3D hybrid simulations of the interaction of a magnetic cloud with a bow shock

In this paper, we investigate the interaction of a magnetic cloud (MC) with a planetary bow shock using hybrid simulations. It is the first time to our knowledge that this interaction is studied using kinetic simulations which include self-consistently both the ion foreshock and the shock wave dynamics. We show that when the shock is in a quasi-perpendicular configuration, the MC's magnetic structure in the magnetosheath remains similar to that in the solar wind, whereas it is strongly altered downstream of a quasi-parallel shock. The latter can result in a reversal of the magnetic field north-south component in some parts of the magnetosheath. We also investigate how the MC affects in turn the outer parts of the planetary environment, i.e., from the foreshock to the magnetopause. We find the following: (i) The decrease of the Alfven Mach number at the MC's arrival causes an attenuation of the foreshock region because of the weakening of the bow shock. (ii) The foreshock moves along the bow shock's surface, following the rotation of the MC's magnetic field. (iii) Owing to the low plasma beta, asymmetric flows arise inside the magnetosheath, due to the magnetic tension force which accelerates the particles in some parts of the magnetosheath and slows them down in others. (iv) The quasi-parallel region forms a depression in the shock's surface. Other deformations of the magnetopause and the bow shock are also highlighted. All these effects can contribute to significantly modify the solar wind/magnetosphere coupling during MC events.

[1]  J. Lyon,et al.  Solar wind-magnetosphere energy coupling under extreme interplanetary conditions: MHD simulations , 2000 .

[2]  B. Tsurutani,et al.  Interplanetary conditions leading to superintense geomagnetic storms (Dst ≤ −250 nT) during solar cycle 23 , 2008 .

[3]  M. Liemohn,et al.  A statistical study of the geoeffectiveness of magnetic clouds during high solar activity years , 2003 .

[4]  K. Papadopoulos,et al.  An overview of the impact of the January 10–11 1997 magnetic cloud on the magnetosphere via global MHD simulation , 1998 .

[5]  A. Summers,et al.  Hydromagnetic flow around the magnetosphere , 1966 .

[6]  L. Přech,et al.  MHD analysis of propagation of an interplanetary shock across magnetospheric boundaries , 2011 .

[7]  H. Koskinen,et al.  Properties and geoeffectiveness of magnetic clouds in the rising, maximum and early declining phases of solar cycle 23 , 2005 .

[8]  S. Solomon,et al.  Coupled model simulation of a Sun-to-Earth space weather event , 2004 .

[9]  Yu Lin,et al.  Hybrid Simulation of Foreshock Waves and Ion Spectra and Their Linkage to Cusp Energetic Ions , 2009 .

[10]  M. Jeřáb,et al.  Improved bow shock model with dependence on the IMF strength , 2005 .

[11]  L. Přech,et al.  Interaction of Interplanetary Shocks With the Bow Shock and Their Propagation Within the Magnetosheath , 2007 .

[12]  E. Kilpua,et al.  A model of the magnetosheath magnetic field during magnetic clouds , 2014 .

[13]  Adam Szabo,et al.  The location of low Mach number bow shocks at Earth , 2001 .

[14]  H. Koskinen,et al.  Variability of magnetospheric storms driven by different solar wind perturbations , 2002 .

[15]  Alan Matthews,et al.  Simulated solar wind plasma interaction with the Martian exosphere: influence of the solar EUV flux on the bow shock and the magnetic pile-up boundary , 2006 .

[16]  Charles J. Farrugia,et al.  Anomalous magnetosheath properties during Earth passage of an interplanetary magnetic cloud , 1995 .

[17]  E. Kilpua,et al.  Magnetic clouds' structure in the magnetosheath as observed by Cluster and Geotail: four case studies , 2014 .

[18]  E. W. Pogue,et al.  Strong bulk plasma acceleration in Earth's magnetosheath: A magnetic slingshot effect? , 2007 .

[19]  C. Russell,et al.  On the relationship between magnetic cloud field polarity and geoeffectiveness , 2012 .

[20]  Lou‐Chuang Lee,et al.  Interaction of interplanetary shocks and rotational discontinuities with the Earth's bow shock , 1996 .

[21]  C. Farrugia,et al.  Observational aspects of IMF draping-related magnetosheath accelerations for northward IMF , 2013 .

[22]  M. Kivelson,et al.  Anomalous aspects of magnetosheath flow and of the shape and oscillations of the magnetopause during an interval of strongly northward interplanetary magnetic field , 1993 .

[23]  Hideaki Kawano,et al.  Magnetopause location under extreme solar wind conditions , 1998 .

[24]  H. Koskinen,et al.  Importance of post-shock streams and sheath region as drivers of intense magnetospheric storms and high-latitude activity , 2004 .

[25]  C. Farrugia,et al.  On accelerated magnetosheath flows under northward IMF , 2011 .

