Articles | Volume 34, issue 2
https://doi.org/10.5194/angeo-34-303-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-34-303-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
A statistical study on the shape and position of the magnetotail neutral sheet
Sudong Xiao
CAS Key Laboratory of Geospace Environment, University of Science and
Technology of China, Hefei, China
Tielong Zhang
CORRESPONDING AUTHOR
CAS Key Laboratory of Geospace Environment, University of Science and
Technology of China, Hefei, China
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Yasong Ge
Institute of Geology and Geophysics, Chinese Academy of Sciences,
Beijing, China
Guoqiang Wang
CAS Key Laboratory of Geospace Environment, University of Science and
Technology of China, Hefei, China
Wolfgang Baumjohann
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Rumi Nakamura
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
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Occasional deviations in density and magnetic power spectral densities in an intermediate frequency range are interpreted as an ion-inertial-range response to either the Kolmogorov or Iroshnikov–Kraichnan inertial-range turbulent velocity spectrum.
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Rudolf A. Treumann and Wolfgang Baumjohann
Ann. Geophys., 36, 1015–1026, https://doi.org/10.5194/angeo-36-1015-2018, https://doi.org/10.5194/angeo-36-1015-2018, 2018
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The physics of the magnetic mirror mode in its final state of saturation, the thermodynamic equilibrium, is re-examined to demonstrate that the mirror mode is the classical analogue of a superconducting effect in an anisotropic-pressure space plasma. Three different spatial correlation scales are identified which control the behaviour of its evolution into large-amplitude chains of mirror bubbles.
Rudolf A. Treumann and Wolfgang Baumjohann
Ann. Geophys., 35, 1353–1360, https://doi.org/10.5194/angeo-35-1353-2017, https://doi.org/10.5194/angeo-35-1353-2017, 2017
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Poynting's theorem provides a way to determine the spectrum of the dissipation function in magnetic turbulence. It is shown that it includes all contributions of the mechanical part of turbulence. Application to solar wind data identifies the inertial range as a state of self-organization and brings the Taylor hypothesis into question.
Sudong Xiao, Tielong Zhang, Guoqiang Wang, Martin Volwerk, Yasong Ge, Daniel Schmid, Rumi Nakamura, Wolfgang Baumjohann, and Ferdinand Plaschke
Ann. Geophys., 35, 1015–1022, https://doi.org/10.5194/angeo-35-1015-2017, https://doi.org/10.5194/angeo-35-1015-2017, 2017
Rudolf A. Treumann and Wolfgang Baumjohann
Ann. Geophys., 35, 999–1013, https://doi.org/10.5194/angeo-35-999-2017, https://doi.org/10.5194/angeo-35-999-2017, 2017
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It is suggested that collisionless reconnection under conditions of very strong current-parallel guide fields in dilute plasmas should become a rather efficient source of electromagnetic radiation in the free space modes X and O and their harmonics. The mechanism is based on the electron cyclotron maser instability (ECMI), which can be excited by the anisotropic weakly relativistic electron distribution in the many inertial lengths long electron exhausts caused in reconnection.
Rudolf A. Treumann and Wolfgang Baumjohann
Ann. Geophys., 35, 683–690, https://doi.org/10.5194/angeo-35-683-2017, https://doi.org/10.5194/angeo-35-683-2017, 2017
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We extend the Klimontovich (1967) formulation of kinetic theory of the evolution of the microscopic phase space density to taking into account that the interaction between particles separated from each other at a distance is not instantaneous but requires the transport of information. This is done by reference to the retarded potentials. We derive the fundamental causal Liouville equation for the phase space density of a system composed of a very large number of charged particles.
Martin Volwerk, Daniel Schmid, Bruce T. Tsurutani, Magda Delva, Ferdinand Plaschke, Yasuhito Narita, Tielong Zhang, and Karl-Heinz Glassmeier
Ann. Geophys., 34, 1099–1108, https://doi.org/10.5194/angeo-34-1099-2016, https://doi.org/10.5194/angeo-34-1099-2016, 2016
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The behaviour of mirror mode waves in Venus's magnetosheath is investigated for solar minimum and maximum conditions. It is shown that the total observational rate of these waves does not change much; however, the distribution over the magnetosheath is significantly different, as well as the growth and decay of the waves during these different solar activity conditions.
