Magnetohydrodynamic simulation of the interaction between two interplanetary magnetic clouds and its consequent geoeffectiveness - Physics > Space PhysicsReport as inadecuate




Magnetohydrodynamic simulation of the interaction between two interplanetary magnetic clouds and its consequent geoeffectiveness - Physics > Space Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Numerical studies of the interplanetary -multiple magnetic clouds Multi-MC-are performed by a 2.5-dimensional ideal magnetohydrodynamic MHD model in theheliospheric meridional plane. Both slow MC1 and fast MC2 are initially emergedalong the heliospheric equator, one after another with different time interval.The coupling of two MCs could be considered as the comprehensive interactionbetween two systems, each comprising of an MC body and its driven shock. TheMC2-driven shock and MC2 body are successively involved into interaction withMC1 body. The momentum is transferred from MC2 to MC1. After the passage ofMC2-driven shock front, magnetic field lines in MC1 medium previouslycompressed by MC2-driven shock are prevented from being restored by the MC2body pushing. MC1 body undergoes the most violent compression from the ambientsolar wind ahead, continuous penetration of MC2-driven shock through MC1 body,and persistent pushing of MC2 body at MC1 tail boundary. As the evolutionproceeds, the MC1 body suffers from larger and larger compression, and itsoriginal vulnerable magnetic elasticity becomes stiffer and stiffer. So thereexists a maximum compressibility of Multi-MC when the accumulated elasticitycan balance the external compression. With respect to Multi-MCgeoeffectiveness, the evolution stage is a dominant factor, whereas thecollision intensity is a subordinate one. The magnetic elasticity, magnetichelicity of each MC, and compression between each other are the key physicalfactors for the formation, propagation, evolution, and resultinggeoeffectiveness of interplanetary Multi-MC.



Author: Ming Xiong 1,2, Huinan Zheng 1,2, S. T. Wu 3, Yuming Wang 1, Shui Wang 1 1 University of Science and Technology of China, Hefei,

Source: https://arxiv.org/







Related documents