Minimum variance free wave identification: Application to Cluster electric field data in the magnetosheath

被引：27

作者：

Balikhin, MA ^{[1
]}

Pokhotelov, OA

Walker, SN

Amata, E

Andre, M

Dunlop, M

Alleyne, HSCK

机构：

[1] Univ Sheffield, Sheffield, S Yorkshire, England

[2] CNR, Ist Fis Spazio Interplanetario, I-00133 Frascati, Italy

[3] Swedish Inst Space Phys, Uppsala Div, Uppsala, Sweden

[4] Rutherford Appleton Lab, Div Space Sci, Didcot OX11 0QX, Oxon, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2003年 / 30卷 / 10期

关键词：

D O I：

10.1029/2003GL016918

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

[1] The electric field measurements provided by the EFW instrument on board Cluster spacecraft are used to identify the mode of plasma waves observed in the magnetosheath. Previous identifications of magnetosheath wave modes have involved either the use of dimensionless transport ratios (DR) calculated using magnetic field and plasma parameters or the use of magnetic field measurements together with a Minimum Variance (MV) analysis. However, by utilising simultaneous four point measurements it is possible to identify the observed wave dispersion without having to resort to the use of either the calculations of DR or MV. It is, therefore, possible to identify the mode of the observed waves using measurements of any parameter (electric field, density etc.). In the present paper low frequency waves observed in the electric field by Cluster spacecraft travelling through the magnetosheath are studied. The wave dispersion relation obtained from the data indicates that observed waves are mirror waves.

引用

页数：4

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