The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform

E V Gubanov - One of the best experts on this subject based on the ideXlab platform.

  • mhd effects due to the hypersonic motion of a cylindrical body in the magnetosphere of a planet for mutually perpendicular orientations of the generatrix and magnetic field
    2000
    Co-Authors: E V Gubanov, A P Likhachev, S A Medin, V E Fortov
    Abstract:

    MHD-effects associated with the movement of a weakly conducting cylindrical body in a planetary atmosphere are analyzed numerically. The longitudinal axis of the body is perpendicular to the direction of motion and the field lines of the planetary magnetic field. In the calculations we used data similar to those for the collision of the Shoemaker-Levy 9 Comet with Jupiter. The simulation is developed for two atmospheric levels: H∼100 km (magnetic pressure number RH≤1) and H∼280 km (RH∼1). It is shown that the maximum strength of the induced magnetic field is 2–3 orders of magnitude greater than the planetary magnetic field. For small RH, analytical expressions giving a fairly reliable estimate for the field strength in the shock-compressed space ahead of the body are obtained.

  • mhd effects of meteoroid interaction with planetary magnetic field
    38th Aerospace Sciences Meeting and Exhibit, 2000
    Co-Authors: V E Fortov, E V Gubanov, A P Likhachev, S A Medin
    Abstract:

    The paper considers MHD effects accompanying the meteoroid movement in planetary magnetic field. Two-dimensional computer simulation is performed under conditions of the Shoemaker-Levy 9 Comet impact on the Jupiter. The distributions of electrodynamic (induced magnetic field, electric field, and current) and gasdynamic (pressure, velocity, etc) parameters are determined for various intensities of the MHD interaction corresponding to different altitudes of atmosphere. The computations show that the induced magnetic field can be l-3 orders of magnitude higher than the planetary one. It has been found out that the MHD interaction in rarefied atmosphere layers is rather high resulting in the shock wave displacement from the meteoroid body, two-vortex gasdynamic structure in shock-compressed area in front of the body is formed and intensity of vortexes in bottom region is substantially decreased. MKD jet is generated in the far wake downstream off the meteoroid body. INTRODUCTION The hypersonic movement of a meteoroid (i.e. asteroid Comet’s fragment, etc) in planetary atmosphere is accompanied by an formation of strong ionizing bow shock. The interaction of resulting plasma structures with planetary magnetic field gives rise to the MHD effects which C?Z be reflected by magnetic field disturbances as well as flow variations. The interest to this problem appeared due to the elaboration of prognostic scenarios of the impact of Comet Shoemaker-Levy 9 on Jupiter and the analysis of its observations’. Besides that, the study of these effects may be useful to understand a number of ,anomalous magnetospheric and geophysical phenomena, in particular. a radiative response of polar regions of magnetosphere to approach of meteoroid to planet’ and rather high residual magnetization of some rocks in meteorite craters2. 1. THE GENERAL MODEL FEATURES The main physical assumptions used at the problem formulation are the following: the initial stage of meteoroid movement in the atmosphere is characterized by practically constant velocity and unchanged body shape is assumed; the meteoroid body geometry is set up as a long bar of square cross-section. the direction of meteoroid movement is normal to its longitudinal axis: Copyright

  • mhd effects driven by the hypersonic motion of a cylindrical body through a planetary magnetosphere with parallel orientation of the cylinder generator and the magnetic field
    Fluid Dynamics, 1999
    Co-Authors: E V Gubanov, A P Likhachev, S A Medin, B E Fortov
    Abstract:

    Magnetohydrodynamic (MHD) effects caused by the motion of a meteoroid (asteroid, fragment of a Comet, etc.) through the atmosphere of a planet with its own magnetic field are investigated numerically. The situation in which the meteoroid is a long body whose axis is parallel to the planets magnetic field lines and perpendicular to the velocity of the body is considered. When the effect of the end faces of the meteoroid is neglected, the meteoroid parameters along its longitudinal axis (and the planet's magnetic field lines) remain invariant and the problem can be reduced to the two-dimensional formulation. A numerical model makes it possible to study the process of MHD interaction over a wide range of magnetic Reynolds numbers R m and magnetic pressure parameters R H . The MHD effects associated with the motion of a meteoroid through dense (R H 1) and rarefied (R H ∼ 1) atmospheric layers are investigated. Observation data similar to those realized in the collision of the Shoemaker-Levy 9 Comet with Jupiter were used in the calculations on the assumption that the meteoroid has weak conductivity. It is shown that the magnetic field has a maximum in the shocked zone ahead of the meteoroid, the ratio of the maximum magnetic field to the planet's own magnetic field being approximately equal to the inverse velocity ratio in the central zone of the shock wave. The solutions obtained are analyzed in detail.

