conveners: joan feynman* and janet luhmann
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Recent ‘Unprecedented’ Weak Solar Wind: A solar glitch or a harbinger for the next Maunder minimum?. When: Wednesday AM. Session #1 Kickoff speakers: Heather Elliott, SWRI Dean Pesnell , GSFC. Conveners: Joan Feynman* and Janet Luhmann. - PowerPoint PPT PresentationTRANSCRIPT
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Recent ‘Unprecedented’ Weak Solar Wind: A solar glitch or a harbinger for the next Maunder
minimum?
Conveners: Joan Feynman* and Janet Luhmann
When: Wednesday AM. Session #1Kickoff speakers: Heather Elliott, SWRIDean Pesnell, GSFC
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The Longer Perspective is Keyin considering the present
From Wikipedia website
Why are we surprised?
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Ulysses found in-situ evidence of a wide band of low latitude/slow solar wind structure, together
with weak IMF and mass flux
From McComas et al., GRL 2008, also results from Ed Smith et al.
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C. Lee et al. compared recent L1 data with previous cycle data for a similar phase. OMNI V statistics are similar, but B and N lower
(C.O. Leeet al., Sol.Phys. 2009)
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..geomagnetic activity is reaching some all-time lows
NOAA SWPC website plot
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..The still lengthening minimum has led to downward adjusting predictions of the next maximum SSN
NOAA SWPC website plots combined in wattsupwiththat cycle 24 blog
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..on the Sun, weak polar fields have been an ongoing sign of something different going on
WSO data
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One outcome has been a more multipolar solar minimum corona
July 2009 eclipse(Eclipse Images and coronal models from PSI corona website. SOHO LASCO C2 image.)
October ‘95 eclipse
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Sputnik and Explorer 1 launched in 1957 and 1958 respectively, WSO began daily magnetic field observations in 1975, Mt. Wilson magneticfield data archives date from ~1970, etc. (Figure from NOAA SWPC)
But have we faced up to the fact that we have very limited cycle experience, space-age wise?
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..and not all predictions are on-board with the Maunder harbinger scenario
Hathaway NY times plot
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Over the long haul, even post-Maunder cycles have beensmaller than many ‘low’ predictions for cycle 24
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Nevertheless:
-This unusual cycle transition is revealing much about whatwe know and don’t know about everything from what makessolar cycles vary to what the many consequences are.
-What will be ‘unprecedented’ is the coming cycle behavior asa test of solar dynamo theories, and our ability to connect thedynamo with its heliospheric consequences.
-Even a healthy blog on this subject has been ongoing forseveral years ….
Don’t miss this ‘stellar’ opportunity to join the debate. ComeWed. AM to give your perspectives and share your knowledge.