Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm33a..03s&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM33A-03
Physics
2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2736 Magnetosphere/Ionosphere Interactions (2431)
Scientific paper
The bipolar electric field structures were observed in many space plasmas, such as the solar wind, magnetosheath, magnetotail, and the auroral zone. In this study, a physical model for the existence of the bipolar electric field structures propagating along the magnetic field line is established by deriving the "Sagdeev potential" from the magnetohydrodynamic (MHD) equations in a cylindrical coordinate system. The model shows that the bipolar electric field structure can develop not only from an ion acoustic wave, but also from an ion cyclotron wave when the Mach number and the initial electric field satisfy certain conditions. The polarity of the bipolar electric field structure can be oriented either negative to positive or the reverse polarity. According to the conditions in the auroral region, amplitude of the BEF structure can be varied from 35 to 330 mV/m, and its duration can be 7 ms to 23 ms. These predictions are in agreement with observation in the auroral region.
Dunlop Malcolm
Liu Zhiyi
Qureshi N.
Shi Jianrong
Torkar Klaus
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