Abstract Details
| Name: Nishtha Sachdeva Affiliation: Indian Institute of Science Education and Research, Pune Conference ID: ASI2018_416 Title : Proxies for CME acceleration Authors and Co-Authors : Prasad Subramanian Abstract Type : Contributed Talk Abstract Category : Sun and the Solar System Abstract : Sachdeva et al. 2017 showed that the accelerating Lorentz forces peak between 1.65-2.45 solar radii for a sample set of CMEs with speeds ranging between 47-2500 km/s. Since CMEs in white light can be observed only above 2-3 solar radii, which is typically beyond the heights at which the Lorentz forces peak, it leads to an uncertainty in deriving the CME launch speeds. An alternate approach could be estimating these speeds using the X-ray or radio emissions. Using data from LASCO and STEREO coronagraphs for a diverse CME sample and fitting it using the Graduated Cylindrical Shell model technique, we derive the Lorentz force profiles for each event based on the Torus Instability model. We investigate multiwavelength data to find which profile can be used as a good approximation for the observationally derived force profile. This can be used as a preliminary and immediate method of predicting the CME arrival time at the Earth based on the microwave or soft X-ray profiles. |