경희대학교 BK21

 

아래와 같이 세미나를 진행하오니
관심있는 분들의 많은 참여를 바랍니다.
-------------------- 아 래 --------------------
● 날짜 : 2017년 09월 26일 (화요일)
● 시간 : 16시 30분
● 장소 : 천문대 영상실
● 강사 : Ramesh Chandra (Kumaun University)
 
Title : Two-Step Filament eruptions
 
Abstract :
We present here a filament eruption during 2014 March 14—15. The filament was located in NOAA
AR 12297 and erupted in two steps. 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 Hα data from the Global Oscillation Network
Group (GONG) telescope. 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 and the largest geomagnetic storm of
Solar Cycle 24. The decay index is calculated to understand this two-step eruption. The two step
filament eruption was due to the presence of successive instability–stability–instability zones.