1 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet The Unusual Heliospheric Current Sheet at the End of Cycle 23 A Comparison of Cycles 21,22,& 23.

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Presentation transcript:

1 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet The Unusual Heliospheric Current Sheet at the End of Cycle 23 A Comparison of Cycles 21,22,& 23 J. Todd Hoeksema Stanford University

2 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Comparison of Solar Cycles 21 – 22 – 23 – Consistent observations from WSO since 1976 – the beginning of Cycle 21 Typical evolution of model heliospheric current sheet follows pattern through cycle Minimum HCS resembles dipole – until now

3 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Potential Field – Source Surface Simple Model of Coronal Field Carrington Rotation 1912 – August 1996 Whole Sun Month – Elephant’s Trunk

4 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Typical Solar Cycle – 22 Minimum 1986 Rising 1988 Max & Polar Reversal 1989 Early Decline 1991 Later Decline 1993 Pre-Min 1995

5 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Solar Cycle Every 8 th Rotation X2 CR

6 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Solar Cycle Every 8 th Rotation X2 CR

7 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Solar Cycle Every 8 th Rotation X2 CR

8 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Comparison of Cycles 21 & 22 Every 9 th Rotation X – 1986 CR 1650 – – 1996 CR 1790 – 1916

9 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Comparison of Cycles 22 & 23 Every 9 th Rotation X – 1996 CR 1790 – – 2006 CR

10 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Comparison of Cycles 21 & 23 Every 9 th Rotation X – 1986 CR 1645 – – 2006 CR 1920 – 2046

11 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Comparison of Minima at Start of Cycles – Cycle – Cycle – Cycle – Cycle 23.95(?)

12 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet

13 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Polar Field Measured at WSO from

14 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet Summary Each solar cycle follows a similar pattern of evolution Each cycle shows different features depending on AR emergence Polar field dominates minimum Polar field at end of Cycle 23 is very weak HCS reaches higher latitude and has more structure in 2007 than expected

15 July 31, 2007 SHINE 2007 – Heliospheric Plasma Sheet North Polar Field Strength