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Chandra Ramesh, Filippov Boris, Joshi R., Schmieder Brigitte

Two-Step Filament Eruption During 14 - 15 March 2015

Solar Physics, 2017, vol. 292

Référence DOI : 10.1007/s11207-017-1104-5
Référence ADS : 2017SoPh..292...81C

Résumé :

We present here an interesting two-step filament eruption during 14 - 15 March 2015. The filament was located in NOAA AR 12297 and associated with a halo Coronal Mass Ejection (CME). We use observations from the Atmospheric Imaging Assembly (AIA) and Heliospheric Magnetic Imager (HMI) instruments onboard the Solar Dynamics Observatory (SDO), and from the Solar and Heliospheric Observatory (SOHO) Large Angle and Spectrometric Coronagraph (LASCO). We also use Halpha data from the Global Oscillation Network Group (GONG) telescope and the Kanzelhoehe Solar Observatory. The filament shows a first step eruption on 14 March 2015 and it stops its rise at a projected altitude {≈} 125 Mm on the solar disk. It remains at this height for {≈} 12 hrs. Finally it erupts on 15 March 2015 and produces a halo CME. We also find jet activity in the active region during both days, which could help the filament de-stabilization and eruption. The decay index is calculated to understand this two-step eruption. The eruption could be due to the presence of successive instability-stability-instability zones as the filament is rising.

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