Search Publications
Whistler-Langmuir oscillitons and their relation to auroral hiss
Sauer, K.; Sydora, R. D.
A new type of oscilliton (soliton with superimposed spatial oscillations) is described which arises in plasmas if the electron cyclotron frequency Ωe is larger than the electron plasma frequency ωe, which is a typical situation for auroral regions in planetary magnetospheres. Both high-frequency modes of concern, the Langmuir…
Nonlinear electrostatic ion-acoustic "oscilliton" waves driven by charge non-neutrality effects
Liu, W.; Ma, J. Z. G.; Hirose, A. +1 more
Nonlinear "oscilliton" structures features a low-frequency (LF) solitary envelope, the amplitude of which is modulated violently by superimposed high-frequency (HF) oscillations. We have studied the charge non-neutrality effects on the excitation of electrostatic ion-acoustic (IA) oscillitons. A two-fluid, warm plasma model is employed, and a set …
Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapause
André, M.; Lucek, E. A.; Ohtani, S. +6 more
We have analyzed an event on 14 February 2003 in which Cluster satellites and the CPMN ground magnetometer chain made simultaneous observations of a Pi 2 pulsation along the same meridian. Three of the four Cluster satellites were located outside the plasmasphere, while the other one was located within the plasmasphere. By combining the multipoint…
Spatial scales of the magnetic ramp at the Venusian bow shock
Zhang, T. L.; Walker, S. N.; Pope, S. A. +1 more
Typically multi-spacecraft missions are ideally suited to the study of shock spatial scales due to the separation of temporal and spatial variations. These missions are not possible at all locations and therefore in-situ multi-spacecraft measurements are not available beyond the Earth. The present paper presents a study of shock spatial scales usi…
Pitch-angle diffusion coefficients from resonant interactions with electrostatic electron cyclotron harmonic waves in planetary magnetospheres
Singh, K. P.; Singhal, R. P.; Tripathi, A. K.
Pitch-angle diffusion coefficients have been calculated for resonant interaction with electrostatic electron cyclotron harmonic (ECH) waves in the magnetospheres of Earth, Jupiter, Saturn, Uranus and Neptune. Calculations have been performed at two radial distances of each planet. It is found that observed wave electric field amplitudes in the mag…
Corrigendum to "Downward auroral currents from the reconnection Hall-region", published in Ann. Geophys., 29, 679-685, 2011
Nakamura, R.; Baumjohann, W.; Treumann, R. A.
No abstract available.
Corrigendum to "The statistical studies of the inner boundary of plasma sheet" published in Ann. Geophys., 29, 289-298, 2011
Dandouras, I.; Cao, J. B.; Ding, W. Z. +4 more
No abstract available.
On the 3-D reconstruction of Coronal Mass Ejections using coronagraph data
St. Cyr, O. C.; Mierla, M.; Zhukov, A. N. +26 more
Coronal Mass ejections (CMEs) are enormous eruptions of magnetized plasma expelled from the Sun into the interplanetary space, over the course of hours to days. They can create major disturbances in the interplanetary medium and trigger severe magnetic storms when they collide with the Earth's magnetosphere. It is important to know their real spee…
Centrifugal acceleration in the magnetotail lobes
Nilsson, H.; Eriksson, A.; Engwall, E. +2 more
Combined Cluster EFW and EDI measurements have shown that cold ion outflow in the magnetospheric lobes dominates the hydrogen ion outflow from the Earth's atmosphere. The ions have too low kinetic energy to be measurable with particle instruments, at least for the typical spacecraft potential of a sunlit spacecraft in the tenuous lobe plasmas outs…
Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU
Zhang, T. L.; Lucek, E.; Reme, H. +9 more
Interplanetary linear magnetic holes (LMHs) are structures in which the magnetic field magnitude decreases with little change in the field direction. They are a 10-30% subset of all interplanetary magnetic holes (MHs). Using magnetic field and plasma measurements obtained by Cluster-C1, we surveyed the LMHs in the solar wind at 1 AU. In total 567 …