Energetic Particles at Venus: Galileo Results

@article{Williams1991EnergeticPA,
  title={Energetic Particles at Venus: Galileo Results},
  author={D. J. Williams and Richard W. Mcentire and Stamatios M. Krimigis and Edmond C. Roelof and Stephen E. Jaskulek and B. E. Tossman and Berend Wilken and Wolfgang ST�DEMANN and Thomas P. Armstrong and Theodore A. Fritz and Louis J. Lanzerotti and Juan G. Roederer},
  journal={Science},
  year={1991},
  volume={253},
  pages={1525 - 1528}
}
At Venus the Energetic Particles Detector (EPD) on the Galileo spacecraft measured the differential energy spectra and angular distributions of ions >22 kiloelectron volts (keV) and electrons > 15 keV in energy. The only time particles were observed by EPD was in a series of episodic events [0546 to 0638 universal time (UT)] near closest approach (0559:03 UT). Angular distributions were highly anisotropic, ordered by the magnetic field, and showed ions arriving from the hemisphere containing… 

Plasma Observations at Venus with Galileo

Solar wind densities and bulk speeds were determined from the electron velocity distributions, and a search for pickup ions from the hot hydrogen and oxygen planetary coronas yielded an upper limit in the range of 10-3 ion per cubic centimeter, which is consistent with densities expected from current models of neutral gas densities.

Particle acceleration at the Sun and in the heliosphere

Energetic particles are accelerated in rich profusion at sites throughout the heliosphere. They come from solar flares in the low corona, from shock waves driven outward by coronal mass ejections

Fine structure of Langmuir waves observed upstream of the bow shock at Venus

Highly structured Langmuir waves, also known as electron plasma oscillations, have been observed in the foreshock of Venus using the plasma wave experiment on the Galileo spacecraft during the

Lightning and Plasma Wave Observations from the Galileo Flyby of Venus

During the Galileo flyby of Venus the plasma wave instrument was used to search for impulsive radio signals from lightning and to investigate locally generated plasma waves, which have considerable fine structure because of the formation of soliton-like wave packets.

Statistical imaging of the Venus foreshock using VLF wave emissions

Strong VLF wave emissions have been shown to be an intrinsic property of the Venus foreshock and foreshocks in general. In this work, we use these measured wave emissions to construct statistical

Ablation of Venusian oxygen ions by unshocked solar wind

The Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) on the New Horizons Mission

The Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) comprises the hardware and accompanying science investigation on the New Horizons spacecraft to measure pick-up ions from

Serendipitous science from flybys of secondary targets: Galileo at Venus, Earth, and asteroids; Ulysses at Jupiter

During this quadrennium, while the Voyager and Pioneer spacecraft moved through the outer heliosphere, ever further from the sun, the Ulysses and Galileo spacecraft were traversing the inner

Acceleration processes of heliospheric particle populations

Through space exploration an amazing variety of populations of energetic particles have been discovered in our Sun’s surroundings. Wherever we look in the heliosphere, we find processes that can

References

SHOWING 1-8 OF 8 REFERENCES

Plasma Observations at Venus with Galileo

Solar wind densities and bulk speeds were determined from the electron velocity distributions, and a search for pickup ions from the hot hydrogen and oxygen planetary coronas yielded an upper limit in the range of 10-3 ion per cubic centimeter, which is consistent with densities expected from current models of neutral gas densities.

Coupled hydromagnetic wave excitation and ion acceleration upstream of the earth's bow shock

We extend the Lee (1982) self-consistent theory of upstream wave excitation and particle energization to address observations by Voyager 2 of sunward propagating MHD waves and diffuse suprathermal

Suprathermal ions observed upstream of the Venus bow shock

Suprathermal ions with arrival directions quite distinct from those of the solar wind have been detected upstream of the Venus bow shock. We examine the possibility that these events could be caused

The Galileo Venus Encounter

Together with ground-based observations conducted during the Venus encounter, these observations have yielded more accurate information about the planet's plasma environment, cloud patterns, and the possible existence of lightning.

Computer modeling of test particle acceleration at oblique shocks

We review the basic techniques and results of numerical codes used to model the acceleration of charged particles at oblique, fast-mode, collisionless shocks. The emphasis is upon models in which

V

  • M. Vasyluinas, ibid., p.

Magnetic Field Studies of the Solar Wind Interaction with Venus from the Galileo Flyby

During the 10 February 1990 flyby of Venus, the Galileo spacecraft skimmed the downstream flank of the planetary bow shock. This provided an opportunity to examine both the global and the local

Pedersen, ibid

  • 1986