Abstract Details
| Name: SUDHEER MISHRA Affiliation: IIT(BHU), Varanasi Conference ID: ASI2019_188 Title : On the Development of MRT Unstable Plumes in An Eruptive Prominence Authors and Co-Authors : Sudheer K. Mishra, A.K. Srivastava Abstract Type : Poster Abstract Category : Sun and the Solar System Abstract : We analyze the observations from the Solar Dynamic Observatory (SDO) onboard the Atmospheric Imaging Assembly (AIA) of an eruptive prominence in the lower corona on 18th November 2014. This eruptive prominence consists of self-similar magnetic Rayleigh-Taylor unstable plumes. We observed that a cavity has been developed within the prominence which grew vertically first. The perturbations have developed on the boundary of the cavity and the first MRT unstable plume is initiated at 05:15 UT on the top of the cavity. It passes through the overlying prominence along with strong upflows. Additional perturbations have been developed on the boundary of the cavity, which further trigger an another MRT unstable plume like structure. The self-similar plume formation shows the linear, and in later phase the single mode MRT plume formation exhibits the non-linear phase of MRT instability as it is converted into the mushroom like structure in it’s final stage of the development. We have analyzed the temporal and spatial evolution of these MRT unstable plumes and estimated the observational growth rate of the MRT instability which is found to be 1.05×10−3 and 1.11×10−3 s −1. The Differential Emission Measurement (DEM) technique has been used to estimate the density within the bright plume regions and dark cavity regions lying below. The separation between two consecutive plumes gives the characteristic wavelength of MRT instability. The estimated theoretical growth rate 3.08×10−3 s−1 is found in good agreement with the measured observational growth rate. |