Search Publications
Enhancement of oxygen in the magnetic island associated with dipolarization fronts
Cao, J. B.; Fu, H. S.; Liu, W. L. +2 more
A significant enhancement of O+ is observed by Cluster inside an earthward propagating magnetic island behind a dipolarization front (DF). Such enhancement, from 0.005 to 0.03 cm-3, makes the O+ flux inside the magnetic island 20 times larger than that outside the magnetic island. In the meantime, the H+…
A new solar wind-driven global dynamic plasmapause model: 2. Model and validation
Gallagher, Dennis L.; He, Fei; Liemohn, Mike W. +5 more
A new solar wind-driven global dynamic plasmapause (NSW-GDP) model has been constructed based on the largest currently available database containing 49,119 plasmapause crossing locations and 3957 plasmapause profiles (corresponding to 48,899 plasmapause locations), from 18 satellites during 1977-2015 covering four solar cycles. This model is compi…
Io plasma torus ion composition: Voyager, Galileo, and Cassini
Steffl, Andrew J.; Bagenal, Fran; Nerney, Edward G.
The Io torus produces ultraviolet emissions diagnostic of plasma conditions. We revisit data sets obtained by the Voyager 1, Galileo, and Cassini missions at Jupiter. With the latest version (8.0) of the CHIANTI atomic database we analyze UV spectra to determine ion composition. We compare ion composition obtained from observations from these thre…
The Warm Plasma Composition in the Inner Magnetosphere During 2012-2015
Spence, H. E.; Skoug, R. M.; Goldstein, J. +4 more
Ionospheric heavy ions play an important role in the dynamics of Earth's magnetosphere. The greater mass and gyroradius of ionospheric oxygen differentiates its behavior from protons at the same energies. Oxygen may have an impact on tail reconnection processes, and it can at least temporarily dominate the energy content of the ring current during…
Seasonal Changes in Hydrogen Escape From Mars Through Analysis of HST Observations of the Martian Exosphere Near Perihelion
Villanueva, G. L.; Bertaux, J. L.; Clarke, J. T. +5 more
Hubble Space Telescope (HST) observations of the Martian hydrogen exosphere in Lyman α are presented in this paper for a period when Mars passed perihelion and southern summer solstice in its orbit. The peak intensity in the exospheric Lyman α brightness was recorded after Mars went past its perihelion, slightly after southern summer solstice. The…
Ion-Scale Wave Properties and Enhanced Ion Heating Across the Low-Latitude Boundary Layer During Kelvin-Helmholtz Instability
Nykyri, K.; Moore, T. W.; Dimmock, A. P.
In the Earth's magnetosphere, the magnetotail plasma sheet ions are much hotter than in the shocked solar wind. On the dawn sector, the cold-component ions are more abundant and hotter by 30-40% when compared to the dusk sector. Recent statistical studies of the flank magnetopause and magnetosheath have shown that the level of temperature asymmetr…
Comparing and contrasting dispersionless injections at geosynchronous orbit during a substorm event
Daly, P. W.; Khotyaintsev, Y.; Kozak, L. +3 more
Particle injections in the magnetosphere transport electrons and ions from the magnetotail to the radiation belts. Here we consider generation mechanisms of "dispersionless" injections, namely, those with simultaneous increase of the particle flux over a wide energy range. In this study we take advantage of multisatellite observations which simult…
North-south asymmetries in cold plasma density in the magnetotail lobes: Cluster observations
Snekvik, K.; Østgaard, N.; Tenfjord, P. +7 more
In this paper, we present observations of cold (0-70 eV) plasma density in the magnetotail lobes. The observations and results are based on 16 years of Cluster observation of spacecraft potential measurements converted into local plasma densities. Measurements from all four Cluster spacecraft have been used, and the survey indicates a persistent a…
A multispacecraft event study of Pc5 ultralow-frequency waves in the magnetosphere and their external drivers
Wang, Chih-Ping; Liu, Terry Z.; Angelopoulos, Vassilis +9 more
We investigate a quiet time event of magnetospheric Pc5 ultralow-frequency (ULF) waves and their likely external drivers using multiple spacecraft observations. Enhancements of electric and magnetic field perturbations in two narrow frequency bands, 1.5-2 mHz and 3.5-4 mHz, were observed over a large radial distance range from r 5 to 11 RE
A new solar wind-driven global dynamic plasmapause model: 1. Database and statistics
Liemohn, Michael W.; Gallagher, Dennis L.; He, Fei +5 more
A large database, possibly the largest plasmapause location database, with 49,119 plasmapause crossing events from the in situ observations and 3957 plasmapause profiles (corresponding to 48,899 plasmapause locations in 1 h magnetic local time (MLT) intervals) from optical remote sensing from 1977 to 2015 by 18 satellites is compiled. The response…