Solar activity studies: From a magnetohydrodynamics description to a plasma perspective
Wang JingXiu
AbstractSolar activity, in which there is an explosive release of magnetic energy in the solar atmosphere, is one of the most spectacular manifestations of space plasma activity. Non-potential, free magnetic energy is accumulated by the interaction between plasma and magnetic fields in the photosphere and sub-photospheric layer. In the photosphere and lower solar atmosphere, plasma is only partially ionized and there is three-species (or three-fluid) plasma. Cowling conductivity should therefore be considered in explaining solar observations. On the other hand, the explosive release of magnetic energy is believed to be caused by magnetic reconnection in the corona, where plasma is fully ionized and essentially collisionless. However, for collisionless plasma, we seem to have no precise quantitative description or formulation of its conductivity. To physically understand magnetic reconnection in collisionless plasma is an important task in making further progress in solar activity studies. This article discusses the plasma perspective of solar activity studies. The discussion begins with solar observations, and then, an analysis of the plasma problems that we face and need to better understand.
KeywordPARTIALLY-IONIZED PLASMAS MAGNETIC RECONNECTION FLARES RESISTIVITY ATMOSPHERE EMERGENCE solar activity magnetohydrodynamics plasma physics magnetic reconnection
Funding Project[National Natural Science Foundation of China] ; [National Basic Research Program of China]
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang JingXiu. Solar activity studies: From a magnetohydrodynamics description to a plasma perspective[J]. CHINESE SCIENCE BULLETIN,2012,57(12):1362.
APA Wang JingXiu.(2012).Solar activity studies: From a magnetohydrodynamics description to a plasma perspective.CHINESE SCIENCE BULLETIN,57(12),1362.
MLA Wang JingXiu."Solar activity studies: From a magnetohydrodynamics description to a plasma perspective".CHINESE SCIENCE BULLETIN 57.12(2012):1362.
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