Search Publications
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…
An isolated, bright cusp aurora at Saturn
Baines, K. H.; Dougherty, M. K.; Gray, R. L. +16 more
Saturn's dayside aurora displays a number of morphological features poleward of the main emission region. We present an unusual morphology captured by the Hubble Space Telescope on 14 June 2014 (day 165), where for 2 h, Saturn's FUV aurora faded almost entirely, with the exception of a distinct emission spot at high latitude. The spot remained fix…
27 August 2001 substorm: Preonset phenomena, two main onsets, field-aligned current systems, and plasma flow channels in the ionosphere and in the magnetosphere
Moiseev, A. V.; Wang, J. Y.; Mishin, V. M. +2 more
We supplement the results of the 27 August 2001 substorm studied earlier in the series of papers. Described is the plasma flow in the nightside ionosphere from the near-polar region from the polar cap to the auroral oval during the substorm preonset phase and two expansion onsets, EO1 and EO2, produced by reconnection in the closed tail (magnetic …
A method to predict magnetopause expansion in radial IMF events by MHD simulations
Å afránková, J.; Němeček, Z.; Sibeck, D. G. +2 more
This paper presents a method for taking into account changes of solar wind parameters in the foreshock using global MHD simulations. We simulate four events with very distant subsolar magnetopause crossings that occurred during quasi-radial interplanetary magnetic field (IMF) intervals lasting from one to several hours. Using previous statistical …
Influence of the Ambient Electric Field on Measurements of the Actively Controlled Spacecraft Potential by MMS
Andriopoulou, M.; Nakamura, R.; Torbert, R. B. +5 more
Space missions with sophisticated plasma instrumentation such as Magnetospheric Multiscale, which employs four satellites to explore near-Earth space benefit from a low electric potential of the spacecraft, to improve the plasma measurements and therefore carry instruments to actively control the potential by means of ion beams. Without control, t…