The scientific objective of solar corona and interplanetary research is the understanding of the various phenomena related to solar activities and their effects on the space environments of the Earth.Great progress has been made in the study of solar corona and interplanetary physics by the Chinese space physics community during the past years.This paper will give a brief report about the latest progress of the corona and interplanetary research in China during the years of 2010-2012.The paper can be divided into the following parts:solar corona and solar wind.CMEICME, magnetic reconnection,energetic particles,space plasma,space weather numerical modeling by 3D SIP-CESE MHD model,space weather prediction methods,and proposed missions.They constitute the abundant content of study for the complicated phenomena that originate from the solar corona,propagate in interplanetary space,and produce geomagnetic disturbances.All these progresses are acquired by the Chinese space physicists,either independently or through international collaborations.
In the solar corona, the magnetic flux rope is believed to be a fundamental structure that accounts for magnetic free energy storage and solar eruptions. Up to the present, the extrapolation of the magnetic field from boundary data has been the primary way to obtain fully three-dimensional magnetic information about the corona. As a result, the ability to reliably recover the coronal magnetic flux rope is important for coronal field extrapolation. In this paper, our coronal field extrapolation code is examined with an analytical magnetic flux rope model proposed by Titov ＆ D6moulin, which consists of a bipolar magnetic configuration holding a semi-circular line-tied flux rope in force-free equilibrium. By only using the vector field at the bottom boundary as input, we test our code with the model in a representative range of parameter space and find that the model field can be reconstructed with high accuracy. In particular, the magnetic topological interfaces formed between the flux rope and the surrounding arcade, i.e., the ＂hyperbolic flux tube＂ and ＂bald patch separatrix surface,＂ are also reliably reproduced. By this test, we demonstrate that our CESE-MHD-NLFFF code can be applied to recovering the magnetic flux rope in the solar corona as long as the vector magnetogram satisfies the force-free constraints.
We conduct simulations using the three-dimensional(3D)solar-interplanetary conservation element/solution element(SIP-CESE)maguetohydrodynamic(MHD)model and magnetogram data from a Carrington rotation(CR)1897 to compare the three commonly used heating methods,I.e.The Wentzel-Kramers-Brillouin(WKB)Alfvén wave heating method,the turbulence heating method and the volumetric heating method.Our results show that all three heating models can basically reproduce the bimodal structure of the solar wind observed near the solar minimum.The results also demonstrate that the major acceleration interval terminates about 4Rs for the turbulence heating method and 1ORs for both the WKB Alfvén wave heating method and the volumetric heating method.The turbulence heating and the volumetric heating methods can capture the observed changing trends by the WIND satellite,while the WKB Alfvén wave heating method does not.
YANG Li-PingFENG Xue-ShangXIANG Chang-QingJIANG Chao-Wei
