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Relationship Between Solar Wind Speed and Coronal Magnetic Field Properties  

Ken'ichi Fujiki   Submitted: 2015-07-13 18:37

We have studied the relationship between the solar-wind speed [V] and the coronal magnetic-field properties (a flux expansion factor [f] and photospheric magnetic-field strength [Bs]) at all latitudes using data of interplanetary scintillation and solar magnetic field obtained for 24 years from 1986 to 2009. Using a cross-correlation analyses, we verified that V is inversely proportional to f and found that V tends to increase with Bs if f is the same. As a consequence, we find that V has extremely good linear correlation with Bs/f. However, this linear relation of V and Bs/f cannot be used for predicting the solar-wind velocity without information on the solar-wind mass flux. We discuss why the inverse relation between V and f has been successfully used for solar-wind velocity prediction, even though it does not explicitly include the mass flux and magnetic-field strength, which are important physical parameters for solar-wind acceleration.

Authors: Ken'ichi Fujiki, Munetoshi Tokumaru, Tomoya Iju, Kazuyuki Hakamada, Masayoshi Kojima
Projects: None

Publication Status: Solar Physics (accepted)
Last Modified: 2015-07-15 13:21
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