Some Thoughts on Transients: Buildup

1
Some Thoughts on Transients Buildup Release
of Energy

• David E. McKenzie, Montana State
  UniversityBozeman

HMI/AIA Science Team Meeting
Monterey, February 13, 2006
2
Emergence

• Schrijver et al. (2005) 71 of non-potential
  active regions studied had new flux emerging at
  the time, often associated with shearing motions
• Emergence of new field near pre-existing field
  (e.g., active regions, filaments) frequently
  precedes eruption
• Filament activation
• CMEs
• Jets

Temperatures All esp. low-T
Resolution Want high res.
Cadence Faster is better
Continuity Some gaps acceptable
HMI/AIA Science Team Meeting
Monterey, February 13, 2006
3
Helicity

• Not spinning eruption movies
• Emergence?
• Transfer (a la Canfield Reardon)
• Sigmoids
• Associated with eruptions
• Approach instability via helicity transfer
  (Glover et al., Canfield et al.)

Temperatures High-T especially
Resolution Full-res for transfer else?
Cadence Faster is better
Continuity Some gaps acceptable?
HMI/AIA Science Team Meeting
Monterey, February 13, 2006
4
Buildup

• Schrijver et al. nonpotentiality persists for
  hours
• Longcope et al. (2005) Delay of 24 hours
  before significant reconnection between active
  regions
• Without delay, no stress to be released?
• What determines length of delay, or even if there
  is a delay?

Heating 5 x 1026 erg/sec
Temperatures All
Resolution Need high-res
Cadence 5 minutes
Continuity No gaps longer than 90 min
Reconnn burst 1017 Mx/sec
24 hour delay
HMI/AIA Science Team Meeting
Monterey, February 13, 2006
5
CME Release

• Tether cutting
• Breakout
• Other?
• What determines?

Temperatures High-T especially
Resolution Want high res.
Cadence Faster is better
Continuity Some gaps okay? Get preflare data
HMI/AIA Science Team Meeting
Monterey, February 13, 2006
6
Inflows

• Yokoyama et al. 5 km/s
• Narukage Shibata 5-6 more
• Looks just like the 2D model

Temperatures High-T especially
Resolution Not crucial 2x2 binning okay
Cadence Faster is better
Continuity Want preflare images
HMI/AIA Science Team Meeting
Monterey, February 13, 2006
7
Patches in Reconnection

• Downflows, as shrinking reconnected flux tubes,
  indicate 3D patchy reconnection
• Linton Longcope (2006) model of patchy
  reconnection produces teardrop-shaped outflows
• How much flux per episode
• Downflows give an answer 4 ? 1018 Mx
• Longcope et al, model observations also gives 4
  ? 1018 Mx

Temperatures High-T
Resolution Want full-res at least sometimes
Cadence Faster is better
Continuity Some gaps acceptable
HMI/AIA Science Team Meeting
Monterey, February 13, 2006