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Manifestation of KG Magnetic Elements on the Sun: Observations with Low Spatial Resolution

Explore the uniqueness of KG magnetic elements on the Sun through low-resolution observations. Compare data from various instruments, discuss challenges in diagnostics, and emphasize the relevance for stellar mapping codes. New experimental data are needed for precise interpretations.

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Manifestation of KG Magnetic Elements on the Sun: Observations with Low Spatial Resolution

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  1. ON THE PECULIARITIES OF MANIFESTATION OF kG MAGNETIC ELEMENTS IN OBSERVATIONS OF THE SUN WITH LOW SPATIAL RESOLUTION Misha Demidov, R.M.Veretsky, A.V.Kiselev Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia 04 December, 2014 IAU Symposium 305, Punta Leona, Costa Rica

  2. OUTLINE • Introduction. Motivation. • Stokes-meter SMMF and LSMF measurements at SSO. Comparison with other data. • The role of the Sun for stellar astronomers. • Problems of multi-lines diagnostics of the LSMF measurements. • Spatial and temporal variations of MSR. • Theoretical interpretation • Conclusions

  3. Comparison o f the STOP, SOLIS, WSO, SDO/HMI magnetograms. Date 01 July 2014.

  4. Courtesy of K.Hayashi

  5. Example of multi-lines (N=14) observations of the quiet Sun magnetic field

  6. 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

  7. Balthasar, Demidov, Sol. Ph. 2012

  8. From Stenflo, Demidov, Bianda, Ramelli, A&A, 2013

  9. From Stenflo, Demidov, Bianda, Ramelli, A&A, 2013

  10. From Demidov, Stenflo, Bianda, Ramelli, SPW7, 2014

  11. Conclusions High-precision Stokes-meter observations of the Sun with low spatial resolution (LSR) are still scientifically important. Quasi-simultaneous observations of the Sun-as-a-star and LSMF can be used (WHEN !???...) for testing of stellar mapping codes. Multi-line observations of the Sun with LSR clearly show manifestation of the kG magnetic elements. CLV variations of the MSR and lines asymmetry show a good agreement only for the near disk center arears. New experimental data and theoretical modelling are necessary

  12. STOP synoptic maps for CR 2152-2155 (June-October, 2014).Courtesy of A.Tlatov

  13. Thank you!Gracias!

  14. Comparison of STOP SSO observations processed in “magnetograph”(left panel}and “Stokes-meter” (right panel) modes. We see one percent of polarization corresponds to ≈ 25 G.

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