Search Publications
Electromagnetic ion cyclotron waves in the Earth's magnetosphere with a kappa-Maxwellian particle distribution
Omura, Yoshiharu; Summers, Danny; Shoji, Masafumi +3 more
A theoretical model to study electromagnetic ion cyclotron (EMIC) waves in kappa-Maxwellian plasma is developed. The plasma is assumed to have five components, i.e., electrons, cool and hot protons, and singly charged helium and oxygen ions. The kappa-Maxwellian anisotropic particle distribution function is assumed for the hot protons. We use the …
Asymmetric magnetic reconnection with a flow shear and applications to the magnetopause
Drake, J. F.; Eriksson, S.; Wilder, F. D. +3 more
We perform a systematic theoretical and numerical study of antiparallel two-dimensional magnetic reconnection with asymmetries in the plasma density and reconnecting magnetic field strength in addition to a bulk flow shear across the reconnection site in the plane of the reconnecting fields, which commonly occurs at planetary magnetospheres. We an…
Empirical model of lower band chorus wave distribution in the outer radiation belt
Krasnoselskikh, V.; Artemyev, A. V.; Agapitov, O. V. +2 more
Accurate modeling of wave-particle interactions in the radiation belts requires detailed information on wave amplitudes and wave-normal angular distributions over L shells, magnetic latitudes, magnetic local times, and for various geomagnetic activity conditions. In this work, we develop a new and comprehensive parametric model of VLF chorus waves…
Day-to-night transport in the Martian ionosphere: Implications from total electron content measurements
Wei, Y.; Galand, M.; Yelle, R. V. +2 more
The nightside Martian ionosphere is thought to be contributed by day-to-night transport and electron precipitation, of which the former has not been well studied. In this work, we evaluate the role of day-to-night transport based on the total electron content (TEC) measurements made by the Mars Advanced Radar for Subsurface and Ionospheric Soundin…
Interhemispheric differences in ionospheric convection: Cluster EDI observations revisited
Haaland, S.; Förster, M.
The interaction between the interplanetary magnetic field and the geomagnetic field sets up a large-scale circulation in the magnetosphere. This circulation is also reflected in the magnetically connected ionosphere. In this paper, we present a study of ionospheric convection based on Cluster Electron Drift Instrument (EDI) satellite measurements …
The flapping motion of the Venusian magnetotail: Venus Express observations
Barabash, S.; Futaana, Y.; Wei, Y. +7 more
With a newly developed technique and magnetic field measurements obtained by the magnetometer on Venus Express, we study the flapping motion of the Venusian magnetotail. We find that the flapping motion generally comprises contributions both from a nonpropagating steady flapping and a propagating kink-like flapping. The flapping motion tilts the c…
Concurrent observations of ultraviolet aurora and energetic electron precipitation with Mars Express
Lundin, R.; Bertaux, J. -L.; Gérard, J. -C. +4 more
The database of the Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) instrument between late January 2004 and Mars 2014 has been searched to identify signatures of CO Cameron and CO2+ doublet ultraviolet auroral emissions. This study has almost doubled the number of auroral detectio…
Outflow of low-energy ions and the solar cycle
André, M.; Eriksson, A. I.; Li, K.
Magnetospheric ions with energies less than tens of eV originate from the ionosphere. Positive low-energy ions are complicated to detect onboard sunlit spacecraft at higher altitudes, which often become positively charged to several tens of volts. We use two Cluster spacecraft and study low-energy ions with a technique based on the detection of th…
UV solar irradiance in observations and the NRLSSI and SATIRE-S models
Solanki, S. K.; Yeo, K. L.; Krivova, N. A. +3 more
Total solar irradiance and UV spectral solar irradiance has been monitored since 1978 through a succession of space missions. This is accompanied by the development of models aimed at replicating solar irradiance by relating the variability to solar magnetic activity. The Naval Research Laboratory Solar Spectral Irradiance (NRLSSI) and Spectral An…
Dependence of the dayside magnetopause reconnection rate on local conditions
Kistler, Lynn M.; Wang, Shan; Mouikis, Christopher G. +1 more
We estimate the reconnection rates for eight dayside magnetopause reconnection events observed by the Cluster spacecraft and compare them with the predictions of the Cassak-Shay Formula (Rcs) Cassak and Shay (2007). The measured reconnection rate is determined by calculating the product of the inflow velocity and magnetic field in the m…