Search Publications
Magnetic signatures of Kelvin-Helmholtz vortices on Saturn's magnetopause: Global survey
Wilson, R. J.; Delamere, P. A.; Bagenal, F. +1 more
Saturn's rapid rotation combined with relatively weak magnetic fields in the outer magnetosphere and sheath lead to conditions that are favorable for the Kelvin-Helmholtz (KH) instability. A Kelvin-Helmholtz unstable magnetopause boundary has important consequences for Saturn's interaction with the solar wind due to mass, momentum, and energy tran…
Quantitative comparison of methods for predicting the arrival of coronal mass ejections at Earth based on multiview imaging
Vourlidas, A.; Colaninno, R. C.; Wu, C. C.
We investigate the performance of six methods for predicting the coronal mass ejection (CME) time of arrival (ToA) and velocity at Earth using a sample of nine Earth-impacting CMEs between March 2010 and June 2011. The CMEs were tracked continuously from the Sun to near Earth in multiviewpoint imaging data from STEREO Sun-Earth Connection Coronal …
Multispectral simultaneous diagnosis of Saturn's aurorae throughout a planetary rotation
Lamy, L.; Badman, S. V.; Brandt, P. C. +6 more
From 27 to 28 January 2009, the Cassini spacecraft remotely acquired combined observations of Saturn's southern aurorae at radio, ultraviolet, and infrared wavelengths, while monitoring ion injections in the middle magnetosphere from energetic neutral atoms. Simultaneous measurements included the sampling of a full planetary rotation, a relevant t…
A new diffusion matrix for whistler mode chorus waves
Meredith, Nigel P.; Horne, Richard B.; Glauert, Sarah A. +5 more
Global models of the Van Allen radiation belts usually include resonant wave-particle interactions as a diffusion process, but there is a large uncertainty over the diffusion rates. Here we present a new diffusion matrix for whistler mode chorus waves that can be used in such models. Data from seven satellites are used to construct 3536 power spec…
Interaction of substorm injections with the subauroral geospace: 1. Multispacecraft observations of SAID
Mishin, Evgeny V.
Subauroral ion drifts (SAID) are the prominent feature of the active subauroral geospace, just earthward of the electron plasma sheet (PS) boundary in the premidnight sector. We explore magnetically conjugate satellite observations of substorm SAID near the magnetic equator and in the topside ionosphere confirming and expanding on our previous res…
Aurora on Ganymede
Saur, Joachim; Feldman, Paul D.; Strobel, Darrell F. +3 more
We present four sets of ultraviolet images of Ganymede acquired with the Hubble Space Telescope (HST) from 1998 to 2007, all of which show auroral emission from electron excited atomic oxygen. The three different hemispheres of Ganymede captured in the observations show strikingly different emission morphologies. Ultraviolet emission at 1356 Å is …
Current structures associated with dipolarization fronts
Zong, Q. -G.; Sun, W. J.; Shi, Q. Q. +8 more
observational results on currents around the dipolarization fronts (DFs) of earthward flow bursts have attracted much research attention. These currents are found to have close association with substorm intensifications. This paper devotes to further study of the current system ahead and within the DFs with high-resolution magnetic field measureme…
Conditions at the magnetopause of Saturn and implications for the solar wind interaction
Delamere, P. A.; Bagenal, F.; Desroche, M. +1 more
Using idealized models of the magnetosheath and magnetospheric magnetic fields, plasma densities, and plasma flow, we test for the steady state viability of processes mediating the interaction between the solar wind and the magnetosphere of Saturn. The magnetopause is modeled as an asymmetric paraboloid with a standoff distance of ∼25 RS
Triggering process of electromagnetic ion cyclotron rising tone emissions in the inner magnetosphere
Omura, Yoshiharu; Shoji, Masafumi
Spacecraft observations and simulations show generation of coherent electromagnetic ion cyclotron (EMIC) triggered emissions with rising tone frequencies. In the inner magnetosphere, the spontaneously triggered EMIC waves are generated by the energetic protons with large temperature anisotropy. We reproduced EMIC triggered emissions in the Earth's…
A global multispecies single-fluid MHD study of the plasma interaction around Venus
Russell, C. T.; Wei, H. Y.; Toth, G. +3 more
This paper reports a new global multispecies single-fluid MHD model that was recently developed for Venus. This model is similar to the numerical model that has been successfully applied to Mars. Mass densities of proton and three important ionospheric ion species (O+, O2+, and CO2+) are self-…