Clarification on Polarity of Bipolar Electric Field Solitary Structures in Space Plasmas with Satellite Observation
M. N. S. Qureshi1,2**, SHI Jian-Kui2, Klaus Torkar3, LIU Zhen-Xing2
1Department of Physics, GC University, Lahore 54000, Pakistan 2State Key Laboratory of Space Weather, Centre for Space Science and Applied Research (CSSAR), Chinese Academy of Sciences, Beijing 100190 3Space Research Institute, Austrian Academy of Sciences, A-8042, Graz, Austria
Clarification on Polarity of Bipolar Electric Field Solitary Structures in Space Plasmas with Satellite Observation
M. N. S. Qureshi1,2**, SHI Jian-Kui2, Klaus Torkar3, LIU Zhen-Xing2
1Department of Physics, GC University, Lahore 54000, Pakistan 2State Key Laboratory of Space Weather, Centre for Space Science and Applied Research (CSSAR), Chinese Academy of Sciences, Beijing 100190 3Space Research Institute, Austrian Academy of Sciences, A-8042, Graz, Austria
摘要The bipolar electric field solitary (EFS) structures observed frequently in space plasmas by satellites have two different polarities, first positive electric field peak then negative (i.e., positive/negative) and first negative then positive peak (i.e., negative/positive). We provide the physical explanation on the polarity of observed bipolar EFS structures with an electrostatic ion fluid model. The results show that if initial electric field E0>0, the polarity of the bipolar EFS structure will be positive/negative; and if E0 <0, the polarity of the bipolar EFS structure will be negative/positive. However, for a fixed polarity of the EFS, either positive/negative or negative/positive, if the satellite is located at the positive side of the EFS, the observed polarity should be positive/negative, if the satellite is located at the negative side of the EFS, the observed polarity should be negative/positive. Therefore, we provide a method to clarify the natural polarity of the EFS with observed polarity by satellites. Our results are significant to understand the physical process in space plasma with the satellite observation.
Abstract：The bipolar electric field solitary (EFS) structures observed frequently in space plasmas by satellites have two different polarities, first positive electric field peak then negative (i.e., positive/negative) and first negative then positive peak (i.e., negative/positive). We provide the physical explanation on the polarity of observed bipolar EFS structures with an electrostatic ion fluid model. The results show that if initial electric field E0>0, the polarity of the bipolar EFS structure will be positive/negative; and if E0 <0, the polarity of the bipolar EFS structure will be negative/positive. However, for a fixed polarity of the EFS, either positive/negative or negative/positive, if the satellite is located at the positive side of the EFS, the observed polarity should be positive/negative, if the satellite is located at the negative side of the EFS, the observed polarity should be negative/positive. Therefore, we provide a method to clarify the natural polarity of the EFS with observed polarity by satellites. Our results are significant to understand the physical process in space plasma with the satellite observation.
M. N. S. Qureshi;**;SHI Jian-Kui;Klaus Torkar;LIU Zhen-Xing
. Clarification on Polarity of Bipolar Electric Field Solitary Structures in Space Plasmas with Satellite Observation[J]. 中国物理快报, 2011, 28(2): 25204-025204.
M. N. S. Qureshi, **, SHI Jian-Kui, Klaus Torkar, LIU Zhen-Xing
. Clarification on Polarity of Bipolar Electric Field Solitary Structures in Space Plasmas with Satellite Observation. Chin. Phys. Lett., 2011, 28(2): 25204-025204.
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2011, Vol. 28 
