Search Publications
Multi-instrument observation of simultaneous polar cap auroras on open and closed magnetic field lines
Lester, M.; Fear, R. C.; Zhang, Y. +5 more
This paper presents observations of polar cap auroral features on 19 January 2008, evaluated using multiple instruments with near-simultaneous observations in both hemispheres. Analysis of the features indicates that there are at least two formation mechanisms/types of polar cap aurora occurring simultaneously on different magnetic field topologie…
Current sheets in comet 67P/Churyumov-Gerasimenko's coma
Coates, A. J.; Jones, G. H.; Glassmeier, K. -H. +16 more
The Rosetta Plasma Consortium (RPC) data are used to investigate the presence of current sheets in the coma of comet 67P/Churyumov-Gerasimenko. The interaction of the interplanetary magnetic field (IMF) transported by the solar wind toward the outgassing comet consists amongst others of mass loading and field line draping near the nucleus. The dra…
Coronal mass ejections and solar wind mass fluxes over the heliosphere during solar cycles 23 and 24 (1996-2014)
Lamy, P.; Quémerais, E.; Floyd, O. +2 more
Coronal mass ejections (CMEs) play a major role in the heliosphere, and their contribution to the solar wind mass flux, already considered in the Skylab and Solwind eras with conflicting results, is reexamined in the light of 19 years (1996-2014) of SOHO observations with the Large Angle and Spectroscopic Coronagraph (LASCO-C2) for the CMEs and ex…
Coherently modulated whistler mode waves simultaneously observed over unexpectedly large spatial scales
Ma, Qianli; Li, Jinxing; Kletzing, Craig A. +10 more
Utilizing simultaneous twin Van Allen Probes observations of whistler mode waves at variable separations, we are able to distinguish the temporal variations from spatial variations, determine the coherence spatial scale, and suggest the possible mechanism of wave modulation. The two probes observed coherently modulated whistler mode waves simultan…
Oxygen Ions O+ Energized by Kinetic Alfvén Eigenmode During Dipolarizations of Intense Substorms
Dandouras, I.; André, M.; Reme, H. +7 more
Singly charged oxygen ions, O+, energized by kinetic Alfvén wave eigenmode (KAWE) in the plasma sheet boundary layer during dipolarizations of two intense substorms, 10:07 UT on 31 August 2004 and 18:24 UT on 14 September 2004, are investigated by Cluster spacecraft in the magnetotail. It is found that after the beginning of the expansi…
Beaming of intense AKR seen from the Interball-2 spacecraft
Panchenko, M.; Mutel, R.; Christopher, I. +2 more
We present results of intense auroral kilometric radiation (AKR) sources direction finding based on single-spacecraft k→ vector source location performed in the frame of Interball-2 mission (POLRAD experiment on board Auroral Probe). With our swept frequency analyzer we are not able to work with single AKR bursts generated in small, elementary sou…
Implications of MAVEN's planetographic coordinate system for comparisons to other recent Mars orbital missions
Withers, Paul; Jakosky, B. M.
The Mars Atmosphere and Volatile EvolutioN (MAVEN) mission uses a planetographic coordinate system to report altitude, latitude, and longitude on Mars. By contrast, Mars Global Surveyor, Mars Odyssey, Mars Express, and Mars Reconnaissance Orbiter generally used a planetocentric coordinate system. These two coordinate systems are different: latitud…
Density Structures, Dynamics, and Seasonal and Solar Cycle Modulations of Saturn's Inner Plasma Disk
André, N.; Persoon, A. M.; Garnier, P. +7 more
We present statistical results from the Cassini Radio and Plasma Wave Science (RPWS) Langmuir probe measurements recorded during the time interval from orbit 3 (1 February 2005) to 237 (29 June 2016). A new and improved data analysis method to obtain ion density from the Cassini LP measurements is used to study the asymmetries and modulations foun…
Asymmetries in the Magnetosheath Field Draping on Venus' Nightside
Volwerk, M.; Bertucci, C.; Delva, M. +1 more
Draping features of the interplanetary magnetic field around nonmagnetic bodies, especially Venus, have been studied in detail in numerical simulations and also from observations. Existing analytical and numerical work for nonperpendicular interplanetary magnetic field and solar wind velocity direction show a kink in the draped fieldlines in the n…
Shock aurora: Field-aligned discrete structures moving along the dawnside oval
Zhou, Xiaoyan; Haerendel, Gerhard; Moen, Jøran I. +5 more
Generated by interplanetary shocks or solar wind pressure pulses, shock aurora has transient, global, and dynamic significances and provides a direct manifestation of the solar wind-magnetosphere-ionosphere interaction. As a part of a series of studies of the shock aurora, this paper focuses on the interaction at the morning magnetopause and its a…