All Questions
Tagged with plasma-physics shock-waves
12 questions
2
votes
2
answers
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Theoretical rocket engine based on plasma shock waves particle acceleration
Credits for the article - https://www.quantamagazine.org/cosmic-map-of-ultrahigh-energy-particles-points-to-long-hidden-treasures-20210427
Can this mechanism be used to speed up gas particles to ...
4
votes
2
answers
118
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Plage regions data
Plages are phenomena of stellar activity.
Where can I find openly-accessible data of plage regions of the Sun with other parameters such as faculae region, magnetic field, etc?
- 193
2
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1
answer
212
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Why does the transverse Alfven mode not undergo wave steepening and hence resulting in shock waves?
Initial Question:
I am currently working through the second edition of Introduction to Plasma Physics by Donald A. Gurnett & A. Bhattacharjee
In section 8.3.8 on page 304, they state that:
.. on ...
- 724
2
votes
1
answer
64
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Interaction of supersonic wind with static Inter-Stellar Medium (ISM)
Recently I was studying about the interaction of supersonic flow (wind) with a slowly flowing medium. In a paper by Dyson, Falle, and Perry 1980 MNRAS stated that when a supersonic wind impinged upon ...
- 97
1
vote
1
answer
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Wave drag in the interstellar medium
In Earth's atmosphere, an object moving at supersonic or near-supersonic speed experiences wave drag due to the formation of shock waves around the object's leading edge. At high speeds, wave drag is ...
- 4,110
2
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1
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What is the most efficient particle acceleration mechanism in space and astrophysical plasmas
My question is:
What are the most efficient particle acceleration mechanisms in space and astrophysical plasmas: wave-particle interactions, collisionless shocks, or magnetic reconnection?
Does it ...
- 490
1
vote
1
answer
459
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The relative velocity of sound waves in Doppler effect
Let speed of sound in the medium be $v$ when the source is at rest w.r.t the medium.
In the case of the observer moving towards the stationary source with a velocity of $u_1$,
the speed of sound ...
- 72
3
votes
1
answer
677
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What's the difference between shock waves and acoustic waves?
What's the difference between shock waves and acoustic waves?
I tried and searched around this subject, but I could not find any relative article about it. Please help me find a proper answer.
- 41
2
votes
1
answer
71
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Derivation of average momentum change in diffusive shock acceleration
I am trying to figure out a specific step in the derivation of the power law spectrum for cosmic ray particles upon diffusive shock acceleration. I am working with Drury 1983 (pdf link) but I have ...
- 21
1
vote
1
answer
178
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Bulk viscosity in jump conditions for shock waves
One of the jump conditions for shock waves can be derived from the Navier-Stokes equation and it takes the form (see Shu, Gas dynamics, p.212)
$\dfrac{d}{dx}\left(\rho u^2 + P - \frac{4}{3}\mu \frac{...
- 111
3
votes
2
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724
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A question about the Fermi acceleration
In high school physics, we know that a charged particle cannot gain energy from a magnetic field. But, it seems that in the so-called Fermi acceleration, the particle is accelerated by the magnetic ...
- 1,075
2
votes
1
answer
211
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Particle acceleration at magnetized shocks by convective electric fields?
Let us assume we have a flow of charged particles in a quasi-neutral state (i.e., a plasma) convecting at some speed, $\mathbf{V}_{sw}$ = V$_{sw}$ $\hat{x}$, and the particles have species-dependent ...
- 15.8k