155 results found
Zouganelis I, Maksimovic M, Meyer-Vernet N, et 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
Eastwood JP, Wheatland MS, Hudson HS, et 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
Halekas JS, Eastwood JP, Brain DA, et 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
Lavraud B, Borovsky JE, Génot V, et al., 2009, Tracing solar wind plasma entry into the magnetosphere using ion-to-electron temperature ratio, \grl, Vol: 36, Pages: L18109-L18109
Jacobsen KS, Phan TD, Eastwood JP, et 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
Eastwood JP, Bale SD, Maksimovic M, et 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
Eastwood JP, Phan TD, Bale SD, et al., 2009, Observations of Turbulence Generated by Magnetic Reconnection, PHYSICAL REVIEW LETTERS, Vol: 102, ISSN: 0031-9007
Retino A, Nakamura R, Vaivads A, et 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
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
Oieroset M, Phan TD, Angelopoulos V, et 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
Eastwood JP, Sibeck DG, Angelopoulos V, et al., 2008, THEMIS observations of a hot flow anomaly: Solar wind, magnetosheath, and ground-based measurements, GEOPHYSICAL RESEARCH LETTERS, Vol: 35, ISSN: 0094-8276
Bougeret JL, Goetz K, Kaiser ML, et 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
Eastwood JP, Brain DA, Halekas JS, et al., 2008, Evidence for collisionless magnetic reconnection at Mars, GEOPHYSICAL RESEARCH LETTERS, Vol: 35, ISSN: 0094-8276
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
Phan TD, Drake JF, Shay MA, et 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
Eastwood JP, Bale SD, Mozer FS, et al., 2007, Contributions to the cross shock electric field at a quasiperpendicular collisionless shock, GEOPHYSICAL RESEARCH LETTERS, Vol: 34, ISSN: 0094-8276
Phan TD, Paschmann G, Twitty C, et al., 2007, Evidence for magnetic reconnection initiated in the magnetosheath, GEOPHYSICAL RESEARCH LETTERS, Vol: 34, ISSN: 0094-8276
Eastwood JP, Phan T-D, Mozer FS, et 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
Eastwood JP, Sibeck DG, Slavin JA, et 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 . 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.
Kucharek H, Moebius E, Scholer M, et 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.
Eastwood JP, Balogh A, Lucek EA, et 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
Eastwood JP, Balogh A, Lucek EA, et 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
Tanskanen EI, Slavin JA, Tanskanen AJ, et al., 2005, Magnetospheric substorms are strongly modulated by interplanetary high-speed streams, GEOPHYSICAL RESEARCH LETTERS, Vol: 32, ISSN: 0094-8276
Eastwood JP, Sibeck DG, Slavin JA, et 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
Zheng Y, Le G, Slavin JA, et 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
Eastwood JP, Balogh A, Mazelle C, et al., 2004, Oblique propagation of 30 s period fast magnetosonic foreshock waves: A Cluster case study, GEOPHYSICAL RESEARCH LETTERS, Vol: 31, ISSN: 0094-8276
Meziane K, Mazelle C, Wilber M, et 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.
Eastwood JP, 2003, The terrestrial foreshock as observed by the multi-spacecraft Cluster mission
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