Search Publications
Right-handed circularly polarized dispersive Alfvén wave: Localization and turbulence in solar wind
Sharma, R. P.; Gaur, Nidhi; Sharma, Swati
The elucidation of the turbulent spectrum in the solar wind region in the dispersive range of scales is not yet completely established. The observational analysis of many spacecraft report that the fluctuations on the order of (or smaller scales) proton inertial length λi = c/ω p i show disparity with respect to the large-sca…
Whistlers observed outside the plasmasphere: Correlation to plasmaspheric/plasmapause features
Gallagher, D. L.; Adrian, M. L.; Fung, S. F. +1 more
Whistlers observed outside the plasmasphere by Cluster have been correlated with the global plasmasphere using Imager for Magnetopause-to-Aurora Global Exploration-Extreme Ultraviolet Imager (IMAGE-EUV) observations. Of the 12 Cluster-observed whistler events reported, EUV is able to provide global imaging of the plasmasphere for every event and d…
On the resolution of the phase space density required to obtain a specified accuracy of the solar wind bulk velocity
Podesta, John J.
Plasma measurements with significantly improved accuracy and time resolution are needed to advance knowledge and understanding of plasma physical process in the magnetosphere and the solar wind. In this study, it is shown how small unresolved features in particle distribution functions can have significant impacts on the measurement of plasma bulk…
The nonlinear evolution of kinetic Alfvén wave with the ion acoustic wave and turbulent spectrum in the magnetopause region
Sharma, R. P.; Yadav, N.; Rinawa, M. L. +1 more
The mutual nonlinear interplay of kinetic Alfvén wave (KAW) and ion acoustic wave, for the high-β plasma (i.e., me/mi ≪ β ≪ 1, where β is thermal to magnetic pressure ratio) in the magnetopause, has been considered in the present study. A set of dimensionless nonlinear Schrödinger equations has been derived taking into accoun…
Can ring current stabilize magnetotail during steady magnetospheric convection?
Ganushkina, N.; Dubyagin, S.; Liemohn, M. +1 more
The present study investigates the role of the ring current in stabilizing the magnetotail during steady magnetospheric convection (SMC) events. We develop a method for estimation of the symmetric ring current intensity from the single spacecraft magnetic field observations. The method is applied to a large number of SMC events identified using th…
Interpreting Ulysses data using inverse scattering theory: Oblique Alfvén waves
Wheeler, Harry R.; Reynolds, M. A.; Hamilton, R. L.
Solitary wave structures observed by the Ulysses spacecraft in the solar wind were analyzed using both inverse scattering theory and direct numerical integration of the derivative nonlinear Schrödinger (DNLS) equation. Several of these structures were found to be consistent with soliton solutions of the DNLS equation. Such solitary structures have…
Reply to the comment by Cowley et al. on "Magnetic phase structure of Saturn's 10.7 h oscillations"
Dougherty, M. K.; Yates, J. N.; Southwood, D. J.
Deflected propagation of a coronal mass ejection from the corona to interplanetary space
Wang, Yuming; Shen, Fang; Shen, Chenglong +2 more
Among various factors affecting the space weather effects of a coronal mass ejection (CME), its propagation trajectory in the interplanetary space is an important one determining whether and when the CME will hit the Earth. Many direct observations have revealed that a CME may not propagate along a straight trajectory in the corona, but whether or…
Consequences of geomagnetic activity on energization and loss of radiation belt electrons by oblique chorus waves
Krasnoselskikh, V.; Artemyev, A. V.; Agapitov, O. V. +1 more
Statistics of amplitudes and obliquity of lower band chorus whistler mode waves have been obtained from Cluster measurements in Earth's outer radiation belt and fitted as functions of L, latitude, magnetic local time, and three geomagnetic activity ranges for Dst∈[+10,-80] nT. Very oblique chorus waves have generally a much smaller average intensi…
Field-aligned currents in Saturn's southern nightside magnetosphere: Subcorotation and planetary period oscillation components
Coates, A. J.; Dougherty, M. K.; Alexeev, I. I. +6 more
We investigate magnetic data showing the presence of field-aligned magnetosphere-ionosphere coupling currents on 31 Cassini passes across Saturn's southern postmidnight auroral region. The currents are strongly modulated in magnitude, form, and position by the phase of the southern planetary period oscillations (PPOs). PPO-independent currents are…