Articles | Volume 32, issue 8
https://doi.org/10.5194/angeo-32-991-2014
© Author(s) 2014. 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-32-991-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Regular paper
| 
22 Aug 2014
Regular paper |
| 22 Aug 2014
Waves in high-speed plasmoids in the magnetosheath and at the magnetopause
H. Gunell
Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180 Brussels, Belgium
G. Stenberg Wieser
Swedish Institute of Space Physics (IRF), P.O. Box 812, 981 28 Kiruna, Sweden
M. Mella
Swedish Institute of Space Physics (IRF), Box 537, 751 21 Uppsala, Sweden
R. Maggiolo
Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180 Brussels, Belgium
H. Nilsson
Swedish Institute of Space Physics (IRF), P.O. Box 812, 981 28 Kiruna, Sweden
F. Darrouzet
Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180 Brussels, Belgium
M. Hamrin
Department of Physics, Umeå University, 901 87 Umeå, Sweden
T. Karlsson
Space and Plasma Physics, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
N. Brenning
Space and Plasma Physics, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
J. De Keyser
Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180 Brussels, Belgium
Swedish Institute of Space Physics (IRF), Box 537, 751 21 Uppsala, Sweden
I. Dandouras
Institut de Recherche en Astrophysique et Planétologie, UPS-CNRS, 31028 Toulouse, France
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Minna Palmroth, Heli Hietala, Ferdinand Plaschke, Martin Archer, Tomas Karlsson, Xóchitl Blanco-Cano, David Sibeck, Primož Kajdič, Urs Ganse, Yann Pfau-Kempf, Markus Battarbee, and Lucile Turc
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Tomas Karlsson, Ferdinand Plaschke, Heli Hietala, Martin Archer, Xóchitl Blanco-Cano, Primož Kajdič, Per-Arne Lindqvist, Göran Marklund, and Daniel J. Gershman
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We have studied fast plasma jets outside of Earth’s magnetic environment. Such jets are small-scale structures with a limited lifetime, which may be important in determining the properties of the near-Earth space environment, due to their concentrated kinetic energy. We have used data from the NASA Magnetospheric MultiScale (MMS) satellites to study their properties in detail, to understand how these jets are formed. We have found evidence that there are at least two different types of jets.
Elisabet Liljeblad and Tomas Karlsson
Ann. Geophys., 35, 879–884, https://doi.org/10.5194/angeo-35-879-2017, https://doi.org/10.5194/angeo-35-879-2017, 2017
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MESSENGER magnetic field data from the magnetosphere of Mercury have been investigated to identify ultra-low-frequency (ULF) waves. ULF waves in the Kelvin–Helmholtz (KH) wave frequency range are frequently observed in the magnetosphere. These ULF waves often have similar characteristics to previously identified, likely KH-driven ULF waves, indicating that ULF waves in a specific frequency band can be used as a detection tool for KH waves on Mercury.
Rikard Slapak, Maria Hamrin, Timo Pitkänen, Masatoshi Yamauchi, Hans Nilsson, Tomas Karlsson, and Audrey Schillings
Ann. Geophys., 35, 869–877, https://doi.org/10.5194/angeo-35-869-2017, https://doi.org/10.5194/angeo-35-869-2017, 2017
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The ion total transports in the near-Earth plasma sheet have been investigated and quantified. Specifically, the net O+ transport is about 1024 s−1 in the earthward direction, which is 1 order of magnitude smaller than the typical O+ ionospheric outflows, strongly indicating that most outflow will eventually escape, leading to significant atmospheric loss. The study also shows that low-velocity flows (< 100 km s−1) dominate the mass transport in the near-Earth plasma sheet.
Lukas Maes, Romain Maggiolo, and Johan De Keyser
Ann. Geophys., 34, 961–974, https://doi.org/10.5194/angeo-34-961-2016, https://doi.org/10.5194/angeo-34-961-2016, 2016
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Ion outflow from the ionospheric regions at the highest latitudes is mainly driven by solar illumination. It is an important factor affecting atmospheric escape and space weather. But this region rotates into and out of the sunlight on a daily and seasonal basis. This creates daily and seasonal variations in the outflow, even with both hemispheres combined. The north–south asymmetry in Earth's magnetic field causes extra variations and asymmetries. This was studied with a simple empirical model.
