Estimating arrival time of 10 October 2010 CME using STEREO/SECCHI and in-situ observations

Wageesh Mishra* and Nandita Srivastava
Udaipur Solar Observatory and Physical Research Laboratory, Dewali, Bari Road, Udaipur, India

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The prediction of arrival time of Coronal Mass Ejections (CMEs) at the Earth is one of the prime objectives of solar-terrestrial physicist. In the present work, we applied the tie-pointing method on STEREO/SECCHI coronagraph (COR2) images to obtain the true 3D coordinates of CME feature of 10 October 2010 and estimated its arrival time at 1AU. Further, we tracked this CME in the interplanetary medium using COR2 and HI images from SECCHI instruments and obtained its true kinematics using geometric triangulation technique. In order to estimate the arrival time of the CME, the drag based model is used for the remaining distance where CME could not be tracked with good accuracy in HI field of view. We identified the interplanetary counterpart of 10 October 2010 CME in in-situ data and marked its arrival time which is then compared with the arrival time estimated using remote sensing observations. It is shown that a better prediction of arrival time and transit velocity of CME at 1AU is possible by implementing geometric triangulation technique on HI observations combined with drag based model than using only SECCHI coronagraph images.

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Keywords : ICME – STEREO – heliospheric imager – solar wind