EISCAT measurements of solar wind velocity and the associated level of interplanetary scintillation

被引：16
|
作者：
Fallows, RA [1 ]
Williams, PJS [1 ]
Breen, AR [1 ]
机构：
[1] Univ Wales, Dept Phys, Aberystwyth SY23 3BZ, Dyfed, Wales
来源：
ANNALES GEOPHYSICAE | 2002年 / 20卷 / 09期
关键词：
interplanetary physics; solar wind plasma;
D O I：
10.5194/angeo-20-1279-2002
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A relative scintillation index can be derived from EISCAT observations of Interplanetary Scintillation (IPS) usually used to study the solar wind velocity. This provides an ideal opportunity to compare reliable measurements of the solar wind velocity derived for a number of points along the line-of-sight with measurements of the overall level of scintillation. By selecting those occasions where either slow- or fast-stream scattering was dominant, it is shown that at distances from the Sun greater than 30 RS, in both cases the scintillation index fell with increasing distance as a simple power law, typically as R-1.7. The level of scintillation for slow-stream scattering is found to be 2.3 times the level for fast-stream scattering.
引用
收藏
页码：1279 / 1289
页数：11
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