Analysis methods for multi-component wave measurements on board the DEMETER spacecraft

被引:59
作者
Santolik, O. [1 ]
Nemec, F.
Parrot, M.
Lagoutte, D.
Madrias, L.
Berthelier, J. J.
机构
[1] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic
[2] CNRS, Lab Phys & Chim Environm, F-45071 Orleans, France
[3] CNRS, CETP, St Maur des Fosses, France
[4] ASCR, Inst Atmospher Phys, Prague, Czech Republic
关键词
DEMETER micro-satellite; Poynting flux measurements; wave vector measurements; wave distribution function; ray tracing;
D O I
10.1016/j.pss.2005.10.020
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We describe analysis methods to estimate parameters of electromagnetic waves based on the multi-component measurements of the DEMETER spacecraft. Using the fact that the wave magnetic field is perpendicular to the wave vector, the wave normal direction can be estimated by different methods. We use these plane-wave estimates to interpret measurements of the observed wave emissions. For instance, we use the recently developed singular value decomposition (SVD) technique. The results of the plane-wave analysis have an advantage that they often allow a straightforward interpretation. These different methods have been successfully tested with the data of previous spacecraft. All these methods are also implemented in the analysis tools designed for the analysis of the DEMETER wave measurements. We show the first results of these analysis techniques for different types of wave emissions observed on board DEMETER. Obliquely propagating right-hand polarized electromagnetic waves at a few hundreds of Hz are usually connected with a multi-ion mode structure below the local proton cyclotron frequency and with a sharp lower cutoff of left-hand polarized waves, as well as with right-hand polarized waves tunelling below the multi-ion cross-over frequency. Electron and proton whistlers are also very frequently observed on DEMETER. An unusual narrow-band emission at 140 Hz (well below the local proton cyclotron frequency) serves us as another case for a detailed analysis. We find that these waves are right-hand polarized and obliquely propagating. Using this example case, we also present analysis methods to estimate continuous distribution of wave energy density as a function of wave vector directions. These techniques of wave distribution function (WDF) analysis need both wave and particle measurements. In the analyzed case, two different methods of WDF analysis give similar results consistent with the results of the plane-wave techniques. To identify the source region we use the backward ray-tracing method. The wave normal direction obtained by the analysis of multicomponent data is used for a simulation of wave propagation from the point of measurement. By this procedure, we obtain an inverse trajectory of the wave ray. We can thus follow the ray path back to the anticipated source region which is in our case located a few degrees of latitude to the South from the spacecraft position. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:512 / 527
页数:16
相关论文
共 51 条
[1]   COMPARATIVE-STUDY OF 3 TECHNIQUES FOR USING SPECTRAL MATRIX IN WAVE ANALYSIS [J].
ARTHUR, CW ;
MCPHERRON, RL ;
MEANS, JD .
RADIO SCIENCE, 1976, 11 (10) :833-845
[2]   LOCALIZATION OF SOURCES OF ELF-VLF HISS OBSERVED IN THE MAGNETOSPHERE - 3-DIMENSIONAL RAY TRACING [J].
CAIRO, L ;
LEFEUVRE, F .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1986, 91 (A4) :4352-4364
[3]   First results obtained by the Cluster STAFF experiment [J].
Cornilleau-Wehrlin, N ;
Chanteur, G ;
Perraut, S ;
Rezeau, L ;
Robert, P ;
Roux, A ;
de Villedary, C ;
Canul, P ;
Maksimovic, M ;
de Conchy, Y ;
Hubert, D ;
Lacombe, C ;
Lefeuvre, F ;
Parrot, M ;
Pinçon, JL ;
Décréau, PME ;
Harvey, CC ;
Louarn, P ;
Santolik, O ;
Alleyne, HSC ;
Roth, M ;
Chust, T ;
Le Contel, O .
ANNALES GEOPHYSICAE, 2003, 21 (02) :437-456
[4]   MAXENTWDF - A COMPUTER-PROGRAM FOR THE MAXIMUM-ENTROPY ESTIMATION OF A WAVE DISTRIBUTION FUNCTION [J].
DELANNOY, C ;
LEFEUVRE, F .
COMPUTER PHYSICS COMMUNICATIONS, 1986, 40 (2-3) :389-419
[5]  
GRARD R, 1968, ANN GEOPHYS, V24, P955
[6]   ION CYCLOTRON WHISTLERS [J].
GURNETT, DA ;
SHAWHAN, SD ;
BRICE, NM ;
SMITH, RL .
JOURNAL OF GEOPHYSICAL RESEARCH, 1965, 70 (07) :1665-+
[7]   LOW-FREQUENCY CUTOFF OF ELF EMISSIONS [J].
GURNETT, DA ;
BURNS, TB .
JOURNAL OF GEOPHYSICAL RESEARCH, 1968, 73 (23) :7437-+
[8]  
HAYATA K, 1987, ELECTRON LETT, V23, P251
[9]  
Helliwell R.A., 1965, Whistlers and related ionospheric phenomena
[10]   POYNTING VECTOR MEASUREMENTS OF ELECTROMAGNETIC ION-CYCLOTRON WAVES IN THE PLASMASPHERE [J].
LABELLE, J ;
TREUMANN, RA .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1992, 97 (A9) :13789-13797