Search Publications
Shock normal determination for multiple-ion shocks
Coates, A. J.; Neubauer, F. M.; Motschmann, U. +1 more
We have adapted the single-ion Viñas and Scudder (1986) solution to the Rankine-Hugoniot problem to a multiple-ion solution. Using this technique, we can calculate a shock normal direction, shock speed, best estimate of the upstream and downstream magnetic field and plasma asymptotic states, and θBn, the angle between the shock normal a…
The structure of mass-loading shocks. 1. Comets
Neubauer, F. M.; Zank, G. P.; Story, T. R.
A new multifluid model to describe the solar wind-cometary ion plasma in the outer cometary coma is derived. This model is distinguished from previous multifluid models in that wave-particle effects are included explicitly. By considering hydrodynamic timescales, self-consistent dissipative terms (which correspond to the spatial diffusion of comet…
Giotto ion mass spectrometer measurements at comet P/Grigg-Skjellerup
Altwegg, K.; Balsiger, H.; Neubauer, F. M. +6 more
The Giotto ion mass spectrometer high-intensity spectrometer (IMS-HIS) measured fluxes of ions from about 260,000 km before (1008:36 UT spacecraft time) to about 86,000 km after (1701:33 UT spacecraft time) closest approach to comet P/Grigg-Skjellerup during the encounter on July 10, 1992. Although the HIS sensor was not designed to measure proton…
Whistler mode waves in the Jovian magnetosheath
Tsurutani, B. T.; Lin, Naiguo; Kellogg, P. J. +3 more
During the Ulysses flyby of Jupiter in February 1992, the spacecraft transversed the Jovian magnetosheath for a few hours during the inbound pass and for a few days during the outbound pass. Burstlike electromagnetic waves at frequencies of ~0.1-0.4 of the local electron cyclotron frequency have been observed by the Unified Radio and Plasma Wave (…
A new component of Jovian kilometric radio emission
Stone, R. G.; Fainberg, J.; Reiner, M. J.
Evidence is presented for a new Jovian radio emission component in the frequency range from ~40 to ~200 kHz observed during the Ulysses-Jupiter outbound pass at high Jovian southern latitudes along the dusk terminator. The new radio component (referred to as sKOM) occurs in the same frequency range as the observed broadband kilometric (bKOM) radio…
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…