通量堆积和偶极化过程中的超低频波动
The ULF wave in the pile-up and dipolarization process
查看参考文献20篇
文摘
|
2004年9月17日TC-1卫星在近地磁尾夜侧观测到一次伴随有通量堆积和偶极化过程的典型亚暴事件.本文利用离散小波分析和FFT分析方法对本次事件中4s精度的FGM和HIA数据进行分析,以了解通量堆积过程和偶极化过程中的低频波特性.分析结果表明,通量堆积过程和偶极化过程中场和粒子有明显的不规则低频波动,主要波动频率范围为4~15mHz,和Pi-2脉动一致.通量堆积过程中磁场各个分量的低频波动和偶极化过程中的低频波动有明显不同,表明这两个物理过程可能存在不同的波动机制.在通量堆积过程和偶极化过程中,平行磁场方向上温度和速度的波动和垂直方向上温度和速度的波动有明显区别,平行磁场方向上温度和速度的波动有较好的相关性,且热离子密度的波动和平行磁场方向上的波动有较好的相关性,表明存在快模压缩波.TC-1卫星的观测显示通量堆积过程中磁场By分量有明显增长.我们的分析结果表明ULF波与By分量的增长有密切关系,从而可能对亚暴膨胀相的触发有重要影响. |
其他语种文摘
|
Abstract A typical substorm process in the night-side near-Earth magnetotail company with the pile-up and depolarization process explored by TC-1 on sep 17, 2004. We analyzed the FGM and HIA data(4s resolution) with wavelet and FFT analysis method to understand the low-frequency wave in the pile-up and dipolarization process. The analysis results showed that there are distinctly irregular low frequency wave in the pile-up and dipolarization process, the main range of the wave frequency is 4-15 mHz, coincident with the Pi-2 pulse. The LF wave of the each magnetic field component in the dipoarization process is distinctly different with that in the pileup process. During the pileup and dipolarization process, the wave of the temperature and velocity in the direction parallel to the magnetic field is distinctly with that in the direction perpendicular to the magnetic field. It seems the wave of the temperature and velocity in the direction parallel to the magnetic field has good correlation, and the wave of the ions density has good correlation with the wave in the direction parallel to the magnetic field, which means there exist compressive wave in the direction parallel the magnetic field. The exploration by the TC-1 showed that there are distinct increase of the By component in the pile-up process. The ULF wave has closely correlation with increase By component, and may has important effect of the substorm onset. |
来源
|
地球物理学报
,2008,51(5):1285-1295 【核心库】
|
关键词
|
通量堆积
;
偶极化过程
;
膨胀相触发
;
超低频波(ULF)
|
地址
|
1.
中央民族大学物理与电子工程学院, 北京, 100081
2.
中国科学院空间科学与应用研究中心, 空间天气学国家重点实验室, 北京, 100080
3.
浙江大学聚变理论与模拟中心, 浙江, 杭州, 310027
4.
北京大学现代教育技术中心, 北京, 100871
|
语种
|
中文 |
文献类型
|
研究性论文 |
ISSN
|
0001-5733 |
学科
|
地球物理学 |
基金
|
国家自然科学基金青年科学基金
;
国家自然科学基金重点项目(40620130094)和国家重点实验室项目(9140C08060107ZCZJ12)联合资助
|
文献收藏号
|
CSCD:3387438
|
参考文献 共
20
共1页
|
1.
Baumjohann W. Substorm dipolarization and recovery.
Geophys Res,1999,104:24995-25000
|
被引
13
次
|
|
|
|
2.
Shiokawa K. High-speed ion flow substorm current edge and multiple Pi2 pulsations.
J Geophys Res,1998,103:4491-4507
|
被引
15
次
|
|
|
|
3.
Sigsbee K. Geotail observations of low-requency waves and high-speed earthward flows during substorm onsets in the near agnetotail from 10 to 13 R《 E》.
J Geophys Res,2002,107:1141-1149
|
被引
1
次
|
|
|
|
4.
Higuchi Y. Pil magnetic pulsations observed in association with low latitude urora.
J Geomag Geoelectr,1994,46:177-192
|
被引
1
次
|
|
|
|
5.
Roux A. Plasma sheet instability related to the estward traveling surge.
J Geophys Res,1991,96:17697-17705
|
被引
4
次
|
|
|
|
6.
Pu Z Y. MHD drift instability near the inner edge of he NECS and its application to substorm onset.
J Geophys Res,1997,102:14397
|
被引
7
次
|
|
|
|
7.
Shiokawa K. Decrease in Bz prior to the dipolarizaiton in the ear-Earth plasma sheet.
J Geophys Res,2005,110:1029
|
被引
1
次
|
|
|
|
8.
Samson J C. Proton aurora and substorm ntensifications.
Geophys Res Lett,1992,19:2167-2170
|
被引
1
次
|
|
|
|
9.
Zhang H. TC-1 observations of flux pileup and polarizations-associated expansion in the nearearth magnetotail during ubsotorms.
Geophys Res Lett,2007,34:1029
|
被引
1
次
|
|
|
|
10.
曹馨. 一次磁层亚暴期间磁场偶极化的尾向传播.
地球物理学报,2007,50(4):995-1004
|
被引
2
次
|
|
|
|
11.
Nose M. Automated detection of Pi2 pulsations using wavelet analysis:1Ethod nd application for substorm monitoring.
Earth Planets Space,1998,50:773-783
|
被引
1
次
|
|
|
|
12.
Nose M. Automated detection of Pi2 pulsations using wavelet analysis:2 An pplication for dayside Pi2 pulsation study.
Earth Planets Space,1999,51:23-32
|
被引
1
次
|
|
|
|
13.
Yumoto K. Generation and propagation mechanisms of lowlatitude magnetic ulsations-A review.
J Geophys,1986,60:79-105
|
被引
1
次
|
|
|
|
14.
Heacock R. Two subtypes of Pi micropulsations.
J Geophys Res,1967,72:3905-911
|
被引
1
次
|
|
|
|
15.
Sutcliffe P R. A comparison of Pi2 pulsations observed by CHAMP in low arth orbit and in the ground at low latitudes.
GeophysRes Lett,2003,10:1029
|
被引
1
次
|
|
|
|
16.
Nose M.
Nowcasting of substorm onsets by detecting i2 pulsations with wavelet analysis Solar-Terrestrial Predictions Workshop 96,1996
|
被引
1
次
|
|
|
|
17.
Takahashi K. Statistical analysis of Pi2 pulsations bserved by the AMPTE CCE spacecraft in the inner magnetosphere.
J Geophys Res,1995,100:21929-21941
|
被引
1
次
|
|
|
|
18.
Shiokawa K. Braking of high-speed flows in the ear-earth tail.
Geophys Res Lett,1997,24:1179-1182
|
被引
26
次
|
|
|
|
19.
Birn and Hesse. Details of current disruption and diversion in simulations of agnetotail dynamics.
J Geophys Res,1996,24:1179-1187
|
被引
1
次
|
|
|
|
20.
Lui A T Y. Current disruption in the near-earth eutral sheet region J.
Geophys Res,1992,97:1461-1480
|
被引
2
次
|
|
|
|
|