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Double layers
Double layers of space charge are formed where strong enough parallel currents appear in a plasma. Observations by the FAST satellite (e.g., Andersson et al. 2002, Phys. Plasmas, vol. 9, pp 3600-3609) have shown that double layers occur naturally in space plasmas in the auroral region and that high frequency electrostatic waves are generated on the DL's high-potential side (Gunell et al. 1996, J. Phys. D: Appl. Phys., vol. 29, pp 643-654, doi:10.1088/0022-3727/29/3/025). I have performed Vlasov simulations of auroral flux tubes, where double layers are seen in the acceleration region (Gunell et al. 2013, Ann. Geophys., vol. 31, pp 1227-1240, doi:10.5194/angeo-31-1227-2013).

A high frequency spike seen in a simulation.

Related publications

• "A high frequency probe for absolute measurements of electric fields in plasmas" by S. Torvén, H. Gunell and N. Brenning J. Phys. D: Appl. Phys., vol. 28, 595-599 (1995).
• "Bursts of high-frequency plasma waves at an electric double layer" by H. Gunell, N. Brenning, and S. Torvén J. Phys. D: Appl. Phys., vol. 29, 643-654 (1996).
• "Formation of Electric Field Spikes in Electron Beam-Plasma Interaction" by H. Gunell, J. P. Verboncoeur, N. Brenning, and S. Torvén Phys. Rev. Lett., vol. 77, 5059-5062 (1996).
• "Electric field spikes formed by electron beam-plasma interaction in plasma density gradients" by H. Gunell and T. Löfgren Copyright (1997) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in (Physics of Plasmas, vol 4, pp 2805-2812) and may be found at (H. Gunell and T. Löfgren, Phys. Plasmas 4, 2805 (1997) ).
• "Interacting Eigenmodes of a Plasma Diode with a Density Gradient" by T. Löfgren, and H. Gunell, Phys. Plasmas, vol. 5, 590-600 (1998) .
• "A localised high frequency discharge formed in an electron beam-produced plasma" by H. Gunell, R. Schrittwieser, and S. Torvén, Physics Letters A, vol. 241, 281-286 (1998).
• "Vlasov simulations of parallel potential drops" by H. Gunell, J. De Keyser, E. Gamby, and I. Mann, Annales Geophysicae, vol. 31, 1227-1240, 2013, doi:10.5194/angeo-31-1227-2013. The article includes supplementary material.
• "Numerical and laboratory simulations of auroral acceleration" by H. Gunell, J. De Keyser, and I. Mann, Copyright (2013) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Physics of Plasmas, vol. 20, 102901 (2013) and may be found at http://dx.doi.org/10.1063/1.4824453.
• "Vlasov simulations of trapping and loss of auroral electrons" by H. Gunell, L. Andersson, J. De Keyser, and I. Mann, Annales Geophysicae, vol. 33, 279-293, 2015, doi:10.5194/angeo-33-279-2015.
• "Self-consistent electrostatic simulations of reforming double layers in the downward current region of the aurora " by H. Gunell, L. Andersson, J. De Keyser, and I. Mann, Annales Geophysicae, vol. 33, 1331-1342, 2015, doi:10.5194/angeo-33-1331-2015. The article includes supplementary material.

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Updated 2015-10-30