The Solar Polar Field Reversal Observed By SOHO/MDI Yang Liu, J. Todd Hoeksema, X-P Zhao – Stanford University

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Presentation transcript:

The Solar Polar Field Reversal Observed By SOHO/MDI Yang Liu, J. Todd Hoeksema, X-P Zhao – Stanford University

Outline Show reversal of polar field based on observational data; Show reversal of polar field based on observational data; Show evolution of large-scale magnetic field during solar cycle, especially in the period of polar field reversal; Show evolution of large-scale magnetic field during solar cycle, especially in the period of polar field reversal; Discuss change of the heliospheric magnetic field during polar field reversal. Discuss change of the heliospheric magnetic field during polar field reversal.

Magnetic field viewed from north pole

Magnetic field viewed from south pole

Polar field reversal (?)

Modeling polar field Polar field model: Solar minimum Solar maximum

Heliospheric field CR1960 (02/ /2000) CR1975 (04/ /2001)

Coronal/Heliospheric fields

Coronal field during solar cycle

Interplanetary Magnetic Field (model & obs)

Summary Polar field reversal of cycle 23 occurred in The southern polar field reversed 10 month later than that of north polar field. Polar field reversal of cycle 23 occurred in The southern polar field reversed 10 month later than that of north polar field.