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Observations of an interplanetary switch-on shock driven by a magnetic cloud
Feng, H. Q.; Lin, C. C.; Chao, J. K.; Wu, D. J.; Lyu, L. H.; Lee, L. C.; 北京8701信箱
Department其他
Source PublicationGeophysical Research Letters
2009
Volume36Pages:L07106
ISSN0094-8276
Language英语
KeywordRankine-hugoniot Problem Quasi-parallel Bow Shock Cylinder Wind Flow
AbstractA possible interplanetary switch-on shock event prior to a trailing magnetic cloud was observed on August 1, 2002 at 1 AU. We fit the data with the Rankine-Hugoniot (R-H) relations based on both oblique and switch-on shock models. It is found that both models are consistent with the observed data, and the best fit solutions of the two models are close to one another. For the oblique shock model, the best fit upstream shock normal angle, theta(BN1) (= cos(-1) (B-t1/B-t1)), is as small as 5.55 degrees. The shock has the following characteristics: (1) plasma density, plasma temperature, and the magnetic field strength all increase across the shock, (2) protons are thermalized very efficiently across the shock, but it is not the case for electrons, (3) the fast-mode Mach number is greater than unity in the preshock region and less than unity in the postshock region, and (4) from the oblique shock model we find that the normal Alfven Mach number is very close to unity in the postshock region, while from the switch-on shock model we obtain a solution of unity normal Alfven Mach number. Our results clearly demonstrate the MHD character of a fast shock propagating along the ambient magnetic field.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1702
Collection其他部室
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Feng, H. Q.,Lin, C. C.,Chao, J. K.,et al. Observations of an interplanetary switch-on shock driven by a magnetic cloud[J]. Geophysical Research Letters,2009,36:L07106.
APA Feng, H. Q..,Lin, C. C..,Chao, J. K..,Wu, D. J..,Lyu, L. H..,...&北京8701信箱.(2009).Observations of an interplanetary switch-on shock driven by a magnetic cloud.Geophysical Research Letters,36,L07106.
MLA Feng, H. Q.,et al."Observations of an interplanetary switch-on shock driven by a magnetic cloud".Geophysical Research Letters 36(2009):L07106.
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