V E Fortov - One of the best experts on this subject based on the ideXlab platform.

  • mhd effects due to the hypersonic motion of a cylindrical body in the magnetosphere of a planet for mutually perpendicular orientations of the generatrix and magnetic field
    2000
    Co-Authors: E V Gubanov, A P Likhachev, S A Medin, V E Fortov
    Abstract:

    MHD-effects associated with the movement of a weakly conducting cylindrical body in a planetary atmosphere are analyzed numerically. The longitudinal axis of the body is perpendicular to the direction of motion and the field lines of the planetary magnetic field. In the calculations we used data similar to those for the collision of the Shoemaker-Levy 9 Comet with Jupiter. The simulation is developed for two atmospheric levels: H∼100 km (magnetic pressure number RH≤1) and H∼280 km (RH∼1). It is shown that the maximum strength of the induced magnetic field is 2–3 orders of magnitude greater than the planetary magnetic field. For small RH, analytical expressions giving a fairly reliable estimate for the field strength in the shock-compressed space ahead of the body are obtained.

  • mhd effects of meteoroid interaction with planetary magnetic field
    38th Aerospace Sciences Meeting and Exhibit, 2000
    Co-Authors: V E Fortov, E V Gubanov, A P Likhachev, S A Medin
    Abstract:

    The paper considers MHD effects accompanying the meteoroid movement in planetary magnetic field. Two-dimensional computer simulation is performed under conditions of the Shoemaker-Levy 9 Comet impact on the Jupiter. The distributions of electrodynamic (induced magnetic field, electric field, and current) and gasdynamic (pressure, velocity, etc) parameters are determined for various intensities of the MHD interaction corresponding to different altitudes of atmosphere. The computations show that the induced magnetic field can be l-3 orders of magnitude higher than the planetary one. It has been found out that the MHD interaction in rarefied atmosphere layers is rather high resulting in the shock wave displacement from the meteoroid body, two-vortex gasdynamic structure in shock-compressed area in front of the body is formed and intensity of vortexes in bottom region is substantially decreased. MKD jet is generated in the far wake downstream off the meteoroid body. INTRODUCTION The hypersonic movement of a meteoroid (i.e. asteroid Comet’s fragment, etc) in planetary atmosphere is accompanied by an formation of strong ionizing bow shock. The interaction of resulting plasma structures with planetary magnetic field gives rise to the MHD effects which C?Z be reflected by magnetic field disturbances as well as flow variations. The interest to this problem appeared due to the elaboration of prognostic scenarios of the impact of Comet Shoemaker-Levy 9 on Jupiter and the analysis of its observations’. Besides that, the study of these effects may be useful to understand a number of ,anomalous magnetospheric and geophysical phenomena, in particular. a radiative response of polar regions of magnetosphere to approach of meteoroid to planet’ and rather high residual magnetization of some rocks in meteorite craters2. 1. THE GENERAL MODEL FEATURES The main physical assumptions used at the problem formulation are the following: the initial stage of meteoroid movement in the atmosphere is characterized by practically constant velocity and unchanged body shape is assumed; the meteoroid body geometry is set up as a long bar of square cross-section. the direction of meteoroid movement is normal to its longitudinal axis: Copyright

S A Medin - One of the best experts on this subject based on the ideXlab platform.

  • mhd effects due to the hypersonic motion of a cylindrical body in the magnetosphere of a planet for mutually perpendicular orientations of the generatrix and magnetic field
    2000
    Co-Authors: E V Gubanov, A P Likhachev, S A Medin, V E Fortov
    Abstract:

    MHD-effects associated with the movement of a weakly conducting cylindrical body in a planetary atmosphere are analyzed numerically. The longitudinal axis of the body is perpendicular to the direction of motion and the field lines of the planetary magnetic field. In the calculations we used data similar to those for the collision of the Shoemaker-Levy 9 Comet with Jupiter. The simulation is developed for two atmospheric levels: H∼100 km (magnetic pressure number RH≤1) and H∼280 km (RH∼1). It is shown that the maximum strength of the induced magnetic field is 2–3 orders of magnitude greater than the planetary magnetic field. For small RH, analytical expressions giving a fairly reliable estimate for the field strength in the shock-compressed space ahead of the body are obtained.

