my vision of chapter 2: kink oscillations and waves in the corona” … · 2019. 10. 18. ·...
TRANSCRIPT
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Centre for Fusion, Space & Astrophysics
Valery M NakariakovUniversity of Warwick, UK
My vision of Chapter 2: "Kink oscillations and waves in the corona”
ISSI-Bj, China, 14/10/2019, 9:15-9:30
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Centre for Fusion, Space & Astrophysics
Forward modelling and effects of LoS integration
• De Moortel & Pascoe, 2012ApJ...746...31D “The effects of line-of-sight integration on multistrand coronal loop oscillations”
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Centre for Fusion, Space & Astrophysics
5. Seismological estimation of the magnetic field:
• One of the specific aims of SDO/AIA
Nakariakov & Ofman, 2001A&A...372L..53N
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Centre for Fusion, Space & Astrophysics
Alternative mechanisms:
• Blast wave, e.g. McLaughlin & Ofman2008ApJ...682.1338M
• Upflows at footpoints, Zaitsev & Stepanov1989SvAL...15...66Z
• Collision of unsteady counter-streaming upflows along the loop
Antolin et al. 2018ApJ...861L..15A
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Centre for Fusion, Space & Astrophysicsx, arcsec
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Loca
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Comprehensive catalogues:
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Centre for Fusion, Space & Astrophysics
Amplitude, Mm0 15 25
Num
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Period, min0 15 25
Num
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Looplength, Mm0 100 300 500 700
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Centre for Fusion, Space & Astrophysics
Ck, km/sec0 500 1500 2500 3500
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combined datanew data
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Centre for Fusion, Space & AstrophysicsAmplitude, Mm
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Amplitude, Mm100 101
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Is the damping a nonlinear process?
Apparent
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Centre for Fusion, Space & Astrophysics
Seismology of a “quiet” active region by decaylessoscillations
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Centre for Fusion, Space & Astrophysics
Thus, f(t) cannot be periodic: no signature of resonance.
BTW, how is it consistent with the claimed detection of kink waves propagating from the chromosphere to the corona??
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Centre for Fusion, Space & Astrophysics
In a self-sustained oscillator (self-oscillator), the driving force is controlled by the oscillation itself so that it acts in phase with the velocity, causing a negative damping that feeds energy into the vibration:
no external rate needs to be adjusted to the resonant frequency.
Examples:• Heart,• Clocks,• Bowed and wind musical instruments,• Devices that convert DC in AC.
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Centre for Fusion, Space & Astrophysics
Sketch of our model of undamped kink oscillations of loops:
Loops
Quasi-steady flows (supergranulation?)
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Centre for Fusion, Space & Astrophysics
Conclusions• Appearance of large-amplitude rapidly-damped
kink oscillations is associated with low coronal eruptions (LCE).
• Possible excitation mechanism is the mechanical displacement of the loop from the equilibrium by the LCE (observed in 86% cases).
• Some cases are clearly inconsistent with this mechanism.
• Evidence of nonlinear damping: the quality-factor depends on the oscillation amplitude.
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Centre for Fusion, Space & Astrophysics
Conclusions - 2• There is another, decayless and low-amplitude
regime of the oscillations.• The period also depends on the loop length.• Seismology during quiet periods.• The amplitude does not depend on period.• Are decayless oscillations self-oscillations?