Search Publications
Simulation of VLF chorus emissions in the magnetosphere and comparison with THEMIS spacecraft data
Santolík, O.; Demekhov, A. G.; Taubenschuss, U.
We present results of numerical simulations of VLF chorus emissions based on the backward wave oscillator model and compare them with Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft data from the equatorial chorus source region on the early morning side at a radial distance of 6 Earth radii. Specific attenti…
Solar wind- and EUV-dependent models for the shapes of the Martian plasma boundaries based on Mars Express measurements
Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +1 more
The long operational life (2003-present) of Mars Express (MEX) has allowed the spacecraft to make plasma measurements in the Martian environment over a wide range of upstream conditions. We have analyzed ∼7000 MEX orbits, covering three orders of magnitude in solar wind dynamic pressure, with data from the on board Analyzer of Space Plasmas and En…
On the Dawn-Dusk Asymmetry of the Kelvin-Helmholtz Instability Between 2007 and 2013
Nykyri, K.; Moore, T. W.; Dimmock, A. P. +2 more
Using data from Time History of Events and Macroscale Interactions during Substorms (THEMIS), a statistical study was performed to determine whether a dawn-dusk asymmetry exists in the occurrence rates of the Kelvin-Helmholtz instability during Parker-Spiral (PS) and Ortho-Parker-Spiral (OPS) orientations of the interplanetary magnetic field (IMF)…
Timescales for the penetration of IMF By into the Earth's magnetotail
Milan, S. E.; Fear, R. C.; Grocott, A. +1 more
Previous studies have shown that there is a correlation between the By component of the interplanetary magnetic field (IMF) and the By component observed in the magnetotail lobe and in the plasma sheet. However, studies of the effect of IMF By on several magnetospheric processes have indicated that the By
Traveling Foreshocks and Transient Foreshock Phenomena
Omidi, N.; Blanco-Cano, X.; Kajdič, P. +3 more
We use the multispacecraft capabilities of the Cluster and Time History of Events and Macroscale Interactions during Substorms (THEMIS) missions to show that two types of foreshock may be detected in spacecraft data. One is the global foreshock that appears upstream of the Earth's quasi-parallel bow shock under steady or variable interplanetary ma…
The MMS Dayside Magnetic Reconnection Locations During Phase 1 and Their Relation to the Predictions of the Maximum Magnetic Shear Model
Russell, C. T.; Fuselier, S. A.; Strangeway, R. J. +12 more
Several studies have validated the accuracy of the maximum magnetic shear model to predict the location of the reconnection site at the dayside magnetopause. These studies found agreement between model and observations for 74% to 88% of events examined. It should be noted that, of the anomalous events that failed the prediction of the model, 72% s…
Radial and local time structure of the Saturnian ring current, revealed by Cassini
Krupp, N.; Dougherty, M. K.; Thomsen, M. F. +6 more
We analyze particle and magnetic field data obtained between July 2004 and December 2013 in the equatorial magnetosphere of Saturn, by the Cassini spacecraft. The radial and local time distribution of the total (thermal and suprathermal) particle pressure and total plasma beta (ratio of particle to magnetic pressure) over radial distances from 5 t…
Comparative study of the Martian suprathermal electron depletions based on Mars Global Surveyor, Mars Express, and Mars Atmosphere and Volatile EvolutioN mission observations
André, N.; Fedorov, A.; Sauvaud, J. -A. +16 more
Nightside suprathermal electron depletions have been observed at Mars by three spacecraft to date: Mars Global Surveyor, Mars Express, and the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. This spatial and temporal diversity of measurements allows us to propose here a comprehensive view of the Martian electron depletions through the firs…
Occurrence rate of whistler waves in the magnetotail reconnection region
Sahraoui, F.; Deng, X. H.; Huang, S. Y. +9 more
It has long been suggested that whistler waves play an active role during magnetic reconnection. However, all previous observations were based on case studies and could not give a detailed picture as to where the whistler waves occur in the reconnection region. In this paper, a statistical study by using the Cluster data is performed to investigat…
Reformation of rippled quasi-parallel shocks: 2-D hybrid simulations
Wang, Shui; Huang, Can; Hao, Yufei +3 more
One-dimensional (1-D) hybrid simulations have demonstrated that a quasi-parallel shock is nonstationary and undergoes a reformation process. Recently, two-dimensional (2-D) hybrid simulations have revealed that ripples along the shock front is an inherent property of a quasi-parallel shock. In this paper, we investigate reformation process of a ri…