Observational Evidences for Extremely Strong Magnetic Fields in Solar Flares

• 作者: Vsevolod Gryhorovych Lozitsky
• 来源期刊: 天文学与天体物理学国际期刊(英文)
• 学科: 医学
• 关键词: SUN SOLAR FLARES SMALL-SCALE Magnetic FIELDS Superstrong FIELDS
• 年，卷（期）: 2011,（3）
• 页码范围: 147-154
• 页数: 8页
• 分类号: R73

摘要

New observational data related to the X1.1/2N solar flare of 17 July 2004 were investigated and compared with some old data for other powerful flares and non-flare regions. Observations were carried out with the Echelle spectrograph of the Kyiv University Astronomical Observatory. The Stokes I ± V profiles of several metallic lines with different effective Lande factors geff have been analyzed including the FeI 5434.5 line with very low magnetic sensitivity (geff = –0.014). The obvious evidences of the emissive Zeeman effect were found as in lines with great and middle Lande factors as in FeI 5434.5 line. On the basis of all analyzed data one can conclude that upper magnetic field limit in flares can reach 70 - 90 kG, i.e. about more order higher than the well-known magnetic fields in great sunspots. The possible physical nature of such superstrong fields is discussed.