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• W3104294533 endingPage "82" @default.
• W3104294533 startingPage "82" @default.
• W3104294533 abstract "Helical magnetic flux rope (MFR) is a fundamental structure of coronal mass ejections (CMEs) and has been discovered recently to exist as a sigmoidal channel structure prior to its eruption in the EUV high-temperature passbands of the Atmospheric Imaging Assembly (AIA). However, when and where the MFR is built up are still elusive. In this paper, we investigate two MFRs (MFR1 and MFR2) in detail, whose eruptions produced two energetic solar flares and CMEs on 2014 April 18 and 2014 September 10, respectively. The AIA EUV images reveal that for a long time prior to their eruption, both MFR1 and MFR2 are under formation, which is probably through magnetic reconnection between two groups of sheared arcades driven by the shearing and converging flows in the photosphere near the polarity inversion line. At the footpoints of the MFR1, the Interface Region Imaging Spectrograph Si iv, C ii, and Mg ii lines exhibit weak to moderate redshifts and a non-thermal broadening in the pre-flare phase. However, a relatively large blueshift and an extremely strong non-thermal broadening are found at the formation site of the MFR2. These spectral features consolidate the proposition that the reconnection plays an important role in the formation of MFRs. For the MFR1, the reconnection outflow may propagate along its legs, penetrating into the transition region and the chromosphere at the footpoints. For the MFR2, the reconnection probably takes place in the lower atmosphere and results in the strong blueshift and non-thermal broadening for the Mg ii, C ii, and Si iv lines." @default.
• W3104294533 created "2020-11-23" @default.
• W3104294533 creator A5000460407 @default.
• W3104294533 creator A5032178818 @default.
• W3104294533 creator A5040109851 @default.
• W3104294533 date "2015-05-05" @default.
• W3104294533 modified "2023-09-26" @default.
• W3104294533 title "IMAGING AND SPECTROSCOPIC DIAGNOSTICS ON THE FORMATION OF TWO MAGNETIC FLUX ROPES REVEALED BY<i>SDO</i>/AIA AND<i>IRIS</i>" @default.
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• W3104294533 doi "https://doi.org/10.1088/0004-637x/804/2/82" @default.
• W3104294533 hasPublicationYear "2015" @default.
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