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Global ULF waves generated by a hot flow anomaly
Zhao, L. L.; Zhang, H.; Zong, Q. G.
Hot flow anomalies (HFAs), which are frequently observed near Earth's bow shock, are phenomena resulting from the interaction between interplanetary discontinuities and Earth's bow shock. Such transient phenomena upstream the bow shock can cause significant deformation of the bow shock and the magnetosphere, generating traveling convection vortice…
Transient brightening of Jupiter's aurora observed by the Hisaki satellite and Hubble Space Telescope during approach phase of the Juno spacecraft
Fujimoto, M.; Yoshioka, K.; Gray, R. L. +11 more
In early 2014, continuous monitoring with the Hisaki satellite discovered transient auroral emission at Jupiter during a period when the solar wind was relatively quiet for a few days. Simultaneous imaging made by the Hubble Space Telescope (HST) suggested that the transient aurora is associated with a global magnetospheric disturbance that spans …
Rosetta measurements of lower hybrid frequency range electric field oscillations in the plasma environment of comet 67P
Nilsson, H.; André, M.; Karlsson, T. +6 more
Electric field measurements from cometary environments are very rare but can provide important information on how plasma waves help fashion the plasma environment. The long dwelling time of the Rosetta spacecraft close to comet 67P/Churyumov-Gerasimenko promises to improve this state. We here present the first electric field measurements from 67P,…
Quasilinear analysis of saturation properties of broadband whistler mode waves
Chen, L.; Liu, X.; Wang, S. +2 more
Saturation properties of parallel propagating broadband whistler mode waves are investigated using quasilinear theory. By assuming that the electron distribution stays bi-Maxwellian, we combine the previously obtained energy equation of quasilinear theory with wave equation to self-consistently model the excitation of broadband whistler waves. The…
Jupiter cloud morphology and zonal winds from ground-based observations before and during Juno's first perijove
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +8 more
We analyze Jupiter observations between December 2015 and August 2016 in the 0.38-1.7 µm wavelength range from the PlanetCam instrument at the 2.2 m telescope at Calar Alto Observatory and in the optical range by amateur observers contributing to the Planetary Virtual Observatory Laboratory. Over this time Jupiter was in a quiescent state wi…
Ion hole formation and nonlinear generation of electromagnetic ion cyclotron waves: THEMIS observations
Miyoshi, Yoshizumi; Kasahara, Satoshi; Asamura, Kazushi +6 more
Electromagnetic plasma waves are thought to be responsible for energy exchange between charged particles in space plasmas. Such an energy exchange process is evidenced by phase space holes identified in the ion distribution function and measurements of the dot product of the plasma wave electric field and the ion velocity. We develop a method to i…
Investigation of diurnal variability of water vapor in Enceladus' plume by the Cassini ultraviolet imaging spectrograph
Hansen, C. J.; Hendrix, A. R.; Portyankina, G. +4 more
An occultation of ɛ Orionis by Enceladus' plume was observed with Enceladus at an orbital longitude near apoapsis in order to investigate whether water vapor flow is modulated diurnally, similar to ice particles. The occultation showed that the bulk water vapor emanating from Enceladus changes little with orbital position. The amount of gas in at …
Mars Under Primordial Solar Wind Conditions: Mars Express Observations of the Strongest CME Detected at Mars Under Solar Cycle #24 and its Impact on Atmospheric Ion Escape
Barabash, Stas; Nilsson, Hans; Holmström, Mats +3 more
An extremely strong Coronal Mass Ejection (CME) impacted Mars on 12 July 2011, while the Mars Express spacecraft was present inside the nightside ionosphere. Estimated solar wind density and speed during the event are 39 particles cm-3 and 730 km/s, corresponding to nominal solar wind flux at Mars when the solar system was ∼1.1 Ga old. …
Redetection of the Ionospheric H3+ Signature of Saturn's "Ring Rain"
Baines, Kevin H.; O'Donoghue, James; Moore, Luke +4 more
In April 2011 Saturn's midlatitude ionospheric H3+ emissions were detected, exhibiting anomalous (nonsolar) H3+ latitudinal variations consistent with the transport of water from specific locations in Saturn's rings, known as "ring rain". These products, transported to the planet along the magnetic field, may help to explain the unusual pattern of…
Dynamic response of the Martian ionosphere to an interplanetary shock: Mars Express and MAVEN observations
Gurnett, D. A.; Halekas, J. S.; Kopf, A. J. +10 more
Multipoint observations from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument on board Mars Express and the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission reveal a dynamic response of the Martian ionosphere to abrupt variations in the upstream solar wind plasma. On 2 February 2017, MAVEN, located upstream …