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15 May 2009, Volume 29 Issue 3
 Feature of the Martian Magnetic Field Structure ZHANG Yiteng;LI Lei 2009, 29 (3):  257-261.  doi: 10.11728/cjss2009.03.257 Abstract ( 3371 )   PDF (603KB) ( 1676 )   Based on a single-fluid MHD model, this paper has studied the global magnetic field structure in the near-Mars space, and investigated the influence of the Martian crustal magnetic fields on the magnetic field structure. Mars bow shock, Magnetic Pileup Region are produced when the solar wind flows over Mars. The interplanetary magnetic field lines are curved and draping' around the planet. The majority of magnetic field lines bypass over two poles, leaving V shaped' structure in the wake behind Mars. Near the surface of Mars, the local crustal magnetic fields also have noticeable influence on the magnetic field structure. The crustal magnetic fields at different positions, with different intensities form the dissimilar magnetic filed structure and mini-magnetospheres when interacting with the solar wind. The towed mini-magnetosphere and the mini-magnetosphere with open magnetic lines are illustrated in the paper. The local crustal magnetic fields change the morphology of the magnetic field, and accordingly may play an important role in determining the plasma distribution.
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 Study on Langmuir Wave Activities Within the Magnetic Cloud Boundary Layers Zuo Pingbing;Zhu Chunming;Wei Fengsi;Feng Xueshang;Li Huijun 2009, 29 (3):  262-267.  doi: 10.11728/cjss2009.03.262 Abstract ( 3441 )   PDF (805KB) ( 2625 )   Two particular types of Langmuir wave activities are found within the Magnetic Cloud Boundary Layers (MCBL): Langmuir wave enhancements in entire region of MCBL compared with the adjacent magnetic cloud body and sheath region for majority MCBL and the rapid Langmuir wave burst phenomena associated with broad-band Doppler shifted ion-coustic wave activities for a few MCBL. On 3 Oct., 2000, WIND detected a typical MCBL inside which rapid Langmuir waves burst was observed. The Langmuir waves burst was right corresponded to the magnetic field minimum within the MCBL. The analysis based on high resolution electron distribution function data indicates that the bump-on-tail instability, resulting from the electron beam with beam velocity vb about7×10^3 km/s, is responsible for the rapid Langmuir waves burst.
 Ionospheric Responses to IMF Southward Turnings in Mid- and Low-latitudes Sun Shuji;Chen Chun;Ding Zonghua;Ban Panpan;Xi Dilong 2009, 29 (3):  268-274.  doi: 10.11728/cjss2009.03.268 Abstract ( 2470 )   PDF (677KB) ( 1153 )   Using the historical data from ionosonde stations and satellite, the response of ionospheric f0F2 to major Interplanetary magnetic Field (IMF) southward turnings in mid- and low-latitudes is studied. It shows that the IMF southward turnings can cause disturbing response in the ionosphere, which depends on latitude, season and local time when the turning occurs. In mid-latitude, the ionospheric response to southward turnings in summer and equinox and by night is stronger, which fades out with latitude decreases. During the recovery phase the irregular fluctuation in the ionosphere comes forth. In low-latitude, the disturbance caused by the turnings is strong in summer and equinox and weak in winter, although it tends to be immersing into the background disturbances. It is also found that the maximal negative responses of the ionosphere is well related with the maximal negative Bz after the southward turnings linearly.
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