Solar flares, magnetars, and helioseismology - PowerPoint PPT Presentation

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Solar flares, magnetars, and helioseismology

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HE astrophysicists tell helioseismologists where the flare ... Gallagher, P. personal communication 2004. Stanford, January 27 2005. Archive cartoon from ... – PowerPoint PPT presentation

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Title: Solar flares, magnetars, and helioseismology


1
Solar flares, magnetars, and helioseismology
  • H.S. Hudson
  • SSL/UCB

2
Outline
  • Working concept for flare physics
  • Missing knowledge in the deep atmosphere
  • Nature of impulse
  • Magnetar behavior

3
Overlapping needs
  • HE astrophysicists tell helioseismologists where
    the flare impulse happens
  • Helioseismologists tell HE astrophysicists what
    sunspot magnetic fields above and below t5000 1
    must be like

4
Schrijver et al., Solar Phys. 206, 69, 2002
5
Four things the TRACE movie showed
  • Early inward motions, prior to the eruption
  • Dimming - the CME starting off
  • Excitation of coupled normal modes in the arcade
  • Arcade blowout
  • But mainly, that the energy release is COMPACT
    and BRIEF

6
Forbes, T., JGR 105, 23,153, 2000
Gallagher, P. personal communication 2004
7
Archive cartoon from Gurman, 1987 - shows HE
region nicely
P0 g-rays, magnetar g-rays, below t 1
8
Particle model uncertainties
  • What is the source?
  • Propagation at depth B Pd
    (not divergence-free!)
  • Ad-hoc assumption about wave distribution (for
    pitch-angle scattering)

9
MDI magnetic artifacts (D. Brown) show locations
of particle precipitation in October 28, 2003
flare?
10
Energy and momentum
  • Cross-sections and difficulty of inference
  • Total energies in particles
  • Recall Lin Hudson 1976 (or Kane Donnelly
    1971) energetic electrons may contain the total
    flare energy after B2/8p

11
Ramaty et al., ApJ 455, 193, 1995 protons can
rival electrons for total energy
12
Bremsstrahlung
Nuclear excitation
s
Bad
Bad
E
E
13
Flare/Magnetar comparison
  • Flare impulse via particles above photosphere,
    1032 ergs, localized, extended in time
  • Magnetar impulse via g-rays below photosphere,
    1022 ergs, distributed across hemisphere, 0.2 s
    duration

14
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