Results 161 to 170 of about 288 (182)

Plasma wave turbulence at planetary bow shocks

Nature, 1981
Voyager 1 observations of plasma wave turbulence at Saturn's bow shock are discussed and compared with corresponding data from Jupiter, earth, and Venus. The results suggest that the plasma instabilities that develop at the lower Mach number bow shocks of the terrestrial planets differ from those found at the high Mach number bow shocks of the outer ...
William Kurth, Scarf F L, Kurth W S
exaly   +2 more sources

Planetary Bow Shocks

2013
Our present knowledge of the properties of the various planetary bow shocks is briefly reviewed. We do not follow the astronomical ordering of the planets. We rather distinguish between magnetised and unmagnetised planets which groups Mercury and Earth with the outer giant planets of the solar system, Mars and Moon in a separate group lacking magnetic ...
Balogh André, Treumann Rudolf A, André Balogh   +2 more
exaly   +2 more sources

On the nature of ULF waves upstream of planetary bow shocks

Advances in Space Research, 1981
The ULF electromagnetic waves associated with the earth's foreshock appear in two discrete frequency ranges, designated the low frequency waves at 0.01 - .05 Hz and the high frequency waves at 0.4 - 1.0 Hz. Falling within this second class are both the 0.4 Hz discrete wave packets and the slightly higher frequency wave trains commonly found just ...
M. Hoppe, C.T. Russell
exaly   +2 more sources

Heliospheric shocks (excluding planetary bow shocks)

Reviews of Geophysics, 1987
Even though it took place less than halfway through the last four year period, the AGU Chapman Conference in Napa Valley, California, during February, 1984, highlighted in many ways current U. S. contributions to the study of heliospheric shocks. Considerable recent progress in the theoretical understanding of these discontinuities has been summarized ...
exaly   +2 more sources

Upstream whistler-mode waves at planetary bow shocks: A brief review

Journal of Atmospheric and Solar-Terrestrial Physics, 2007
Upstream whistler-mode waves appear to be present in front of all collisionless shocks. Because the whistler-mode group velocity exceeds its phase velocity over the frequency range in which the phase velocity increases with frequency, interesting alterations of polarization and frequency spectrum occur in the observer's reference frame.
exaly   +2 more sources

Voyager energetic particle observations at interplanetary shocks and upstream of planetary bow shocks: 1977?1990

Space Science Reviews, 1992
The Voyager 1 and 2 spacecraft include instrumentation that makes comprehensive ion (E ≳ 28 keV) and electron (E ≳ 22 keV) measurements in several energy channels with good temporal, energy, and compositional resolution. Data collected over the past decade (1977–1988), including observations upstream and downstream of four planetary bow shocks (Earth ...
Krimigis S M
exaly   +2 more sources

Physics‐Based Analytical Model of the Planetary Bow Shock Position and Shape

Journal of Geophysical Research: Space Physics, 2021
AbstractIn studies of physical processes near planetary bow shocks, empirical models of the latter are usually used. While computational magneto‐hydrodynamics (MHD) or kinetic models of bow shocks are often more accurate, their computationally extensive nature limits their applicability to routine analysis of large volumes of data.
G. Kotova, M. Verigin, T. Gombosi, K. Kabin, J. Slavin, V. Bezrukikh   +5 more
openaire   +2 more sources

Features of Foreshock Transients at Planetary Bow Shocks

Solar System Research, 2023
In front of the bow shock with a quasi-parallel configuration of the interplanetary magnetic field, there exists a region called a foreshock, in which many nonstationary processes take place, the largest of which are collectively named “foreshock transients.” The size of these formations can reach tens of Earth radii, which significantly influences the
openaire   +1 more source

Particle acceleration at planetary bow shock waves

Nature, 1982
We can extend our understanding of collisionless shocks by comparing their behaviour in a variety of plasma conditions at several different planets. One property of such shocks is the occurrence of upstream magnetohydrodynamic waves associated with particle beams accelerated at these shocks, and flowing back towards the Sun1.
M. M. Hoppe, C. T. Russell
openaire   +1 more source

Analytical Description of the Near Planetary Bow Shock Based on Gas-Dynamic and Magneto-Gas–Dynamic Modeling for the Magnetic Field Parallel and Perpendicular to the Plasma Flow

Geomagnetism and Aeronomy, 2020
An analytical semiempirical model of the bow shock based on theoretical MGD calculations, accurate analytical solutions, and experimental data continues to be developed. The model parameters have a clear physical meaning. For cases in which the magnetic field of the solar wind is directed along its velocity or is perpendicular to the velocity vector ...
G. A. Kotova, M. I. Verigin, T. Gombosi, K. Kabin, V. V. Bezrukikh   +4 more
openaire   +1 more source