[26]  J. Lyon,et al.  Comparison of global MHD simulation results with actual storm and substorm events , 2001 .

[27]  Ronan Modolo,et al.  A global hybrid model for Titan's interaction with the Kronian plasma: Application to the Cassini Ta flyby , 2008 .

[28]  Minna Palmroth,et al.  Vlasiator: First global hybrid-Vlasov simulations of Earth's foreshock and magnetosheath , 2014 .

[29]  D. Sibeck,et al.  Size and shape of the distant magnetotail , 2014 .

[30]  D. Sibeck,et al.  Magnetosheath filamentary structures formed by ion acceleration at the quasi‐parallel bow shock , 2014 .

[31]  X. Blanco‐Cano,et al.  Dynamics of the foreshock compressional boundary and its connection to foreshock cavities , 2013 .

[32]  L. Přech,et al.  Reliability of prediction of the magnetosheath BZ component from interplanetary magnetic field observations , 2009 .

[33]  C. Russell,et al.  Macrostructure of collisionless bow shocks: 2. ULF waves in the foreshock and magnetosheath , 2006 .

[34]  L. Burlaga,et al.  Magnetic clouds and force‐free fields with constant alpha , 1988 .

[35]  Y. Yermolaev,et al.  Geoeffectiveness and efficiency of CIR, Sheath and ICME in generation of magnetic storms , 2011, 1109.1073.

[36]  A. Szabo,et al.  A summary of WIND magnetic clouds for years 1995-2003: model-fitted parameters, associated errors and classifications , 2006 .

[37]  C. Russell,et al.  Dipolar magnetospheres and their characterization as a function of magnetic moment , 2004 .

[38]  E. Kilpua,et al.  A comparison of bow shock models with Cluster observations during low Alfven Mach number magnetic clouds , 2013 .

[39]  N. Lugaz,et al.  Features of the interaction of interplanetary coronal mass ejections/magnetic clouds with the Earth's magnetosphere , 2013 .

[40]  J. Lyon,et al.  Solar wind density control of energy transfer to the magnetosphere , 2004 .

[41]  N. Gopalswamy,et al.  Solar Sources and Geospace Consequences of Interplanetary Magnetic Clouds Observed During Solar Cycle 23 , 2008 .

[42]  J. Lyon,et al.  The role of the bow shock in solar wind-magnetosphere coupling , 2011 .

[43]  Tamas I. Gombosi,et al.  Waves on the dusk flank boundary layer during very northward interplanetary magnetic field conditions: Observations and simulation , 2007 .

[44]  F. Mariani,et al.  Magnetic loop behind an interplanetary shock: Voyager, Helios and IMP-8 observations , 1981 .

[45]  L. Rosenqvist,et al.  An unusual giant spiral arc in the polar cap region during the northward phase of a Coronal Mass Ejection , 2007 .

[46]  W. Gonzalez,et al.  A statistical study of magnetic cloud parameters and geoeffectiveness , 2005 .

[47]  David G. Sibeck,et al.  The link between shocks, turbulence, and magnetic reconnection in collisionless plasmas , 2014 .

[48]  Yu Lin,et al.  Three-dimensional global hybrid simulation of dayside dynamics associated with the quasi-parallel bow shock , 2005 .

[49]  C. Russell,et al.  Macrostructure of collisionless bow shocks: 1. Scale lengths , 2005 .

[50]  C. Russell,et al.  Determining the standoff distance of the bow shock: Mach number dependence and use of models , 1994 .

[51]  G. Chanteur,et al.  Influence of the solar EUV flux on the Martian plasma environment , 2005 .

[52]  Ezequiel Echer,et al.  Interplanetary conditions causing intense geomagnetic storms (Dst ≤ −100 nT) during solar cycle 23 (1996–2006) , 2008 .

[53]  Y. Lin,et al.  Simulation of pressure pulses in the bow shock and magnetosheath driven by variations in interplanetary magnetic field direction , 1996 .

[54]  C. Farrugia,et al.  Accelerated magnetosheath flows caused by IMF draping: Dependence on latitude , 2012 .

[55]  Joseph E. Borovsky,et al.  Altered solar wind-magnetosphere interaction at low Mach numbers: Coronal mass ejections , 2008 .

[56]  A. Walker.  The Kelvin-Helmholtz instability in the low-latitude boundary layer , 1981 .

[57]  M. W. Dunlop,et al.  Asymmetry of magnetosheath flows and magnetopause shape during low Alfvén Mach number solar wind , 2013 .

[58]  A. Matthews,et al.  Current Advance Method and Cyclic Leapfrog for 2D Multispecies Hybrid Plasma Simulations , 1994 .

[59]  G. Chanteur,et al.  A global hybrid model for Mercury's interaction with the solar wind: Case study of the dipole representation , 2012 .