| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
|
|
|
|
A Particle-in-Cell Simulation Study on Harmonic Waves Excited by Electron Beams in Unmagnetized Plasmas |
| Jun Guo1,2** |
1College of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao 266061
2State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190
|
|
| Cite this article: |
|
Jun Guo 2016 Chin. Phys. Lett. 33 085202 |
|
|
|
|
Abstract The excitation of harmonic waves by an electron beam is studied with electrostatic simulations. The results suggest that the harmonic waves are excited during the linear stage of the simulation and are developed in the nonlinear stage. First, the Langmuir waves (LWs) are excited by the beam electrons. Then the coupling of the forward propagating LWs and beam modes will excite the second harmonic waves. The third harmonic waves will be produced if the lower velocity side of the beam still has a positive velocity gradient. The beam velocity decreases at the same time, which provides the energy for wave excitation. We find that it is difficult to excite the harmonic waves with the increase of the thermal velocity of the beam electrons. The beam electrons will be heated after waves are excited, and then the part of the forward propagating LWs will turn into electron acoustic waves under the condition with a large enough intensity of beam electrons. Moreover, the action of ions hardly affects the formation of harmonic waves.
|
|
|
Received: 30 April 2016
Published: 31 August 2016
|
|
| PACS: |
52.35.Qz
|
(Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.))
|
| |
52.35.Fp
|
(Electrostatic waves and oscillations (e.g., ion-acoustic waves))
|
| |
52.65.Rr
|
(Particle-in-cell method)
|
|
|
|
|
|
| [1] | Lu Q M, Lembege B, Tao J B and Wang S 2008 J. Geophys. Res. 113 A11219 | | [2] | Wu M Y, Lu Q M, Zhu J, Du A M and Wang S 2012 Astrophys. Space Sci. 338 81 | | [3] | Wu M Y, Lu Q M, Zhu J, Wang R S and Wang S 2013 Plasma Sci. Technol. 15 17 | | [4] | Guo J and Yu B 2012 Chin. Phys. Lett. 29 035203 | | [5] | Anderson R R, Eastman T E, Gurnett D A, Frank L A and Parks G K 1981 J. Geophys. Res. 86 4493 | | [6] | Thomsen M F, Gary S P, Feldman W C, Cole T E and Barr H C 1983 J. Geophys. Res. 88 3035 | | [7] | Mace R L and Hellberg M A 1990 J. Plasma Phys. 43 239 | | [8] | Cairns I H 1986 J. Geophys. Res. 91 2975 | | [9] | Treumann R A, Bauer O H, LaBelle J, Haerendel G, Christiansen P J, Darbyshire A G, Norris A J, Woolliscroft L J C, Anderson R R, Gurnett D A, Holtzworth R W, Koons H C and Roeder J 1986 Adv. Space Res. 6 93 | | [10] | Kliem B, Krüger A and Treumann R A 1992 Sol. Phys. 140 149 | | [11] | Thejappa G and MacDowall R J 2014 ASP Conf. Ser. (Myrtle Beach South Carolina 14-19 April 2013) 484 p210 | | [12] | Cairns Iver H and Robinson P A 1995 Geophys. Res. Lett. 22 3437 | | [13] | Kasaba Y, Matsumoto H and Omura Y 2001 J. Geophys. Res. 106 18693 | | [14] | Klimass A J 1983 J. Geophys. Res. 88 9081 | | [15] | Nishikawa K I and Cairns I H 1991 J. Geophys. Res. 96 19343 | | [16] | Schriver D, Ashour-Abdalla M, Sotnikov V, Hellinger P, Fiala V, Bingham R and Mangeney A 2000 J. Geophys. Res. 105 12919 | | [17] | Yoon P H, Wu C S, Vinus A F, Reiner M J, Fainberg J and Stone R G 1994 J. Geophys. Res. 99 23481 | | [18] | Sauer K and Sydora R D 2015 J. Geophys. Res. 120 235 | | [19] | Huang Y and Huang G L 2009 Astron. Astrophys. 503 207 | | [20] | Huang Y and Huang G L 2008 Adv. Space Res. 41 1202 | | [21] | Lu Q M, Wang S and Dou X K 2005 Phys. Plasmas 12 072903 | | [22] | Treumann R and Baumjohann W 1997 Advanced Space Plasma Physics (London: Imperial College Press) chap 4 p 73 | | [23] | Gary S P and Tokar R L 1985 Phys. Fluids 28 2439 |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
