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Hybrid Simulation of the Shock Wave Trailing the Moon
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External Online Source: doi:10.1029/2011JA017358
Author and Affiliation:
Israelevich, P.(Tel-Aviv Univ., Ramat-Aviv, Department of Geophysics and Planetary Sciences, Tel-Aviv, Israel);
Ofman, Leon(Catholic Univ. of America, Washington, DC, United States)
Abstract: A standing shock wave behind the Moon was predicted by Michel (1967) but never observed nor simulated. We use 1D hybrid code in order to simulate the collapse of the plasma-free cavity behind the Moon and for the first time to model the formation of this shock. Starting immediately downstream of the obstacle we consider the evolution of plasma expansion into the cavity in the frame of reference moving along with the solar wind. Well-known effects as electric charging of the cavity affecting the plasma flow and counterstreaming ion beams in the wake are reproduced. Near the apex of the inner Mach cone where the plasma flows from the opposite sides of the obstacle meet, a shock wave arises. We expect the shock to be produced at periods of high electron temperature solar wind streams (T(sub i) much less than T(sub e) approximately 100 eV). The shock is produced by the interaction of oppositely directed proton beams in the plane containing solar wind velocity and interplanetary magnetic field vectors. In the direction across the magnetic field and the solar wind velocity, the shock results from the interaction of the plasma flow with the region of the enhanced magnetic field inside the cavity that plays the role of the magnetic barrier. The appearance of the standing shock wave is expected at the distance of approximately 7R(sub M) downstream of the Moon.
Publication Date: Aug 25, 2012
Document ID:
20140010226
(Acquired Aug 22, 2014)
Subject Category: SOLAR PHYSICS
Report/Patent Number: GSFC-E-DAA-TN10038
Document Type: Journal Article
Publication Information: Journal of Geophysical Research; Volume 117; Issue A8; A08223
Publisher Information: American Geophysical Union
Contract/Grant/Task Num: NNG11PL10A; NNX10AC56G
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 12p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution under U.S. Government purpose rights; Under NASA grants NNG11PL10A and NNX10AC56G
NASA Terms: SHOCK WAVES; MOON; SIMULATION; SOLAR WIND VELOCITY; MAGNETOHYDRODYNAMIC FLOW; PLASMA DENSITY; PLASMAS (PHYSICS); INTERPLANETARY MAGNETIC FIELDS; PROTON BEAMS; ELECTRON ENERGY; ELECTRIC CHARGE
Other Descriptors: SHOCK WAVE; HYBRID MODEL; MOON
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