ions.

Journal article

Eastwood JP, 2003, The terrestrial foreshock as observed by the multi-spacecraft Cluster mission

Thesis dissertation

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