Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.5194/angeo-22-2497-2004 |
The structure of high altitude O+ energization and outflow: a case study | |
Nilsson, H; Joko, S; Lundin, R; Reme, H; Sauvaud, JA; Dandouras, I; Balogh, A; Carr, C; Kistler, LM; Klecker, B; Carlson, CW; Bavassano-Cattaneo, MB; Korth, A | |
通讯作者 | Nilsson, H |
会议名称 | Meeting on Spatio-Temporal Analysis and Multipoint Measurements in Space |
会议日期 | MAY 12-16, 2003 |
会议地点 | Orleans, FRANCE |
英文摘要 | Multi-spacecraft observations from the CIS ion spectrometers on board the Cluster spacecraft have been used to study the structure of high-altitude oxygen ion energization and outflow. A case study taken from 12 April 2004 is discussed in more detail. In this case the spacecraft crossed the polar cap, mantle and high-altitude cusp region at altitudes between 4 R-E and 8 R-E and 2 of the spacecraft provided data. The oxygen ions were seen as a beam with narrow energy distribution, and increasing field-aligned velocity and temperature at higher altitude further in the upstream flow direction. The peak O+ energy was typically just above the highest energy of observed protons. The observed energies reached the upper limit of the CIS ion spectrometer, i.e. 38 keV. Moment data from the spacecraft have been cross-correlated to determine cross-correlation coefficients, as well as the phase delay between the spacecraft. Structures in ion density, temperature and field-aligned flow appear to drift with the observed field-perpendicular drift. This, together with a velocity dispersion analysis, indicates that much of the structure can be explained by transverse heating well below the spacecraft. However, temperature isotropy and the particle flux as a function of field-aligned velocity are inconsistent with a single altitude Maxwellian source. Heating over extended altitude intervals, possibly all the way up to the observation point, seem consistent with the observations. |
英文关键词 | magnetospheric physics magnetopause, cusp, arid boundary layers magnetosphere-ionosphere interactions |
来源出版物 | ANNALES GEOPHYSICAE |
ISSN | 0992-7689 |
EISSN | 1432-0576 |
出版年 | 2004 |
卷号 | 22 |
期号 | 7 |
页码 | 2497-2506 |
出版者 | COPERNICUS GESELLSCHAFT MBH |
类型 | Article;Proceedings Paper |
语种 | 英语 |
国家 | Sweden;France;England;USA;Germany;Italy |
收录类别 | SCI-E ; CPCI-S |
WOS记录号 | WOS:000223620300021 |
WOS关键词 | HIGH-LATITUDE IONOSPHERE ; DAYSIDE CUSP/CLEFT ; POLAR-CAP ; IONS ; ACCELERATION ; PLASMA ; BEAMS ; CUSP ; MAGNETOSPHERE ; BOUNDARY |
WOS类目 | Astronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/294763 |
作者单位 | (1)Swedish Inst Space Phys, S-98128 Kiruna, Sweden;(2)Ctr Etud Spatiale Rayonnements, Toulouse, France;(3)Univ London Imperial Coll Sci Technol & Med, London, England;(4)Univ New Hampshire, Durham, NH 03824 USA;(5)Max Planck Inst Extraterr Phys, D-37075 Garching, Germany;(6)Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA;(7)Ist Fis Spazio Interplanetario, Rome, Italy;(8)Max Planck Inst Aeron, Katlenburg Lindau, Germany |
推荐引用方式 GB/T 7714 | Nilsson, H,Joko, S,Lundin, R,et al. The structure of high altitude O+ energization and outflow: a case study[C]:COPERNICUS GESELLSCHAFT MBH,2004:2497-2506. |
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