Search Publications
Five populations of interplanetary meteoroids
Divine, Neil
A description of the interplanetary meteoroid environment is proposed in terms of distinct populations, each of which has separable distributions in particle mass and in orbital inclination, eccentricity, and perihelion distance. This treatment leads to expressions for particle concentration and flux which explicitly incorporate both Keplerian dyn…
A survey of low frequency waves at Jupiter: The Ulysses encounter
Tsurutani, Bruce T.; Smith, Edward J.; Balogh, Andre +1 more
We report the results of a survey of low-frequency (LF) plasma waves detected during the Ulysses Jupiter flyby. In the Jovian foreshock, two predominant wave periods are detected: 102-s and 5-s, as measured in the spacecraft frame. The 102-s waves are highly nonlinear propagate at large angles to B\searrow0 (typica…
Detection of the local interstellar cloud from high-resolution spectra of nearby stars: Inferences on the heliospheric interface
Ferlet, R.; Vidal-Madjar, A.; Lallement, R. +1 more
High-resolution spectroscopic observations of the local interstellar medium between the Sun and nearby stars have been recorded with the Aurelie spectrometer of the Observatoire de Haute Provence (France). They have been used to identify and characterize the local interstellar cloud (LIC) in which the Sun is embedded. The ``Doppler triangulation''…
Low-frequency electromagnetic plasma waves at comet P/Grigg-Skjellerup: Overview and spectral characteristics
Neubauer, Fritz M.; Glassmeier, Karl-Heinz
Large-amplitude electromagnetic plasma waves are one of the dominant features of the solar wind-comet interaction. Wave characteristics strongly depend on parameters such as the solar wind flow and Alfvén velocities and the angle between flow and interplanetary magnetic field as well as the production rate. With respect to the latter the flyby of …
Mirror modes and fast magnetoacoustic waves near the magnetic pileup boundary of comet P/Halley
Motschmann, Uwe; Neubauer, Fritz M.; Fuselier, S. A. +4 more
Large-amplitude ultralow-frequency wave structures observed on both sides of the magnetic pileup boundary of comet P/Halley during the flyby of the Giotto spacecraft have been analyzed using suprathermal electron density and magnetic field observations. Upstream of the boundary, electron density and magnetic field magnitude variations are anticorr…
Velocity space diffusion and nongyrotropy of pickup water group ions at comet Grigg-Skjellerup
Coates, A. J.; Neubauer, Fritz M.; Wilken, B. +1 more
The diffusion of water group cometary ions in velocity space at comet Grigg-Skjellerup was measured during the Giotto spacecraft encounter. The evolution of the collapsed pitch angle and energy distributions during the inbound and outbound passes shows that the timescale for energy diffusion may be similar to that for pitch angle diffusion. Fully …
Morphology and time variation of the Jovian far UV aurora: Hubble Space Telescope observations
Paresce, Francesco; Prange, Renee; Gerard, Jean-Claude +1 more
High spatial resolution images of the north polar region of Jupiter have been obtained with the Faint Object Camera on board the Hubble Space Telescope. The first set of two images collected 87 min apart in February 1992 shows a bright (≃180 kR) emission superimposed on the background in rotation with the planet. Both Ly α images show common regio…
The dusty ballerina skirt of Jupiter
Horanyi, M.; Gruen, E.; Morfill, G.
We suggest a model to explain the unexpected recurrent dust events that were observed during the Jupiter encounter by the dust detector on board the Ulysses spacecraft. This model is based on dust-magnetosphere interactions. Dust particles inside the Jovian magnetosphere collect electrostatic charges and their interaction with the magnetic and ele…
Bernstein waves in the Io plasma torus: A novel kind of electron temperature sensor
Moncuquet, Michel; Meyer-Vernet, Nicole; Hoang, Sang
During Ulysses passage through the Io plasma torus, along a basically north-to-south trajectory crossing the magnetic equator at R~7.8 RJ from Jupiter, the Unified Radio and Plasma Wave experiment observed weakly banded emissions with well-defined minima at gyroharmonics. These noise bands are interpreted as stable electrostatic fluctua…
Correlated variations of UV and radio emissions during an outstanding Jovian auroral event
Moos, H. W.; Bame, S. J.; Zarka, P. +6 more
An exceptional Jovian aurora was detected in the FUV on December 21, 1990, by means of Vilspa and Goddard Space Flight Center (GFSC) International Ultraviolet Explorer (IUE) observations. This event included intensification by a factor of three between December 20 and 21, leading to the brightest aurora identified in the IUE data analyzed, and, in…