David Fischer, Werner Magnes, Christian Hagen, Ivan Dors, Mark W. Chutter, Jerry Needell, Roy B. Torbert, Olivier Le Contel, Robert J. Strangeway, Gernot Kubin, Aris Valavanoglou, Ferdinand Plaschke, Rumi Nakamura, Laurent Mirioni, Christopher T. Russell, Hannes K. Leinweber, Kenneth R. Bromund, Guan Le, Lawrence Kepko, Brian J. Anderson, James A. Slavin, and Wolfgang Baumjohann
Geosci. Instrum. Method. Data Syst., 5, 521–530, https://doi.org/10.5194/gi-5-521-2016, https://doi.org/10.5194/gi-5-521-2016, 2016
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This paper describes frequency and timing calibration, modeling and data processing and calibration for MMS magnetometers, resulting in a merged search choil and fluxgate data product.
Egor V. Yushkov, Anton V. Artemyev, Anatoly A. Petrukovich, and Rumi Nakamura
Ann. Geophys., 34, 739–750, https://doi.org/10.5194/angeo-34-739-2016, https://doi.org/10.5194/angeo-34-739-2016, 2016
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Rudolf A. Treumann and Wolfgang Baumjohann
Ann. Geophys., 34, 737–738, https://doi.org/10.5194/angeo-34-737-2016, https://doi.org/10.5194/angeo-34-737-2016, 2016
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The rigorous derivation of the Jüttner (covariant Boltzmann) distribution is provided for anisotropic pressure (or temperature) tensors. It was in similar form anticipated first by Gladd (1983). Its manifestly covariant version follows straightforwardly from its scalar property.
Rudolf A. Treumann, Wolfgang Baumjohann, and Yasuhito Narita
Ann. Geophys., 34, 673–689, https://doi.org/10.5194/angeo-34-673-2016, https://doi.org/10.5194/angeo-34-673-2016, 2016
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In support of low-frequency electromagnetic turbulence we formulate the inverse scattering theory of electromagnetic fluctuations in plasma. Its solution provides the turbulent response function which contains all information of the dynamical causes of the electromagnetic fluctuations. This is of basic interest in any electromagnetic turbulence. It requires measurement of magnetic and electric fluctuations but makes no direct use of the turbulent power spectral density.
Rudolf A. Treumann and Wolfgang Baumjohann
Ann. Geophys., 34, 557–564, https://doi.org/10.5194/angeo-34-557-2016, https://doi.org/10.5194/angeo-34-557-2016, 2016
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It is demonstrated that the statistical mechanical partition function can be used to construct various different forms of phase space distributions. This indicates that its structure is not restricted to the Gibbs–Boltzmann factor prescription based on counting statistics. Consequences concerning generalised Lorentzians and more general distribution functions are discussed.
Takuma Nakamura, Rumi Nakamura, and Hiroshi Haseagwa
Ann. Geophys., 34, 357–367, https://doi.org/10.5194/angeo-34-357-2016, https://doi.org/10.5194/angeo-34-357-2016, 2016
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Magnetic reconnection is a key process in space and laboratory plasmas which transfers energies through the magnetic field topology change. The topology change in this process takes place in a small scale region called the electron diffusion region (EDR). In this paper, using high-resolution fully kinetic simulations, we successfully obtained the firm scaling laws of spatial dimensions of the EDR. The obtained scalings allow us to precisely predict observable dimensions of the EDR in real space.
Y. Narita, R. Nakamura, W. Baumjohann, K.-H. Glassmeier, U. Motschmann, and H. Comişel
Ann. Geophys., 34, 85–89, https://doi.org/10.5194/angeo-34-85-2016, https://doi.org/10.5194/angeo-34-85-2016, 2016
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Four-spacecraft Cluster observations of turbulent fluctuations in the magnetic reconnection region in the geomagnetic tail show for the first time an indication of ion Bernstein waves, electromagnetic waves that propagate nearly perpendicular to the mean magnetic field and are in resonance with ions. Bernstein waves may influence current sheet dynamics in the reconnection outflow such as a bifurcation of the current sheet.
