Source: http://www.astrobulletin.univ.kiev.ua/55_lozitsky/
Timestamp: 2019-04-24 09:56:09+00:00

Document:
Spectral-polarized magnetic field measurements in solar flare of 28 October 2003 of Х17.2/4B class are compared in six FeI lines and in Нα line. Observations were carried out on Echelle spectrograph of horizontal solar telescope of Astronomical Observatory of Taras Shevchenko National University of Kyiv. Presented data relate to peak phase of flare and a place of photosphere outside sunspots where effective (average) magnetic field in FeI 6302.5 line was about 100 G and had S polarity. Measured splitting of emissive peaks in cores of strong FeI lines of 15th multiplet correspond to stronger fields, in range 550–700 G and S polarity too. Noticeablre splitting of emissive peaks (11–20 mÅ) were found also in Fe I 5434.527 line with effective Lande factor geff = –0.014. Value of this splitting and its sign indicate the existence of extremely strong fields of 25–50 kG of opposite (N) polarity which had negative Doppler velocities (lifting of plasma) on level of 1.7–2.2 km/sec. Magnetic field according to Нα line was 300 G and N polarity. Presented results indicate the essential inhomogeneity of magnetic field in flare volume which include the opposite polarities along the line of sight and wide range of effective magnetic fields.
1. Abramenko V. I. Flare-related changes in the profiles of six photospheric spectral lines / V. I. Abramenko, E. A. Baranovsky // Solar Phys., 2004. – Vol. 220, Iss. 1. – P. 81–91.
2. Photosphere model of 2N/2M solar flare: July 18, 2000 / E. S. Andriets, N. N. Kondrashova, E. V. Kurochka, V. G. Lozitsky // Bulletin of the Crimean Astrophysical Observatory, 2012. – Vol. 108, Iss. 1. – P. 1–3.
3. Baranovsky E. A. Modelling of photosphere and chromosphere of two powerful flares / E. A. Baranovsky, V. G. Lozitsky, V. P. Tarashchuk (28 Oct. 2003 and 1 Sept. 1990) (in rus.: Моделирование фотосферы и хромосферы двух мощных вспышек (28 окт. 2003 г. и 1 сент. 1990 г.)) // Kinematics and Physics of Celestial Bodies, 2009. – Vol. 25, No. 5. – P. 373–384.
4. Holweger H. The photospheric barium spectrum: solar abundance and collision of BaII lines by hydrogen / H. Holweger, E. H. Müller // Solar Phys., 1974. – Vol. 39, N 1. – P. 19–30.
5. Magnetic Fields in a Limb Flare on July 19, 2012 / E. A. Kirichek, A. A. Solov’ev, N. I. Lozitskaya, V. G. Lozitskii // Geomagnetism and Aeronomy, 2013. – Vol. 53, N 7. – P. 831–834.
6. Kurochka E. N. Temporary changes of physical conditions in photospheric layers of solar flare / E. N. Kurochka, V. G. Lozitsky, O. B. Osyka (in rus.: Временные изменения физических условий в фотосферных слоях солнечной вспышки) // Kinematics and Physics of Celestial Bodies, 2008. Vol. 24, N 4. – P. 308–320.
7. Kurochka E. V. Magnetic fields and thermodynamical conditions in the M6.4/3N solar flare on July 19, 2000 / E. V. Kurochka, V. G. Lozitsky // Kinematics and Physics of Celestial Bodies, Suppl., 2005, № 5. – P. 143–145.
8. Laba I. S. Proton flare 4В/X17.2 on the Sun of 28 October 2003. Results of phtotometry / I. S. Laba (in ukr.: Протонний спалах 4В/X17.2 на Сонці 28 жовтня 2003 р. Результати фотометрії) // Kinematics and Physics of Celestial Bodies, 2007. – Vol. 23, N 1. – P. 51–60.
9. Lozitsky V. G. Indications of 8-kilogauss magnetic field existence in the sunspot umbra / V. G. Lozitsky // Advances in Space Research. – 2016. – Vol. 57. – P. 398–407.
10. Lozitsky V. G. Magnetic fields anf FeI line profiles in the major solar flare on October 28, 2003 / V. G. Lozitsky // Astronomy Letter.– 2009.– Vol. 35, N 2.– P. 136–142.
11. Lozitsky V. G. Observational evidences to the 105 G magnetic fields in active regions on the Sun / V. G. Lozitsky (in ukr.: Спостережні свідчення магнітних полів напруженістю 105 Гс в активних областях Сонця) // J. of Phys. Studies, 2009. – Vol. 13, N 2. – P. 2903-1-2903-8.
12. Lozitsky V. G. Small-scale magnetic field diagnostics in solar flares using bisectors of I ± V profiles / V. G. Lozitsky // Advances in Space Research, 2015. – Vol. 55, Iss. 3. – P. 958–967.
13. Lozitsky V. G. Spectral manifestations of extremely strong magnetic fields in the sunspot umbra / V. G. Lozitsky // Advances in Space Research, 2017. – Vol. 59. – P. 1416–1424.
14. Observations of magnetic field evolution in a solar flare / V. G. Lozitsky, E. A.Baranovsky, N. I.Lozitska, U. M. Leiko // Solar Phys. – 2000. – Vol. 191, N 1. – P. 171–183.
15. Lozitsky V. G. Magnetic fields in limb solar flares / V. G. Lozitsky, N. I. Lozitska, O. A. Botygina (in rus.: Магнитные поля в лимбовых солнечных вспышках) // Astron. Tsirkular, 2013. – № 1594. – P. 1–6.
16. Lozitsky V. G. Observational evidences for extremely strong magnetic fields in solar flares / V. G. Lozitsky // Intern. Journ. of Astron. And Astrophys. – 2011. – V. 1, No. P. 147–154.
17. Moore Ch. E. The spectrum 2935 Å to 8770 Å. Second revision of Rowland’s Table of solar spectrum wave lengths / Ch. E. Moore, M. G. J. Minnaert, J. Houtgast // National Bureau of Standards Monograph 61, Iss. Dec. 1966, Printed with financ. assist. from UNESCO, under the auspices of IAU. – 349 p.
18. Piddington J. H. The flux-rope-fibre theory of solar magnetic fields / J. H. Piddington // Astrophysics and Space Sci., 1978. – Vol. 55, N 2. – P. 401–425.
19. Priest E. R. The magnetic nature of solar flares / E. R. Priest, T. G. Forbes // The Astronomy and Astrophysics Rev., 2002. – Iss. 4. – P. 313–377.
20. The Solar Optical Telescope for the Hinode Mission: An Overview / S. Tsuneta, K. Ichimoto, Y. Tatsukawa et al. // Solar Phys., 2008. – Vol. 249, № 2. – P. 167–196.
21. Peripheral Downflows in Sunspot Penumbrae / M. Van Noort, A. Lagg, S. K.Tiwari, S. K. Solanki // Astron. Astrophys., 2013. – Vol. 557, id.A24. – 14 p.
22. Zemanek E. N. Splitting of some spectral lines of FeI in magnetic field / E. N. Zemanek, A. P. Stefanov // Vestnik Kiev Univ., Seria Astronomii, 1976. – Vol. 18. – P. 20–36.

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