M. Volwerk, I. Richter, B. Tsurutani, C. Götz, K. Altwegg, T. Broiles, J. Burch, C. Carr, E. Cupido, M. Delva, M. Dósa, N. J. T. Edberg, A. Eriksson, P. Henri, C. Koenders, J.-P. Lebreton, K. E. Mandt, H. Nilsson, A. Opitz, M. Rubin, K. Schwingenschuh, G. Stenberg Wieser, K. Szegö, C. Vallat, X. Vallieres, and K.-H. Glassmeier
Ann. Geophys., 34, 1–15, https://doi.org/10.5194/angeo-34-1-2016, https://doi.org/10.5194/angeo-34-1-2016, 2016
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The solar wind magnetic field drapes around the active nucleus of comet 67P/CG, creating a magnetosphere. The solar wind density increases and with that the pressure, which compresses the magnetosphere, increasing the magnetic field strength near Rosetta. The higher solar wind density also creates more ionization through collisions with the gas from the comet. The new ions are picked-up by the magnetic field and generate mirror-mode waves, creating low-field high-density "bottles" near 67P/CG.
H. Gunell, L. Andersson, J. De Keyser, and I. Mann
Ann. Geophys., 33, 1331–1342, https://doi.org/10.5194/angeo-33-1331-2015, https://doi.org/10.5194/angeo-33-1331-2015, 2015
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P. M. E. Décréau, S. Aoutou, A. Denazelle, I. Galkina, J.-L. Rauch, X. Vallières, P. Canu, S. Rochel Grimald, F. El-Lemdani Mazouz, and F. Darrouzet
Ann. Geophys., 33, 1285–1300, https://doi.org/10.5194/angeo-33-1285-2015, https://doi.org/10.5194/angeo-33-1285-2015, 2015
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We present here cases of wide banded Non Thermal Continuum (NTC) observed from the multi-point Cluster observatory. We point out that a large portion of the plasmasphere boundary layer, covering magnetic latitudes from 0 to above 30°, is radiating these radio waves. The radiation is confined inside multiple beams of small cone angles. We show how the spectral signature evolves, from integer harmonics of the electron gyrofrequency, when the observatory moves away from their sources.
G. Verbanac, V. Pierrard, M. Bandić, F. Darrouzet, J.-L. Rauch, and P. Décréau
Ann. Geophys., 33, 1271–1283, https://doi.org/10.5194/angeo-33-1271-2015, https://doi.org/10.5194/angeo-33-1271-2015, 2015
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Using Cluster data, we develop plasmapause Lpp models parameterized by solar wind coupling functions and geomagnetic activity indices. We show that the Lpp response to the changes in the interplanetary conditions depends on the magnetic local time. The faster plasmapause response is observed in the post-midnight sector. At low activity, Lpp exhibits the largest values on the dayside. For enhanced activity, displacements towards larger values on the evening side are identified.
H. Gunell, L. Andersson, J. De Keyser, and I. Mann
Ann. Geophys., 33, 279–293, https://doi.org/10.5194/angeo-33-279-2015, https://doi.org/10.5194/angeo-33-279-2015, 2015
Short summary
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A. Varsani, C. J. Owen, A. N. Fazakerley, C. Forsyth, A. P. Walsh, M. André, I. Dandouras, and C. M. Carr
Ann. Geophys., 32, 1093–1117, https://doi.org/10.5194/angeo-32-1093-2014, https://doi.org/10.5194/angeo-32-1093-2014, 2014
Y. V. Khotyaintsev, P.-A. Lindqvist, C. M. Cully, A. I. Eriksson, and M. André
Geosci. Instrum. Method. Data Syst., 3, 143–151, https://doi.org/10.5194/gi-3-143-2014, https://doi.org/10.5194/gi-3-143-2014, 2014
M. Yamauchi, Y. Ebihara, H. Nilsson, and I. Dandouras
Ann. Geophys., 32, 83–90, https://doi.org/10.5194/angeo-32-83-2014, https://doi.org/10.5194/angeo-32-83-2014, 2014
P. M. E. Décréau, S. Kougblénou, G. Lointier, J.-L. Rauch, J.-G. Trotignon, X. Vallières, P. Canu, S. Rochel Grimald, F. El-Lemdani Mazouz, and F. Darrouzet
Ann. Geophys., 31, 2097–2121, https://doi.org/10.5194/angeo-31-2097-2013, https://doi.org/10.5194/angeo-31-2097-2013, 2013
H. Gunell, J. De Keyser, E. Gamby, and I. Mann
Ann. Geophys., 31, 1227–1240, https://doi.org/10.5194/angeo-31-1227-2013, https://doi.org/10.5194/angeo-31-1227-2013, 2013
