Spicule observed in He 10830 Å

1. Spicule observed in He 10830 Å Solar seminar in 2009 April 20 Short : Tetsu Anan HAZEL 1, Bueno et al. 2005 2, 3, Nuño et al. 2007

2. HE10830 Nuño et al. 2007 • upper chromospheric spectral line • Multiplet line (triplet) • EUV coronal irradiation (λ<504Å) ionized the neutral helium , and recombination => (lower) level to be populated • collisional excitation & ionization RED COMPONENT BLUE COMPONENT

3. HE10830 He 1082.91 Ca 1083.34 H2O 1083.80 He 1083.03 Na 1083.49 H2O 1083.21 H2O 1083.21 Si 1082.71 Sunspot observed at DST in Hida observtory

4. Diagnostic for investigating the magnetism in He 10830 Zeeman splitting => good!! in He 10830 * circular polarization for line-of-sight B ∝ B * linear polarization for perpendicular line-of-sight∝ B^2negligible for perpendicular line-of-sight B < 100G Hanle effect Weak B rotated and modify the direction of unmagnetized linear scattering polarization (population imbalances) B in Gauss λ in Å Bueno et al. 2005 (Tujillo Bueno, Asensio Ramos,,,) : diagnostic tool (Hanle, Zeeman, Paschen-Back ) HAZEL I studied at Hanle effect workshop in this spiring from Mr. Katsukawa

5. Model & coordinate HAZEL Slab model • Constant property slab • Background light is unpolarized anisotropic continuum radiation =>population balance, source function, absorption coefficient • neglect collision • optical thickness is τ τ height local coordinate for B B：magnetic field strength θB： incrination χB: azimuth

6. parameter HAZEL Height

7. Inversion HAZEL

8. HAZEL problem • Linear polarization of the 10830 Å is sensitive (via the upper level Hanle effect) to B = 0.1〜10Gtlife=life time (in seconds) of the given atomic levelg=Lande factorB >10G We can get only θB,χBfrom linear polarizationB⊥ from circular polarization (Zeeman effect)=> B • Constant property • Van-Vleck ambiguity => There are an angle having no atomic polarization • 180°ambiguity

9. Local cordinate Off-limb observation θ=90° χ=0° γ=90° +Q

10. Van-Vleck angle • 90°scattering • B const.

11. For example of ambiguity from Mr Katukawa’s presentation file Offlimb_00 azimuth inclination Χ square distribution map Red point is answer B constant Θ [5°]

12. For example of ambiguity from Mr Katukawa’s presentation file Offlimb_01 azimuth inclination Χ square distribution map Red point is answer B constant Θ [5°]

13. For example of ambiguity from Mr Katukawa’s presentation file Offlimb_04 azimuth inclination Χ square distribution map Red point is answer B constant Θ [5°]

14. For example of ambiguity from Mr Katukawa’s presentation file Offlimb_02 azimuth inclination Χ square distribution map Red point is answer B constant Θ [5°]

15. For example of ambiguity from Mr Katukawa’s presentation file Offlimb_06 azimuth inclination Χ square distribution map Red point is answer B constant Θ [5°]

16. Bueno et al. 2005 Spicule is • Chromospheric small jets • Velocity ~ 25 km/sec (≈ sound velocity ≈ Alfven velocity ≈10km/sec) • Height ≈ 6000~10000km • Width ≈ 800 km

17. Observation • Tenerife Infrared Polarimeter mounted on the German Vacum Tower Telescope at the Observatorio del Teide • 2001 May 10 • 50 consecutive images(expo.=100ms) Bueno et al. 2005 Nuño et al. 2007 • 2005 December 4 • 10 consecutive images(expo.=250ms) • 11mÅ/px

18. B of off-limb spicule Bueno et al. 2005 • Height 2000km • U signal => Hanle effect∵scatter polarization => Q • B ≈10G • θB ≈ 37° • χB ≈ 173° • thermal velocity 13.5 km/s • artificially enhancing the damping parameter • Optically thick model red circle：caused by the presence of a significant amount of atomic polarization in the ground level Open circle：observed stokes profile Solid line：theoretical modeling

19. That all