  • mhd effects of meteoroid interaction with planetary magnetic field
    38th Aerospace Sciences Meeting and Exhibit, 2000
    Co-Authors: V E Fortov, E V Gubanov, A P Likhachev, S A Medin
    Abstract:

    The paper considers MHD effects accompanying the meteoroid movement in planetary magnetic field. Two-dimensional computer simulation is performed under conditions of the Shoemaker-Levy 9 Comet impact on the Jupiter. The distributions of electrodynamic (induced magnetic field, electric field, and current) and gasdynamic (pressure, velocity, etc) parameters are determined for various intensities of the MHD interaction corresponding to different altitudes of atmosphere. The computations show that the induced magnetic field can be l-3 orders of magnitude higher than the planetary one. It has been found out that the MHD interaction in rarefied atmosphere layers is rather high resulting in the shock wave displacement from the meteoroid body, two-vortex gasdynamic structure in shock-compressed area in front of the body is formed and intensity of vortexes in bottom region is substantially decreased. MKD jet is generated in the far wake downstream off the meteoroid body. INTRODUCTION The hypersonic movement of a meteoroid (i.e. asteroid Comet’s fragment, etc) in planetary atmosphere is accompanied by an formation of strong ionizing bow shock. The interaction of resulting plasma structures with planetary magnetic field gives rise to the MHD effects which C?Z be reflected by magnetic field disturbances as well as flow variations. The interest to this problem appeared due to the elaboration of prognostic scenarios of the impact of Comet Shoemaker-Levy 9 on Jupiter and the analysis of its observations’. Besides that, the study of these effects may be useful to understand a number of ,anomalous magnetospheric and geophysical phenomena, in particular. a radiative response of polar regions of magnetosphere to approach of meteoroid to planet’ and rather high residual magnetization of some rocks in meteorite craters2. 1. THE GENERAL MODEL FEATURES The main physical assumptions used at the problem formulation are the following: the initial stage of meteoroid movement in the atmosphere is characterized by practically constant velocity and unchanged body shape is assumed; the meteoroid body geometry is set up as a long bar of square cross-section. the direction of meteoroid movement is normal to its longitudinal axis: Copyright

  • mhd effects driven by the hypersonic motion of a cylindrical body through a planetary magnetosphere with parallel orientation of the cylinder generator and the magnetic field
    Fluid Dynamics, 1999
    Co-Authors: E V Gubanov, A P Likhachev, S A Medin, B E Fortov
    Abstract:

    Magnetohydrodynamic (MHD) effects caused by the motion of a meteoroid (asteroid, fragment of a Comet, etc.) through the atmosphere of a planet with its own magnetic field are investigated numerically. The situation in which the meteoroid is a long body whose axis is parallel to the planets magnetic field lines and perpendicular to the velocity of the body is considered. When the effect of the end faces of the meteoroid is neglected, the meteoroid parameters along its longitudinal axis (and the planet's magnetic field lines) remain invariant and the problem can be reduced to the two-dimensional formulation. A numerical model makes it possible to study the process of MHD interaction over a wide range of magnetic Reynolds numbers R m and magnetic pressure parameters R H . The MHD effects associated with the motion of a meteoroid through dense (R H 1) and rarefied (R H ∼ 1) atmospheric layers are investigated. Observation data similar to those realized in the collision of the Shoemaker-Levy 9 Comet with Jupiter were used in the calculations on the assumption that the meteoroid has weak conductivity. It is shown that the magnetic field has a maximum in the shocked zone ahead of the meteoroid, the ratio of the maximum magnetic field to the planet's own magnetic field being approximately equal to the inverse velocity ratio in the central zone of the shock wave. The solutions obtained are analyzed in detail.

A P Likhachev - One of the best experts on this subject based on the ideXlab platform.

  • mhd effects due to the hypersonic motion of a cylindrical body in the magnetosphere of a planet for mutually perpendicular orientations of the generatrix and magnetic field
    2000
    Co-Authors: E V Gubanov, A P Likhachev, S A Medin, V E Fortov
    Abstract:

    MHD-effects associated with the movement of a weakly conducting cylindrical body in a planetary atmosphere are analyzed numerically. The longitudinal axis of the body is perpendicular to the direction of motion and the field lines of the planetary magnetic field. In the calculations we used data similar to those for the collision of the Shoemaker-Levy 9 Comet with Jupiter. The simulation is developed for two atmospheric levels: H∼100 km (magnetic pressure number RH≤1) and H∼280 km (RH∼1). It is shown that the maximum strength of the induced magnetic field is 2–3 orders of magnitude greater than the planetary magnetic field. For small RH, analytical expressions giving a fairly reliable estimate for the field strength in the shock-compressed space ahead of the body are obtained.

