Results 131 to 140 of about 2,940 (168)

MMS bow shock crossings database

2022
<p>Identifying collisionless shock crossings in data sent from spacecraft has so far been done manually. It is a tedious job that shock physicists have to go through if they want to conduct case studies or perform statistical studies. We use a machine learning approach to automatically identify shock crossings from the Magnetospheric ...
Yuri Khotyaintsev, Ahmad Lalti, Andrew P. Dimmock, Andreas Johlander, Daniel B. Graham   +4 more
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Bow Shocks in Globular Clusters?

Publications of the Astronomical Society of Australia, 1991
AbstractIt has been suggested that diffuse X-ray sources observed in globular clusters may arise in bow shocks formed by the interaction of intracluster gas with a tenuous halo medium. This paper presents a study both of the cluster space motions and of the energetics of any possible bow shocks which would seem to rule out this hypothesis.
D. J. Faulkner, Graeme H. Smith
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Magnetohydrodynamic aspects of the Earth’s bow shock 1. Equilibrium bow shock position

Journal of Geophysical Research, 1974
The fluid dynamic treatment of the magnetosphere-bow shock system provides a useful means to calculate the equilibrium standoff distance of the shock. From the simple gas dynamic model a specific heat ratio γ≈5/3 of the streaming plasma is found to be appropriate for average solar wind conditions.
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Revisiting cometary bow shock positions

Planetary and Space Science, 2013
The Rosetta spacecraft will arrive at comet 67P/Churyumov–Gerasimenko in 2014 and will escort the comet along its journey around the Sun. The predicted outgassing rate of the comet and the solar wind properties close to its perihelion at 1.24 AU lead to the expectation that a cometary bow shock will form during the escort phase.
Koenders C., Glassmeier K. H., Richter I., Motschmann U., Rubin M.   +4 more
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Water Drop/Bow Shock Interactions.

1975
Abstract : The interaction of water drops of diameters in the range of 20 to 200 micrometers with reentry vehicle bow shocks was investigated with a microscope/Q-spoiled laser camera system. A single stream of water drops was generated on the trajectory of a Mach 12 projectile launched from a light gas gun.
Alan K. Hopkins, Henry R. Taylor, Edward S. Grood, John P. Barber   +3 more
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The Earth's bow shock wave

Journal of Geophysical Research, 1967
A model for a strong plasma shock wave with a structure determined by ion wave instabilities has been developed. The magnetic field structure of the shock wave is further investigated and found to have many features in agreement with satellite observations of the earth's bow shock.
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Interaction of interplanetary shocks with the bow shock

Planetary and Space Science, 2007
Abstract Fast forward interplanetary (IP) shocks have been identified as a source of large geomagnetic disturbances. However, the shocks can evolve in the solar wind, they are modified by interaction with the bow shock and during their propagation through the magnetosheath.
J. Šafránková, Z. Němeček, L. Přech, A.A. Samsonov, A. Koval, K. Andréeová   +5 more
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Propagation of Interplanetary Shocks Across the Bow Shock

AIP Conference Proceedings, 2010
An important problem of the Space Weather Program is the interaction of interplanetary (IP) shocks with the Earth magnetosphere because their interaction often (but not always) leads to major geomagnetic storms. Since the huge interaction region can be covered by simultaneous spacecraft observations only sporadically, global MHD modeling can help in ...
Zdeněk Nem̌ecěk, Jana Šafránková, Lubomír Přech, Andriy Koval, Jan Merka, M. Maksimovic, K. Issautier, N. Meyer-Vernet, M. Moncuquet, F. Pantellini   +9 more
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Ion Acceleration at the Earth’s Bow Shock

Space Science Reviews, 2012
The Earth’s bow shock is the most studied example of a collisionless shock in the solar system. It is also widely used to model or predict the behaviour at other astrophysical shock systems. Spacecraft observations, theoretical modelling and numerical simulations have led to a detailed understanding of the bow shock structure, the spatial organization ...
Burgess, D., Möbius, E., Scholer, M.
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Statistics of bow shock nonuniformity

Journal of Geophysical Research, 1973
The statistical occurrence of pulsation or oblique structure about the earth's generally nonuniform bow shock is estimated at selected points by combining a three-dimensional distribution of interplanetary field directions obtained for a six-day solar wind sector with an index of local pulsation geometry. The result, obtained with a pulsation index of
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