Results 171 to 180 of about 5,880 (188)

A comparative analysis of terrestrial and planetary bow shocks

2011 XXXth URSI General Assembly and Scientific Symposium, 2011
Collisionless shocks, such as the Earth bow shock, are very spectacular and energetic events in the Universe. For instance, generated by supernovae, stellar winds, and the solar wind collisonless shock have important effects. They are considered to be efficient particle accelerators and they act galactic nebula and therefore they are considered to ...
Harald Kucharek
openaire   +3 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 ...
Stamatios Krimigis
openaire   +3 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

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

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

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 ...
André Balogh, Rudolf A. Treumann
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

Planetary bow shocks

1985
Planetary bow shocks provide insight into both the behavior of collisionless shocks and the nature of the planetary obstacle responsible for creating those bow shocks. This review paper first presents a survey of the microstructure of planetary bow shocks using data obtained at Mercury, Venus, the earth, Mars, Jupiter, and Saturn.
openaire   +1 more source

HYDRODYNAMIC AND MHD EQUATIONS ACROSS THE BOW SHOCK AND ALONG THE SURFACES OF PLANETARY OBSTACLES

Space Science Reviews, 1997
Examinations of the magnetohydrodynamic (MHD) equations across a bow shock are presented. These equations are written in the familiar Rankine–Hugoniot set, and an exact solution to this set is given which involves the upstream magnetosonic Mach number, plasma β, polytropic index, and θ B-v , as a function of position ...
S. M. Petrinec, C. T. Russell
openaire   +1 more source

Shock drift acceleration of energetic protons at a planetary bow shock

Journal of Geophysical Research: Space Physics, 1992
We present the results of numerical orbit integrations of the interaction of suprathermal charged particles (protons) with a planetary bow shock. The primary goal of this study is to analyze the effect of the changing geometry of the shock, due to its curvature, on the kinematics of the particle/shock interaction. The model bow shock is a conic section
openaire   +1 more source