R. A. Treumann and W. Baumjohann
Ann. Geophys., 32, 975–989, https://doi.org/10.5194/angeo-32-975-2014, https://doi.org/10.5194/angeo-32-975-2014, 2014
D. Schmid, M. Volwerk, F. Plaschke, Z. Vörös, T. L. Zhang, W. Baumjohann, and Y. Narita
Ann. Geophys., 32, 651–657, https://doi.org/10.5194/angeo-32-651-2014, https://doi.org/10.5194/angeo-32-651-2014, 2014
R. A. Treumann and W. Baumjohann
Ann. Geophys., 32, 643–650, https://doi.org/10.5194/angeo-32-643-2014, https://doi.org/10.5194/angeo-32-643-2014, 2014
R. Wang, R. Nakamura, T. Zhang, A. Du, W. Baumjohann, Q. Lu, and A. N. Fazakerley
Ann. Geophys., 32, 239–248, https://doi.org/10.5194/angeo-32-239-2014, https://doi.org/10.5194/angeo-32-239-2014, 2014
H. Aryan, M. A. Balikhin, A. Taktakishvili, and T. L. Zhang
Ann. Geophys., 32, 223–230, https://doi.org/10.5194/angeo-32-223-2014, https://doi.org/10.5194/angeo-32-223-2014, 2014
I. Y. Vasko, A. V. Artemyev, A. A. Petrukovich, R. Nakamura, and L. M. Zelenyi
Ann. Geophys., 32, 133–146, https://doi.org/10.5194/angeo-32-133-2014, https://doi.org/10.5194/angeo-32-133-2014, 2014
R. Nakamura, F. Plaschke, R. Teubenbacher, L. Giner, W. Baumjohann, W. Magnes, M. Steller, R. B. Torbert, H. Vaith, M. Chutter, K.-H. Fornaçon, K.-H. Glassmeier, and C. Carr
Geosci. Instrum. Method. Data Syst., 3, 1–11, https://doi.org/10.5194/gi-3-1-2014, https://doi.org/10.5194/gi-3-1-2014, 2014
R. A. Treumann and W. Baumjohann
Nonlin. Processes Geophys., 21, 143–148, https://doi.org/10.5194/npg-21-143-2014, https://doi.org/10.5194/npg-21-143-2014, 2014
Y. Narita, R. Nakamura, and W. Baumjohann
Ann. Geophys., 31, 1605–1610, https://doi.org/10.5194/angeo-31-1605-2013, https://doi.org/10.5194/angeo-31-1605-2013, 2013
R. A. Treumann and W. Baumjohann
Ann. Geophys., 31, 1191–1193, https://doi.org/10.5194/angeo-31-1191-2013, https://doi.org/10.5194/angeo-31-1191-2013, 2013
A. V. Artemyev, A. A. Petrukovich, R. Nakamura, and L. M. Zelenyi
Ann. Geophys., 31, 1109–1114, https://doi.org/10.5194/angeo-31-1109-2013, https://doi.org/10.5194/angeo-31-1109-2013, 2013
M. Volwerk, N. André, C. S. Arridge, C. M. Jackman, X. Jia, S. E. Milan, A. Radioti, M. F. Vogt, A. P. Walsh, R. Nakamura, A. Masters, and C. Forsyth
Ann. Geophys., 31, 817–833, https://doi.org/10.5194/angeo-31-817-2013, https://doi.org/10.5194/angeo-31-817-2013, 2013
A. Alexandrova, R. Nakamura, V. S. Semenov, I. V. Kubyshkin, S. Apatenkov, E. V. Panov, D. Korovinskiy, H. Biernat, W. Baumjohann, K.-H. Glassmeier, and J. P. McFadden
Ann. Geophys., 30, 1727–1741, https://doi.org/10.5194/angeo-30-1727-2012, https://doi.org/10.5194/angeo-30-1727-2012, 2012