  • mhd effects of meteoroid interaction with planetary magnetic field
    38th Aerospace Sciences Meeting and Exhibit, 2000
    Co-Authors: V E Fortov, E V Gubanov, A P Likhachev, S A Medin
    Abstract:

    The paper considers MHD effects accompanying the meteoroid movement in planetary magnetic field. Two-dimensional computer simulation is performed under conditions of the Shoemaker-Levy 9 Comet impact on the Jupiter. The distributions of electrodynamic (induced magnetic field, electric field, and current) and gasdynamic (pressure, velocity, etc) parameters are determined for various intensities of the MHD interaction corresponding to different altitudes of atmosphere. The computations show that the induced magnetic field can be l-3 orders of magnitude higher than the planetary one. It has been found out that the MHD interaction in rarefied atmosphere layers is rather high resulting in the shock wave displacement from the meteoroid body, two-vortex gasdynamic structure in shock-compressed area in front of the body is formed and intensity of vortexes in bottom region is substantially decreased. MKD jet is generated in the far wake downstream off the meteoroid body. INTRODUCTION The hypersonic movement of a meteoroid (i.e. asteroid Comet’s fragment, etc) in planetary atmosphere is accompanied by an formation of strong ionizing bow shock. The interaction of resulting plasma structures with planetary magnetic field gives rise to the MHD effects which C?Z be reflected by magnetic field disturbances as well as flow variations. The interest to this problem appeared due to the elaboration of prognostic scenarios of the impact of Comet Shoemaker-Levy 9 on Jupiter and the analysis of its observations’. Besides that, the study of these effects may be useful to understand a number of ,anomalous magnetospheric and geophysical phenomena, in particular. a radiative response of polar regions of magnetosphere to approach of meteoroid to planet’ and rather high residual magnetization of some rocks in meteorite craters2. 1. THE GENERAL MODEL FEATURES The main physical assumptions used at the problem formulation are the following: the initial stage of meteoroid movement in the atmosphere is characterized by practically constant velocity and unchanged body shape is assumed; the meteoroid body geometry is set up as a long bar of square cross-section. the direction of meteoroid movement is normal to its longitudinal axis: Copyright

  • mhd effects driven by the hypersonic motion of a cylindrical body through a planetary magnetosphere with parallel orientation of the cylinder generator and the magnetic field
    Fluid Dynamics, 1999
    Co-Authors: E V Gubanov, A P Likhachev, S A Medin, B E Fortov
    Abstract:

    Magnetohydrodynamic (MHD) effects caused by the motion of a meteoroid (asteroid, fragment of a Comet, etc.) through the atmosphere of a planet with its own magnetic field are investigated numerically. The situation in which the meteoroid is a long body whose axis is parallel to the planets magnetic field lines and perpendicular to the velocity of the body is considered. When the effect of the end faces of the meteoroid is neglected, the meteoroid parameters along its longitudinal axis (and the planet's magnetic field lines) remain invariant and the problem can be reduced to the two-dimensional formulation. A numerical model makes it possible to study the process of MHD interaction over a wide range of magnetic Reynolds numbers R m and magnetic pressure parameters R H . The MHD effects associated with the motion of a meteoroid through dense (R H 1) and rarefied (R H ∼ 1) atmospheric layers are investigated. Observation data similar to those realized in the collision of the Shoemaker-Levy 9 Comet with Jupiter were used in the calculations on the assumption that the meteoroid has weak conductivity. It is shown that the magnetic field has a maximum in the shocked zone ahead of the meteoroid, the ratio of the maximum magnetic field to the planet's own magnetic field being approximately equal to the inverse velocity ratio in the central zone of the shock wave. The solutions obtained are analyzed in detail.

B E Fortov - One of the best experts on this subject based on the ideXlab platform.

  • mhd effects driven by the hypersonic motion of a cylindrical body through a planetary magnetosphere with parallel orientation of the cylinder generator and the magnetic field
    Fluid Dynamics, 1999
    Co-Authors: E V Gubanov, A P Likhachev, S A Medin, B E Fortov
    Abstract:

    Magnetohydrodynamic (MHD) effects caused by the motion of a meteoroid (asteroid, fragment of a Comet, etc.) through the atmosphere of a planet with its own magnetic field are investigated numerically. The situation in which the meteoroid is a long body whose axis is parallel to the planets magnetic field lines and perpendicular to the velocity of the body is considered. When the effect of the end faces of the meteoroid is neglected, the meteoroid parameters along its longitudinal axis (and the planet's magnetic field lines) remain invariant and the problem can be reduced to the two-dimensional formulation. A numerical model makes it possible to study the process of MHD interaction over a wide range of magnetic Reynolds numbers R m and magnetic pressure parameters R H . The MHD effects associated with the motion of a meteoroid through dense (R H 1) and rarefied (R H ∼ 1) atmospheric layers are investigated. Observation data similar to those realized in the collision of the Shoemaker-Levy 9 Comet with Jupiter were used in the calculations on the assumption that the meteoroid has weak conductivity. It is shown that the magnetic field has a maximum in the shocked zone ahead of the meteoroid, the ratio of the maximum magnetic field to the planet's own magnetic field being approximately equal to the inverse velocity ratio in the central zone of the shock wave. The solutions obtained are analyzed in detail.