n. a. schwadron u . new hampshire
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Solar Wind and Coronal Electron Temperature in the Protracted Solar Minimum, the Cycle 24 Mini Maximum, and Over Centuries. N. A. Schwadron U . New Hampshire. a. Background - Ulysses. McComas et al., ApJ , 2013. Protracted Min (23) and Mini Max (24). Dropping solar wind Flux Pressure - PowerPoint PPT PresentationTRANSCRIPT
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N. A. SchwadronU. New Hampshire
Solar Wind and Coronal Electron Temperature in
the Protracted Solar Minimum, the Cycle 24
Mini Maximum, and Over Centuries
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Solar Probe PlusA NASA Mission to Touch the
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a
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Background - Ulysses
McComas et al., ApJ, 2013
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Protracted Min (23) and Mini Max (24)
• Dropping solar wind• Flux• Pressure• Magnetic Field
• Continues trend observed by Ulysses
McComas et al., ApJ, 2013
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Energy-per-particle fixed from the Source
Schwadron et al., 2008
Pevtsov et al., 2003
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Correlated Reduction in Ram Pressure and Magnetic FLux
McComas et al., ApJ, 2013
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Reductions in Magnetic Field & SSN
• SSN (black)• Predicted (red)• OMNI (blue)• 10Be (green)• Magnetic Flux Balance
(Schwadron et al.,, 2010)
Goelzer et al., ApJ, 2013
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A
Alfven Radius in the Mini Maximum
Goelzer et al., JGR, 2014
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Significantly worsening space environment in Cycle 24
Schwadron et al., 2014
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B. U. Colloquium, Feb 2008
Paths of deposited Energy
Schw
adro
n an
d M
cCom
as, A
pJ, 2
003
• Solar Wind Scaling Law
• Electron heat conduction and radiative losses
Fast windCool, Dark
Slow windWarm,Brighter
Radiative LossHot, Bright
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Scaling Law Model - THEN
Only free parameter is expansion factor= 6.2 taken here
Similar to 5.8 expansion factor found by Munro & Jackson [1977]
Maps to 8-12 G fields
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Scaling Law Model - NOW
Not Observed rise in coronal temperature in cycle 24
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Cycle 24 Decay in Coronal Temp
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Historic Period – Dalton-like
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Conclusions
Protracted Cycle 23 and Mini Max of 24 historic periods of low activity
Affect acting across all/most elements of system
Further more stringent test of coronal scaling law
Weak effect on Alfven radiusWorsening Radiation Environment
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