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

International audience 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 po...

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Bibliographic Details
Main Authors: Fallows, R. A., Williams, P. J. S., Breen, A. R.
Other Authors: Department of Physics Aberystwyth, Aberystwyth University
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2002
Subjects:
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
EISCAT
Online Access:https://hal.science/hal-00317122
https://hal.science/hal-00317122/document
https://hal.science/hal-00317122/file/angeo-20-1279-2002.pdf
Description
Summary:International audience 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 R S , 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.

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