Search Publications
Observations of electron vorticity in the inner plasma sheet
Fazakerley, A. N.; Gurgiolo, C.; Goldstein, M. L. +2 more
From a limited number of observations it appears that vorticity is a common feature in the inner plasma sheet. With the four Cluster spacecraft and the four PEACE instruments positioned in a tetrahedral configuration, for the first time it is possible to directly estimate the electron fluid vorticity in a space plasma. We show examples of electron…
THEMIS observations of double-onset substorms and their association with IMF variations
Russell, C. T.; Glassmeier, K. -H.; Baumjohann, W. +3 more
On 16 July 2008, two pairs of consecutive bursts of Pi2 pulsations were recorded simultaneously across the THEMIS ground-based observatory system. Wavelet transformation reveals that for each high-latitude pair, the dominant frequency of the first burst is higher than that of the second. But at low latitudes, the dominant frequency does not change…
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.