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''…
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…
Source characteristics of Jovian narrow-band kilometric radio emissions
Kaiser, M. L.; Desch, M. D.; Zarka, P. +5 more
New observations of Jovian narrow-bank kilometric (nKOM) radio emissions were made by the Unified Radio and Plasma Wave (URAP) experiment on the Ulysses spacecraft during the Ulysses-Jupiter encounter in early February 1992. These observations have demonstrated the unique capability of the URAP instrument for determining both the direction and pol…
Source characteristics of Jovian hectometric radio emissions
Stone, R. G.; Fainberg, J.; Reiner, M. J.
Direct confirmation that low-frequency Jovian hectometric (HOM) radio emissions centered near 0° central meridian longitude consist of distinct, oppositely polarized northern and southern beams has been achieved using data from the Unified Radio and Plasma Wave (URAP) experiment on the Ulysses spacecraft during the Ulysses-Jupiter encounter in ear…
Jovian electron propagation in three dimensions of the heliosphere: The Ulysses investigations
Balogh, A.; Smith, D. A.; Simpson, J. A. +1 more
We report investigations of Jovian relativistic electrons in the interplanetary medium that provide new insights into both the physical processes by which the Jovian magnetosphere releases its trapped relativistic electrons into the interplanetary medium, and the modes of their interplanetary propagation. These studies were dependent on the unique…
Time-variable magnetospheric radio emissions from Jupiter
Kaiser, M. L.
Jupiter is the source of a large number of independent nonthermal radio sources, all of which vary with time. The known causes of the variations include planetary rotation modulation, modulation by Io and/or its torus, and influence by the solar wind which can reach surprisingly deep into the Jovian magnetosphere. However, a significant number of …