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Direct Measurement of Low-Energy Electron Foreshock Beams
Soucek, Jan; Píša, David; Santolík, Ondrej
Electrostatic plasma waves above and below the local electron plasma frequency represent a characteristic feature of the foreshock region. These waves are known to be generated by electron beams originating from the bow shock and their spectrum varies from narrowband intense waves close to foreshock edge to weaker broadband emissions further downs…
Machine Learning Analysis of Jupiter's Far-Ultraviolet Auroral Morphology
Milan, S. E.; Nichols, J. D.; Kamran, A.
We present the first principal component analysis of Jupiter's far-ultraviolet auroras, in order to identify the most repeatable sources of variation in the auroral morphology. We show that the most recurrent source of variance is emission just poleward of the statistical oval on the dawnside. Further significant repeatable sources of variance are…
Solar Wind Dynamic Pressure Upstream From Saturn: Estimation From Magnetosheath Properties and Comparison With SKR
Thomsen, M. F.; Jackman, C. M.; Lamy, L.
An analytical method is developed by which measurements made by the Cassini spacecraft in Saturn's magnetosheath can be used to infer the upstream solar wind parameters, specifically the solar wind speed (Vsw) and the dynamic pressure (Pd). The method is validated by comparing the results with other estimates of these parameters, includ…
Variability of Precipitating Ion Fluxes During the September 2017 Event at Mars
Holmström, M.; Leblanc, F.; Luhmann, J. +15 more
In this work, we study the influence of the September 2017 solar event on the precipitating heavy ion fluxes toward Mars' atmosphere as seen by Mars Atmosphere and Volatile EvolutioN/Solar Wind Ion Analyzer, an energy and angular ion spectrometer and by Mars Atmosphere and Volatile EvolutioN/Suprathermal and Thermal Ion Composition instrument, an …
Survey of Saturn Whistler Mode Hiss Intensity
Kurth, W. S.; Averkamp, T. F.; Menietti, J. D.
We have conducted an extensive survey of whistler mode hiss emission at Saturn using nearly the complete data set from the Cassini Radio and Plasma Wave Science investigation. We distinguish the hiss emission by frequency and intensity threshold criteria. The survey includes all longitudes and latitudes >25° for r < 10 RS, limited…
Currents Associated With Saturn's Intra-D Ring Azimuthal Field Perturbations
Dougherty, M. K.; Cowley, S. W. H.; Bunce, E. J. +4 more
During the final 22 full revolutions of the Cassini mission in 2017, the spacecraft passed at periapsis near the noon meridian through the gap between the inner edge of Saturn's D ring and the denser layers of the planet's atmosphere, revealing the presence of an unanticipated low-latitude current system via the associated azimuthal perturbation f…
Heavy Ion Flows in the Upper Ionosphere of the Venusian North Pole
Fedorov, A.; Barabash, S.; Futaana, Y. +5 more
We investigate the heavy ion density and velocity in the Venusian upper ionosphere near the North Pole, using the Ion Mass Analyzer, a part of the Analyzer of Space Plasmas and Energetic Atoms 4, together with the magnetic field instruments on Venus Express. The measurements were made during June-July 2014, covering the aerobraking campaign with l…
Current Density in Saturn's Equatorial Current Sheet: Cassini Magnetometer Observations
Arridge, C. S.; Martin, C. J.
The equatorial current sheet at Saturn is the result of a rapidly rotating magnetosphere. The sheet itself exhibits periodic seasonal and diurnal movements as well as aperiodic movements of a currently unknown origin, along with periodic thickening and thinning of the magnetodisc, and azimuthal changes in the thickness due to local effects in the …
Multispacecraft Study of the Interaction Between an Interplanetary Shock and a Solar Wind Flux Rope
Burgess, D.; Blanco-Cano, X.; Kajdič, P. +1 more
Interplanetary (IP) shocks are driven in the heliosphere by fast coronal ejecta, they can accelerate particles and are associated with solar energetic particle and energetic storm particle events. IP shocks can interact with structures in the solar wind and with magnetospheres. We show how the properties of an IP shock change when it interacts wit…
Kelvin-Helmholtz Waves Magnetic Curvature and Vorticity: Four-Spacecraft Cluster Observations
Kieokaew, Rungployphan; Foullon, Claire
[1] Magnetopause Kelvin-Helmholtz (KH) waves are rich in complex magnetic and flow structures which are key to understand the role of these waves in facilitating the solar wind plasma transport into the Earth's magnetosphere. Four spacecraft in tetrahedral configuration provide the tools necessary for characterizing in situ magnetic geometry and v…