1 / 49

Michael Demidov ISTP, Irkutsk, Russia Beijing, NAOC, 12 January, 2010

Multiline Stokes-metric Investigations of the Full-disk Solar Magnetic Fields: SIR Inversion Results and Applications to the SOHO/MDI Recalibration Issue. Michael Demidov ISTP, Irkutsk, Russia Beijing, NAOC, 12 January, 2010. Outline. Introduction Recent results of Ulrich et al. (2009)

lanza
Download Presentation

Michael Demidov ISTP, Irkutsk, Russia Beijing, NAOC, 12 January, 2010

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Multiline Stokes-metric Investigations of the Full-disk Solar Magnetic Fields: SIR Inversion Results and Applications to the SOHO/MDI Recalibration Issue Michael Demidov ISTP, Irkutsk, Russia Beijing, NAOC, 12 January, 2010

  2. Outline • Introduction • Recent results of Ulrich et al. (2009) • Stokes-meter FeI 523.3 nm – FeI 525.0 nm simultaneous observations • Preliminary results of SMAT (FeI 532.4) and STOP (FeI 525.0) quasi-simultaneous observations • Statistics analysis of 14 lines • Synthesis and inversion (SIR) results • Conclusions

  3. Howard, R., Stenflo, J.O. Sol.Ph. 22.1972 • Ulrich, R.K. PASP. 26. 1992 • Ulrich, R.K., et al., ApJS. 139. 2002 • Tran., T., et al., ApJS. 156. 2005. • Martinez Gonzalez, M.J., et al. A&A. 456. 2006 • Socas-Navarro, H., et al. ApJ. 674. 2008 • Demidov, M.L., et al., Sol.Ph. 250. 2008 • Ulrich, R.K., et al. Sol.Ph. 255, 2009

  4. From Tran, T. PhD Thesis, 2009

  5. Fig.1 from Ulrich et al.(2009)

  6. Fig. 3 from Ulrich et al.(2009)

  7. Fig. 13 from Ulrich et al.(2009)

  8. Ulrich et al.(2009) result “Using ρ as the center-to-limb angle (CLA), [...] scale factor is δ−1 = 4.15−2.82 sin2(ρ). Previouslyδ−1 = 4.5−2.5 sin2(ρ) had been used. The new calibration shows that magnetic fields measured by the MDI system on the SOHO spacecraft are equal to 0.619 ± 0.018 times the true value at a center-to-limb position 30◦”

  9. List of Spectral Lines N l El EP Lande factor 1 522.84 FeI 4.22 0.97 2 522.99 FeI 3.28 1.50 3 523.29 FeI 2.94 1.30 4 523.46 FeII 3.22 0.87 5 523.54 FeI 4.08 1.20 6 523.73 CrI 4.07 0.82 7 523.98 ScII 1.45 1.00 8 524.25 FeI 3.63 1.00 9 524.38 FeI 4.26 1.50 10 524.70 FeI 0.09 2.00 11 524.76 CrI 0.96 2.5 R 525.02 FeI 0.12 3.0 12 525.06 FeI 2.20 1.5 13 525.35 FeI 3.28 1.5

  10. Stokes I and Stokes V, FeI l523.3 nm

  11. Stokes I and Stokes V, FeI l525.0 nm, wide spectral range

  12. Stokes I and Stokes V, FeI l525.0 nm

  13. Stokes V, FeI l525.0 nm and FeI l523.3 nmm= 1.0, B525.0 = - 26.0 G

  14. Stokes V, FeI l525.0 nm and FeI l523.3 nmm= 0.56, B525.0 = 11.6 G

  15. RESULTS OF THE COMPARISON WITH DIFFERENT “SLIT” PARAMETERS Dl [pm] Slit width W [pm] r R = B(±8.5pm)/B(± Dl) ±15.53 24.82 0.991 1.271 ± 0.009 ±0.80.80 0.870 1.018 ± 0.028 ±3.1 1.55 0.977 1.073 ± 0.013 ±10.1 9.32 0.998 1.027 ± 0.003 ±17.8 9.32 0.935 1.528 ± 0.030

  16. Preliminary result byM.L.Demidov, H.Q.Zhang, X.F.Wang, R.M.Veretsky:

  17. STOP quasi-simultaneous observations in FeI 532.4 nm and FeI 525.0 nm. 10.01.2009

  18. Conclusions Conclusion 1. The revision of the SOHO/MDI data, based only on the comparison ofmagnetic field measurements in the line pair Fe I 523.3 nm and Fe I 525.0 nmis not obvious and new investigations are urgently needed. Conclusion 2. Application of the two-components inversion approach (SIR) to the many spectral lines simultaneously allows to reproduce observations results quite well. Conclusion 3. Interpretation of the CLVs of the MSR and other parameters in different combinations of spectral lines is still necessary. But this job need to be done in the future.

  19. Thank You! Спасибо!

More Related